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Journal articles on the topic 'Linear response history analysis'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 February 2022

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1

Kubic, Charles. "Evaluation of Dynamic Analysis Methods for Seismic Analysis of Drydocks." Marine Technology Society Journal 43, no. 1 (March 1, 2009): 73–92. http://dx.doi.org/10.4031/mtsj.43.1.12.

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AbstractThree numerical methods are used to model the structural response of Bremerton drydock no. 6 to the 2001 Nisqually earthquake. The models considered include: (1) a numerical linear-elastic soil response model, (2) a numerical non-linear time-history response model, and (3) a non-linear finite element model. The results of the models are compared to the observed drydock response and each other in order to determine their effectiveness in modeling drydock structures. The research demonstrated that the non-linear finite element program PLAXIS is suitable for the seismic analysis of drydocks. In addition, the research showed that the existing United States Army Corps of Engineers program CorpsWallROTATE is not suited for the dynamic analysis of drydocks; while a method developed by Wood in 1973 could be further developed to be used as a linear approximation of the drydock’s time-history seismic response. The research is presented to assist in the development of comprehensive seismic drydock design standards.
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2

Abbiati, Giuseppe, and Božidar Stojadinović. "A procedure for the approximated response history analysis of linear thermoelastic structures." Journal of Thermal Stresses 40, no. 7 (February 10, 2017): 879–98. http://dx.doi.org/10.1080/01495739.2017.1283972.

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3

Brinissat, Marame, Rajmund Kuti, and Zouhir Louhibi. "Dynamic seismic analysis of bridge using response spectrum and time history methods." Acta Technica Jaurinensis 14, no. 2 (May 26, 2021): 171–85. http://dx.doi.org/10.14513/actatechjaur.00595.

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Dynamic analysis is very important to better understand the performance of structural elements of a bridge. For this purpose, a seismic analysis of an Algerian highway bridge designed with the new Algerian seismic bridge regulation (RPOA -2008) was carried out using linear and nonlinear analyses. Therefore, response spectrum, time history analyses were performed to evaluate the seismic responses of the designed bridge. The performance of the designed bridge is assessed using 10 ground motion records. The proposed methodology allows an efficient comparison of the seismic response of the bridge in terms of base shear forces, bending moment and displacements. Finally, the paper concludes with a discussion of the specific outcomes.
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4

Abd-Elhamed, Ayman Mohammed, and Sayed Mahmoud. "Linear and Nonlinear Dynamic Analysis of Masonry Infill RC Framed Buildings." Civil Engineering Journal 3, no. 10 (November 4, 2017): 881. http://dx.doi.org/10.28991/cej-030922.

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This paper aimed to investigate the seismic response of reinforced concrete (RC) frame buildings under linear and non-linear dynamic analysis. Different building models as bare frame and fully masonry infill frame have been developed for performing the analysis. In order to investigate the effect of irregular distributions of masonry infill walls in elevation on the seismic response behavior, an infill frame model with soft story has also been developed. The linear response spectrum (RS) dynamic analysis and the nonlinear time-history (TH) analysis methods are employed. Moreover, the induced energies in terms of input, potential and kinetic are also obtained from the TH analysis. Moreover, the interaction between infill walls and frames leads to considerable change in the induced responses comparable with the bare model.
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5

Saatcioglu, Murat, and JagMohan Humar. "Dynamic analysis of buildings for earthquake-resistant design." Canadian Journal of Civil Engineering 30, no. 2 (April 1, 2003): 338–59. http://dx.doi.org/10.1139/l02-108.

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The proposed 2005 edition of the National Building Code of Canada specifies dynamic analysis as the preferred method for computing seismic design forces and deflections, while maintaining the equivalent static force method for areas of low seismicity and for buildings with certain height limitations. Dynamic analysis procedures are categorized as either linear (elastic) dynamic analysis, consisting of the elastic modal response spectrum method or the numerical integration linear time history method, or nonlinear (inelastic) response history analysis. While both linear and nonlinear analyses require careful analytical modelling, the latter requires additional considerations for proper simulation of hysteretic response and necessitates a special study that involves detailed review of design and supporting analyses by an independent team of engineers. The paper provides an overview of dynamic analysis procedures for use in seismic design, with discussions on mathematical modelling of structures, structural elements, and hysteretic response. A discussion of the determination of structural period to be used in association with the equivalent static force method is presented.Key words: dynamic analysis, earthquake engineering, elastic analysis, fundamental period, hysteretic modelling, inelastic analysis, National Building Code of Canada, seismic design, structural analysis, structural design.
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6

Abbas, Rafaa M., and Ahmed Sada Dheeb. "Deterministic Wind Load Dynamic Analysis of High Rise Steel Buildings Including P-Delta Effects." Association of Arab Universities Journal of Engineering Sciences 26, no. 1 (March 31, 2019): 129–35. http://dx.doi.org/10.33261/jaaru.2019.26.1.017.

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This study concerns with the investigation of the second-order geometric nonlinearity effects of P-Delta analysis on the dynamic response of high rise steel buildings due to deterministic wind load. Linear and nonlinear time history analyses were conducted to analyze different tall steel building models adopted in the study. Five steel building models ranging from 10 to 50 stories were numerically modeled and analyzed using finite element code ETABS (version 16.0.3). Deterministic dynamic wind load per ASCE 7-10 is applied to the buildings as a main lateral load. Comparative study between linear and nonlinear time history analyses reveals that nonlinear time history analysis including P-Delta effects displayed larger values of buildings lateral sway than those of linear time history analysis. Generally, including P-Delta effect in the nonlinear analysis increases the flexibility of the building structure, and thus increases response peak values and that peak values occur at a longer time periods indicating lesser response oscillations. The study recommends that P-Delta effect need to be addressed by any dynamic wind analysis for tall steel buildings with 20 story height or more.
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7

Ahmed, Zuber, and Esar Ahmed. "Non-Linear Analysis of Cable Stayed Bridges." International Journal of Emerging Research in Management and Technology 6, no. 9 (June 24, 2018): 36. http://dx.doi.org/10.23956/ijermt.v6i9.82.

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The concept of cable-stayed bridges dates back to the seventeenth century. Due to their aesthetic appearance, efficient utilization of material, and availability of new construction technologies, cable-stayed bridges have gained much popularity in the last few decades. After successful construction of the Sutong Bridge, a number of bridges of this type have been proposed and are under construction, which calls for extensive research work in this field. Nowadays, very long span cable-stayed bridges are being built and the ambition is to further increase the span length using shallower and slender girders. In order to achieve this, accurate procedures need to be developed which can lead to a thorough understanding and a realistic prediction of the bridge’s structural response under different load conditions.In the present study, an attempt has been made to analyze the seismic response of cable stayed bridges with single pylon and two equal side spans. This study has made an effort to analyze the effect of both static and dynamic loadings on cable-stayed bridges and corresponding response of the bridge with variations in span length, pylon height and pylon shape. Comparison of static analysis results have been made for different configuration of bridges - their mode shapes, time period, frequency, pylon top deflection, maximum deck deflection; and longitudinal reaction, lateral reaction and longitudinal moment at pylon bottom. Time history analysis results have been investigated for different configuration of bridges under the effects of three earthquakes response spectrum (Bhuj, El Centro and Uttarkashi) - axial forces in stay cables, deck deflections and stress diagrams at maximum peak ground acceleration of the above mentioned earthquakes.
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8

Xiao, Yun, Jun Qing Lei, and Zhong San Li. "Seismic Response Analysis of Railway Frame Piers." Key Engineering Materials 517 (June 2012): 824–31. http://dx.doi.org/10.4028/www.scientific.net/kem.517.824.

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By response spectrum method, superposition method based elastic time-history analysis and nonlinear time-history analysis of Newmark-β based linear increasing acceleration method, the finite element models of frame piers 21#~29# of the Ziya River Bridge on Tianjin to Baoding railway are established, and an assistant program code is generated to analyze seismic response of the frame pier. Results indicate that the vibration modes of frame piers are scattered. Only a few modes would be aroused in a narrow band spectrum. And the seismic response obtained by the response spectrum method is generally 10%~20% smaller than which obtained by the elastic time-history analysis. Under seismic excitations along the longitudinal direction, the ratio of displacement difference between two columns to the maximum value is generally liner increased with the increasing of the girder deviation from the centre of the pier beam. And the plastic hinge yielding would occur both at the bottom and the top of pier columns under excitations of the transversal direction. As a result, taking more than 30 vibration modes into account is suggested in a seismic response analysis or design calculation for frame piers. A time-history analysis is recommended as well. The evaluation of earthquake resistant capability of the transversal direction should consider both the bottom and top of the columns, and the anti-seismic capability design of the longitudinal direction is one of the key points for frame piers in the ductility design.
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9

Ryan, Keri L., and Anil K. Chopra. "Estimating the seismic displacement of friction pendulum isolators based on non-linear response history analysis." Earthquake Engineering & Structural Dynamics 33, no. 3 (February 11, 2004): 359–73. http://dx.doi.org/10.1002/eqe.355.

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10

Wilkinson, S. M., and R. A. Hiley. "A non-linear response history model for the seismic analysis of high-rise framed buildings." Computers & Structures 84, no. 5-6 (January 2006): 318–29. http://dx.doi.org/10.1016/j.compstruc.2005.09.021.

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11

Jiang, Yong, Jian Zhu, Yan Bin Zhang, and Xin Zhang. "Geometrical Non-Linear Analysis of Truss Structures under 3D Seismic Loads." Applied Mechanics and Materials 501-504 (January 2014): 1587–91. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.1587.

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The seismic response of space structures has been widely studied in the past few years. It has been shown that space structures behave well under seismic loading. However there has been little attention given to the effects of geometrical non-linearity on the seismic response. In this paper, a double-layer truss model was created by finite element analysis program-Lusas. The analysis process took into account of geometrical non-linearity and a 3D seismic loading obtained from a real earthquake. Time-history method was used to investigate the axial forces and displacements of critical members of the model during the earthquake. The seismic behavior of the model and the effect of non-linearity were finally discussed for further applications and studies.
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12

Wu, Xun, and Yong Lan Zhang. "Seismic Analysis of High Pier Three-Span Continuous Bridge." Applied Mechanics and Materials 744-746 (March 2015): 890–93. http://dx.doi.org/10.4028/www.scientific.net/amm.744-746.890.

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In this paper, SAP2000 and ANSYS software are used to modeling and analysis athree-span continuous beam bridge with high piers case study.By using differentbearing types and combinations to form different options, create two finiteelement models.Analysis dynamic characteristics ,elastic response spectra,linear time history and nonlinear time history .And focus on comparing dynamiccharacteristics of the earthquake response of the two programs .Running outputdata processing and comparison results show that the application of thedifferent parameters of the rational combination of rubber bearing basin bridgearrangement has better seismic performance.
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13

Chen, Jun Wu, and Liang Li. "Investigation on Dynamic Response of Steel Tower Structure under Time-History Wind Load." Applied Mechanics and Materials 166-169 (May 2012): 699–707. http://dx.doi.org/10.4028/www.scientific.net/amm.166-169.699.

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According to the Autoregressive Model in linear filter, the procedure, which was used to transform frequency domain to time domain, was programmed to simulate time history wind load with spatial correlation at different height of the tower by dint of numerical analysis software MATLAB. And then in virtue of the finite element software SAP2000, the nonlinear dynamic analysis to the steel structural tower under the time history wind load was made to gain the time history displacement, time history velocity and time history acceleration. Finally the comparison between static wind load displacement response and time history wind load displacement response was made to analyze the error of the static wind analysis.
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14

Čada, Petr, and Jiří Máca. "COMPARISON OF METHODS USED FOR SEISMIC ANALYSIS OF STRUCTURES." Acta Polytechnica CTU Proceedings 13 (November 13, 2017): 20. http://dx.doi.org/10.14311/app.2017.13.0020.

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This paper investigates effects of the seismic load to a structure. The article describes main methods of the definition and practical application of the seismic load based on the Standard Eurocode 8. There was made a comparison of all methods using the same structure. A simple two-storeyed concrete 2D-frame with fixed joints was chosen. A one another model with rigid beams for some calculations was defined. The second model can be used for hand-calculations as a cantilever with two masses. The paper describes main dynamic properties of the chosen structure. Seismic load was defined by lateral force method, modal response spectrum, non-linear time-history analysis and pushover analysis. The time-history analysis is represented by accelerograms. There were made linear and non-linear calculations.
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15

Wang, Jun Jun, and Lu Lu Yi. "Seven Mega Floor MSCSS Modal Analysis." Applied Mechanics and Materials 353-356 (August 2013): 2210–15. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.2210.

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Modal analysis is also known as dynamic analysis for mode-superposition method. In the seismic response analysis of linear structural systems, it is one of the most commonly used and the most effective ways. Through the modal analysis of building structure, we can get some basic performance parameters of the structure. These parameters can help us make qualitative judgments for the respond of a structure first, and can help us judge whether they meet demands for conceptual design. Modal analysis is also the basis of other dynamic response analysis, including dynamic time history analysis and response spectrum analysis.
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16

Kostinakis, K. G., A. M. Athanatopoulou, and V. S. Tsiggelis. "Effectiveness of percentage combination rules for maximum response calculation within the context of linear time history analysis." Engineering Structures 56 (November 2013): 36–45. http://dx.doi.org/10.1016/j.engstruct.2013.04.012.

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17

Jia, Hong Yu, Shi Xiong Zheng, Ming Qiang Xia, and Lei Yang. "Analysis of Linear Viscous Damper Parameters and Shock Absorption for Long-Span Cable-Stayed Bridge." Advanced Materials Research 243-249 (May 2011): 3858–62. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.3858.

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The seismic behavior study of Fengdu Bridge will be conducted on a parameter of damping coefficient C of linear viscous dampers through linear dynamic time-history analysis. Simultaneously, the results are compared with the seismic response without viscous dampers. The parameter sensitivity study indicates that setting damper in longitudinal direction of bridge can reduce the relative displacement of key positions and the response of the bridge, the beneficial effect of the isolation in the longitudinal direction, but important amplification occurs in the vertical direction for relatively high frequency components. Moreover, the reference of application of linear viscous dampers will be provided for similar projects.
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18

Klampfl, Stefan, Stephen V. David, Pingbo Yin, Shihab A. Shamma, and Wolfgang Maass. "A quantitative analysis of information about past and present stimuli encoded by spikes of A1 neurons." Journal of Neurophysiology 108, no. 5 (September 1, 2012): 1366–80. http://dx.doi.org/10.1152/jn.00935.2011.

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To process the rich temporal structure of their acoustic environment, organisms have to integrate information over time into an appropriate neural response. Previous studies have addressed the modulation of responses of auditory neurons to a current sound in dependence of the immediate stimulation history, but a quantitative analysis of this important computational process has been missing. In this study, we analyzed temporal integration of information in the spike output of 122 single neurons in primary auditory cortex (A1) of four awake ferrets in response to random tone sequences. We quantified the information contained in the responses about both current and preceding sounds in two ways: by estimating directly the mutual information between stimulus and response, and by training linear classifiers to decode information about the stimulus from the neural response. We found that 1) many neurons conveyed a significant amount of information not only about the current tone but also simultaneously about the previous tone, 2) the neural response to tone sequences was a nonlinear combination of responses to the tones in isolation, and 3) nevertheless, much of the information about current and previous tones could be extracted by linear decoders. Furthermore, our analysis of these experimental data shows that methods from information theory and the application of standard machine learning methods for extracting specific information yield quite similar results.
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19

Yang, Hai Xu, Tong Shen, and Jian Gang Yao. "Study on Earthquake Response Analysis of Reinforced Concrete Masonry Structure." Advanced Materials Research 295-297 (July 2011): 244–48. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.244.

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According to the analysis of a six-story reinforced concrete masonry building model with the methods of nonlinear time history analysis, the seismic performance of structure has been studied in this paper. The interstory shear-deformation and stiffness of linear elastic model is established. The availability of the analysis model, hysteretic model and relevant parameters adopted and the computation program developed are verified. The longitudinal deformation of structure is bigger than the lateral deformation under different earthquake waves, from this it can be showed that longitudinal seismic performance is smaller than lateral wall; for seven-story concrete block building with core-and tie-columns, the requirement of the seismic fortification intensity can be met. The analysis of this paper provides a reference for reinforced concrete block buildings.
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20

Zhao, Yu Liang, and Zhao Dong Xu. "Elastic-Plastic Time History Analysis of MR Damping Structure Based on LQG Algorithm." Applied Mechanics and Materials 858 (November 2016): 145–50. http://dx.doi.org/10.4028/www.scientific.net/amm.858.145.

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This paper discussed an elastic-plastic time-history analysis on a structure with MR dampers based on member model, in which the elastoplastic member of the structure is assumed to be single component model and simulated by threefold line stiffness retrograde model. In order to obtain better control effect, Linear Quadratic Gaussian (LQG) control algorithm is used to calculate the optimal control force, and Hrovat boundary optimal control strategy is used to describe the adjustable damping force range of MR damper. The effectiveness of the MR damper based on LQG algorithm to control the response of the structure was investigated. The results from numerical simulations demonstrate that LQG algorithm can effectively improve the response of the structure against seismic excitations only with acceleration feedback.
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21

Zhou, Guo Liang, and Hui Tang. "Modal Analysis and Seismic Response Evaluation on Structures of Advanced PWR." Advanced Materials Research 838-841 (November 2013): 1471–75. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.1471.

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To evaluate the earthquake resistant behavior of the nuclear island buildings of new generation PWR, in this study we formed the three dimensional finite element model of nuclear island structures ,which incluse shield building, the auxiliary building, the containment vessel, and the containment internal structures. Modal analysis was performed to to reveal the structural dynamic characteristics.And with the auumption of hard bedrock support media ,the dynamic response nanalysis of the nuclear structures under earthquake was conducted,respectively with response spectrum method and time history method.It shows that the seimic response of the strucures conform with the design level.Under the input excitations of SSE(safe shutdown earthquake) level, the iner forces and deforamtions can be well controlled in linear elasticity.
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22

Yongbing, FENG. "Seismic Performance Analysis of Continuous Rigid Frame Bridges in Expressway under Non-linear Interactions of Soil-Piles." MATEC Web of Conferences 175 (2018): 04037. http://dx.doi.org/10.1051/matecconf/201817504037.

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Taking the three-span pre-stressed concrete continuous rigid frame bridge as an engineering example, MIDAS Civil was utilized to establish a spatial finite element model and the interaction between pile foundation and the soil was simulated by equivalent soil spring. In addition to analyzing shearing force, bending moment and stress of the primary beam's characteristic section under different loads, a response spectrum method and time history analysis were adopted to conduct seismic response analysis respectively. In this case, performance of the bridge could be comprehensively evaluated. Relevant analysis results indicate that internal force of the large-span pre-stressed concrete continuous rigid frame bridge is mainly induced by gravity and pre-stress of the structure; section stresses of the primary beam satisfy the corresponding specification and structural safety can be achieved in a state of operation. Moreover, computed results obtained by the response spectrum method is more conservative than those of the time history analysis. In terms of continuous rigid frame bridge, different seismic directions should be taken into consideration during structural seismic analysis at different construction stages.
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23

Zhao, Nan, and Yang Jiang. "Three Dimensional Seismic Response Analyses on the Isolated Spatial Beam String Structure." Advanced Materials Research 255-260 (May 2011): 2526–31. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.2526.

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Three dimensional seismic responses of an isolated spatial beam string structure are studied by applying the non-linear finite element theory. The filtering effect of the main structure, which amplifies the ground input, is investigated. The results indicate that the vertical rare earthquake has great influence on the isolated spatial beam string structure, and stresses of cables, frames and slab shells under vertical rare earthquake are all much greater than that under gravity load. Results of non-linear time history analysis show that elements’ stresses are in elastic stage, thus the spatial beam string structure with isolation keeps safe under rare earthquake.
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24

Sun, Zhi Li, Peng Fei Chen, Feng He Zhang, and Ya Dan Huang. "Reliability Sensitivity Analysis of Sliding Bearing Based on Virtual Simulation Technology." Applied Mechanics and Materials 16-19 (October 2009): 334–39. http://dx.doi.org/10.4028/www.scientific.net/amm.16-19.334.

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As a non-linear finite element analysis software ANSYS/LS-DYNA is used to carry out virtual reliability test in transmission mechanism of reciprocating compressor and response surface method is used to analyze reliability and sensitivity of sliding bearing according to testing data. This paper uses ANSYS to preprocess testing models of virtual prototype and put out the K file; designs sample points of random variables based on central composite method and modifies the K files to carry out random sampling of prototype and uses LS-DYNA970 to solve the submitted K files repeatedly; plots relationship curves of output responses and time history and gets a group of sample points of structure response with post-processing results of LS-PREPOST. Lastly this paper uses response surface method to build limit state equation and analyze reliability and sensitivity of sliding bearing, and provides theoretical basis for design of bearing.
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25

HER, SHIUH-CHUAN, and CHING-CHUAN LIAO. "ANALYSIS OF ELASTIC IMPACT ON THIN SHELL STRUCTURES." International Journal of Modern Physics B 22, no. 09n11 (April 30, 2008): 1349–54. http://dx.doi.org/10.1142/s0217979208046761.

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In this paper, a solution method for the response of a thin shell structure subjected to low velocity impact by a sphere is presented. The governing equation of the impact process is obtained by simultaneously solving the equations of motions for the sphere and shell. The derivation is based on the explicit expression of the displacement of the mid-surface of the shell under a single impulse load acting normal to apex of the shell. Incorporating the theory of convolution and Hertz contact law, a non-linear integro-differential equation in terms of the indentation of the contact, for the impact process is derived. The non-linear integro-differential equation is solved by the numerical scheme of Runge-Kutta method to obtain the time history of the contact force at the impact point of the shell. The contact force is then applied on the apex of the shell, the dynamic responses of the shell including the displacement and stress are obtained by the finite element method. The results are validated with the experimental test and numerical calculation published in the literatures. The effects of the radius and velocity of the impactor on the impact response is investigated through parametric study.
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26

Zhang, Zhi Qiang, Yan Chen, Guan Xing Su, and Xing Gang Zhu. "Analysis of Wind-Induced Vibration Control of Long-Span Space Structure." Advanced Materials Research 255-260 (May 2011): 1204–8. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.1204.

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Based on improved linear regression filter method presented by Iwatani and wind tunnel test data, the program simulated 3-D time history of fluctuating wind pressure of Fuzhou Strait International Conference and Exhibition Center considering spatial correlation of wind loads, which is consistent with the object power spectrum .The simulation result is used in nodes of the structure to analyze response of wind-induced vibration. Analytical results show it has the maximum displacement response in 0° wind direction .Due to the installation of TMD, node displacement response of roof truss is reduced from 44.14mm to 33.16mm, with best reduction 26.67%.
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27

Wang, Tian Li, Qing Ning Li, and Hai Jun Yin. "Research on the Seismic Response Characteristic of a Curved Ramp Bridge." Advanced Materials Research 243-249 (May 2011): 3889–92. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.3889.

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In order to analyze seismic response of the curved ramp bridge, this paper selected a single curved ramp bridge in a multilevel junction system as its research object. Considering the piers, beams, bearings and expansion joints simulation, it respectively built the calculating models for a curved ramp bridge and a corresponding linear one. Using nonlinear time history analysis, the paper contrasts seismic response of the curved ramp bridge with that of the linear one in several different seismic inputs. Finally the seismic response characteristic of a curved ramp bridge is put forward.
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28

Roe, Gerard H., and Marcia B. Baker. "Glacier response to climate perturbations: an accurate linear geometric model." Journal of Glaciology 60, no. 222 (2014): 670–84. http://dx.doi.org/10.3189/2014jog14j016.

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AbstractIn order to understand the fundamental parameters governing glacier advance and retreat, and also the spectral properties of fluctuations in glacier length in response to noisy weather, we examine outputs of a numerical flowline model solving the shallow-ice equations with sliding. The numerical results reveal a surprising simplicity: the time evolution and spectral shape of glacier excursions depend on a single parameter, a time constant determined by the geometrical properties of the glacier. Furthermore, the numerical results reveal that perturbations in mass balance over the glacier surface set in motion a sequence of events that can be roughly described as occurring in three overlapping stages: (1) changes in interior thickness drive (2) changes in terminus flux, which in turn drive (3) changes in glacier length. A simple, third-order linear differential equation, which extends previous models in the literature, successfully captures these important features of the glacier flow. This three-stage linear model is readily invertible to recover climate history. It provides clear physical insight and analytical expressions for some important metrics of glacier behavior, such as variance, sensitivity and excursion probabilities. Finally, it facilitates uncertainty analysis. The linear model can also be adapted for arbitrary catchment geometry, and is applied to Nigardsbreen, Norway.
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29

Kartal, M. E. "Three-dimensional earthquake analysis of roller-compacted concrete dams." Natural Hazards and Earth System Sciences 12, no. 7 (July 24, 2012): 2369–88. http://dx.doi.org/10.5194/nhess-12-2369-2012.

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Abstract. Ground motion effect on a roller-compacted concrete (RCC) dams in the earthquake zone should be taken into account for the most critical conditions. This study presents three-dimensional earthquake response of a RCC dam considering geometrical non-linearity. Besides, material and connection non-linearity are also taken into consideration in the time-history analyses. Bilinear and multilinear kinematic hardening material models are utilized in the materially non-linear analyses for concrete and foundation rock respectively. The contraction joints inside the dam blocks and dam–foundation–reservoir interaction are modeled by the contact elements. The hydrostatic and hydrodynamic pressures of the reservoir water are modeled with the fluid finite elements based on the Lagrangian approach. The gravity and hydrostatic pressure effects are employed as initial condition before the strong ground motion. In the earthquake analyses, viscous dampers are defined in the finite element model to represent infinite boundary conditions. According to numerical solutions, horizontal displacements increase under hydrodynamic pressure. Besides, those also increase in the materially non-linear analyses of the dam. In addition, while the principle stress components by the hydrodynamic pressure effect the reservoir water, those decrease in the materially non-linear time-history analyses.
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30

Ramirez, Oscar M., Michael C. Constantinou, Juan D. Gomez, Andrew S. Whittaker, and Christis Z. Chrysostomou. "Evaluation of Simplified Methods of Analysis of Yielding Structures with Damping Systems." Earthquake Spectra 18, no. 3 (August 2002): 501–30. http://dx.doi.org/10.1193/1.1509763.

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The 2000 NEHRP Provisions include simplified methods of analysis of inelastic buildings equipped with linear viscous, nonlinear viscous, and hysteretic damping devices. These methods are based in part on the data presented in the paper. Nonlinear response-history analysis was used to validate the methods. The derivation of the 2000 NEHRP simplified methods for calculating the maximum acceleration and maximum velocity in damped framing systems are presented. These simplified methods produce exact or conservative estimates of peak displacement and peak acceleration, and reasonable estimates of peak velocities. The estimated velocities are within 25% of the average values obtained from response-history analysis for a broad range of periods and damping ratios. Velocity correction factors are provided to calculate peak velocity given the pseudo-velocity.
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31

Ali, Barham H., Brwa A. Saeed, and Twana A. Hussein. "Time History Analysis of Frame Structure Systems by State-space Representation Method." Polytechnic Journal 10, no. 1 (June 30, 2020): 140–47. http://dx.doi.org/10.25156/ptj.v10n1y2020.pp140-147.

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This paper develops the state-space representation (SSR) in the field of seismic analysis of the building structures. Dynamic analysis of multi-degree-of-freedom structures involves the solution of second-order linear differential equations which they represent the equation of motion of the structure. In this paper, a SSR was formulated to replace differential equation with two coupled first-order linear differential equations. The objectives of this study are as follows: (i) To implement the SSR as a powerful tool in dynamic analysis of frame structures and (ii) to conduct a linear time history analysis for large structures subjected to ground acceleration and the seismic responses of the building were studied as well. The analysis was based on the assumption that the system is elastic linear time-invariant system and material nonlinearity is not considered. The 1940 El-Centro earthquake time history record has been used in the study. There are many effective traditional methods which can be used for carrying out linear dynamic analysis of the structures, however, this paper introduces a state-space model as an alternative approach to perform this analysis. The advantage of this method, it works properly with MATLAB software, gives explicit result for time-invariant systems, applied to multi-input and multi-output control systems, solve the equation of motion for complicated dynamic problems.
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32

Wang, Tian Li, and Qing Ning Li. "Research on Pounding Response at Expansion Joint in the Linear Bridge and the Curved Bridge under Earthquake." Advanced Materials Research 255-260 (May 2011): 2303–7. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.2303.

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Aiming at pounding damage at expansion joint in a bridge under earthquake, the paper builds space dynamic models of a curved bridge and a linear bridge with expansion joint. Using nonlinear time history analysis, the paper contrasts the difference of pounding response at expansion joint in the linear bridge and the curved bridge and gives their simulation result under eight types of seismic input. The result indicates that the pounding response at expansion joint of curved bridge is larger and more obvious than that of linear bridge, especially at abutment expansion joint.
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33

Chae, Yunbyeong, James M. Ricles, and Richard Sause. "Development of equivalent linear systems for single-degree-of-freedom structures with magneto-rheological dampers for seismic design application." Journal of Intelligent Material Systems and Structures 28, no. 19 (March 26, 2017): 2675–87. http://dx.doi.org/10.1177/1045389x17698240.

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Numerous studies have been conducted for magneto-rheological dampers, but the application of magneto-rheological dampers in seismic design is limited due to the lack of a systematical design procedure. In this article, a simplified analysis procedure is proposed to estimate the response of a single-degree-of-freedom structure with diagonal bracing and a magneto-rheological damper without performing the time history analysis. The proposed simplified analysis procedure is based on the equivalent linear system of a magneto-rheological damper. The equivalent damping ratio and the effective period of the single-degree-of-freedom system are determined from the loss factor and the effective stiffness of the magneto-rheological damper based on the quasi-static model. Design response spectrum is utilized to calculate the displacement of the single-degree-of-freedom system. The equivalent damping ratio and the effective stiffness of the single-degree-of-freedom system are dependent on the displacement of the system; thus, the proposed procedure is iterated until the displacement from the design response spectrum converges. The accuracy of the simplified analysis procedure is evaluated by comparing the estimated response from this procedure with the response from the time history analysis. The results show a good agreement between two methods, demonstrating the robustness of the proposed simplified analysis procedure.
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34

Devaraj, Deepa, R. Ramkrishnan, T. Prabu, Sreevalsa Kolathayar, and T. G. Sitharam. "Synthesis of Linear JTFA-Based Response Spectra for Structural Response and Seismic Reduction Measures for North-East India." Journal of Earthquake and Tsunami 14, no. 06 (August 8, 2020): 2050023. http://dx.doi.org/10.1142/s1793431120500232.

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North-East India (NEI) has a long history of devastating earthquakes due to the complicated tectonic setting of the region. A shortage of sufficient recorded time-histories from the region calls for a synthesis of accelerograms for dynamic analyses. In this study, a novel Joint Time-Frequency Analysis (JTFA) technique is adopted for the synthesis of accelerograms, considering the non-stationary behavior of earthquake waves. JTFA is used for analyzing the signals in a joint time and frequency domain to better understand its characteristics and synthesize signals without compromising its inherent characteristics like frequency content and amplitude. Synthetic accelerograms are developed using JTFA techniques for different magnitude and distance ranges between 5 to 6.8 and 0–480[Formula: see text]km and response spectra are developed. Synthesized generalized accelerograms and their response spectra are compared with actual signals in the same magnitude-distance ranges and were found to match. A comparison of the frequency contents of actual and synthetic signals was also carried out using Fourier Transforms and spectrograms (SPs) and was found to be in good agreement. Further, a comparative study of various earthquake reduction measures for NEI is carried out for a scenario earthquake using the synthesized data, and the best suitable structural input for the region is recommended.
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35

Her, Shiuh Chuan, and Ching Chun Liao. "Impact Analysis of Composite Laminate Shell Structures." Applied Mechanics and Materials 764-765 (May 2015): 1185–88. http://dx.doi.org/10.4028/www.scientific.net/amm.764-765.1185.

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In this investigation, the methodology for predicting the dynamic response of a composite laminate shell subjected to low velocity impact is presented. A non-linear integro-differential equation is derived and solved by the numerical scheme of Runge-Kutta method to obtain the time history of the contact force at the impact point of the shell. The contact force is then taken as external force acting on the apex of the shell and solved by the finite element method. The results are validated with the numerical calculation published in the literature.
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36

Zinco, Adamo, Fernando Fraternali, Gianmario Benzoni, and Enzo Martinelli. "On the Distribution in Height of Base Shear Forces in Linear Static Analysis of Base-Isolated Structures." Buildings 10, no. 11 (November 1, 2020): 197. http://dx.doi.org/10.3390/buildings10110197.

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Although base isolation is nowadays a well-established seismic-protection technique for both buildings and bridges, and several issues are still open and attract the interest of the research community. Among them, the formulation of computationally efficient and accurate analysis methods is a relevant aspect in structural design of seismic-isolated buildings. In fact, codes and guidelines currently in force in various parts of the world generally include the possibility for designers to utilize linear-elastic analysis methods based on equivalent linearization of the non-linear force-displacement response of isolators. This paper proposes a formula for defining the force distribution in height that should be considered in linear-static analyses to obtain a more accurate approximation of the actual structural response, supposedly simulated by means of non-linear time history analysis. To do that, it summarizes the results of a wide parametric analysis carried out on a batch of structures characterized by three different heights and various properties of base isolators. The reported results highlight that the equivalent static force distribution provided by both Italian and European codes tend to underestimate the actual seismic lateral forces acting on base-isolated buildings, whereas the inverted triangular distribution, proposed in various American codes and standards, is often conservative.
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37

Hamzah, Nur Hamizah, Fathoni Usman, and Mohd Yazee Mat Yatim. "Dynamic Response of Self-Supported Power Transmission Tower Subjected to Wind Action." International Journal of Engineering & Technology 7, no. 4.35 (November 30, 2018): 476. http://dx.doi.org/10.14419/ijet.v7i4.35.22866.

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A power transmission tower carries electrical transmission conductor at adequate distance from the ground. It must withstand all nature’s forces besides its self-weight. In structural analysis, natural frequency, mode shape and damping ratio are used to define the structural dynamic properties which relate to the basic structural features. This paper described the dynamic analysis including the modal and the time history analysis on each segment of the self-supported transmission tower to understand its dynamic responses subjected to wind action. The factors such as different height above ground, a different value of wind speed and different wind angle of attack were included in this study to see the influence of those factors towards dynamic response of the structure. The contribution of the wind towards the displacement of the structure is determined in this study by comparing the result obtained in a linear static analysis which considered the load combination without and with the presence of wind action. It was found that displacement using dynamic analysis is bigger than static linear analysis. The result illustrates that the studied factors gave a significant effect on the dynamic response of the structure and the findings indicate that dynamic analysis is vital in structural design.
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38

Parulekar, Y. M., G. R. Reddy, K. K. Vaze, and K. Muthumani. "Passive Control of Seismic Response of Piping Systems." Journal of Pressure Vessel Technology 128, no. 3 (August 30, 2005): 364–69. http://dx.doi.org/10.1115/1.2217969.

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Passive energy dissipating devices, such as elastoplastic dampers (EPDs) can be used for eliminating snubbers and reducing the response of piping systems subjected to seismic loads. Cantilever and three-dimensional piping systems were tested with and without EPD on shaker table. Using a finite element model of the piping systems, linear and nonlinear time-history analysis is carried out using Newmark’s time integration technique. Equivalent linearization technique, such as Caughey method, is used to evaluate the equivalent damping of the piping systems supported on elastoplastic damper. An iterative response spectrum method is used for evaluating response of the piping system using this equivalent damping. The analytical maximum response displacement obtained at the elastoplastic damper support for the two piping systems is compared with experimental values and time history analysis values. It has been concluded that the iterative response spectrum technique using Caughey equivalent damping is simple and results in reasonably acceptable response of the piping systems supported on EPD.
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39

Popescu, Florin Dumitru, Sorin Mihai Radu, Krzysztof Kotwica, Andrei Andraș, Ildiko Kertesz Brînaș, and Stela Dinescu. "Vibration analysis of a bucket wheel excavator boom using rayleigh’s damping model." New Trends in Production Engineering 2, no. 1 (October 1, 2019): 233–41. http://dx.doi.org/10.2478/ntpe-2019-0024.

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Abstract For the ERc 1400-30/7 type bucket wheel excavator (BWE) used in various Romanian open pit mines, a virtual model of the boom was constructed in SolidWorks. On this model, the variable in time forces acting during the excavation process were simulated, and the time history analysis (time response) was performed. This dynamic time response analysis was performed for excavation of homogenous material only, considering the damping as being of Rayleigh’s type, where the damping matrix is a linear combination of the mass and stiffness matrices. Based on the conducted analysis, the displacements of the boom during excavation were observed.
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40

Xianwen, Huang, Liu Shunqing, Sui Xiaolan, and Hu Yuan. "Earthquake response analysis of soil-rock slope based on distribution of rocks." MATEC Web of Conferences 175 (2018): 04010. http://dx.doi.org/10.1051/matecconf/201817504010.

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Soil-rock slope is a structure of slopes distributing widely in the world, but the calculation model of its stability is always set as uniform soil model under the influence of earthquake, and the effect of rock distribution on the slope can’t be considered comprehensively. Therefore, based on the method of finite element non-linear time-procedure, this paper analyses the acceleration response of slopes under the influence of earthquake with different rock distribution. Results show that the distribution of rocks have great influence on the accelerated response characteristic, and the main findings are as follows: (a) the accelerated time-history curve can filter the high frequency waves; (b) the free-surface has amplifying effect on seismic waves; (c) the acceleration response curves have different degrees of “biased”. Through above analysis, it’s expected to provide some reference for the stability analysis of soil-rock slope and reinforcement scheme under the influence of earthquake.
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41

Dai, L., Q. Han, and M. Dong. "Chaotic response of a Galerkin shell to constant load and periodic excitation." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 219, no. 1 (March 1, 2005): 61–73. http://dx.doi.org/10.1243/146441905x9953.

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This study intends to investigate the dynamic behaviour of a non-linear elastic shallow shell of large deflection subjected to constant boundary loading and harmonic lateral excitation. The general governing equation for the shell is established using the Galerkin Principle. Three types of dynamic equation of the shell are developed, corresponding to certain geometry and loading conditions. Melnikov functions are considered for each type. Non-linear responses of the shell to the loads are analysed theoretically. Centre points, saddle points, and homoclinic orbits are determined and analysed on the basis of the governing equations established. The critical conditions for chaos to occur are provided for the vibrations of the shell. Numerical analysis is also performed for the non-linear elastic shell. Chaotic and regular vibrations of the shell are analysed with presentations of time history plots, phase diagrams, and Poincaré maps.
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42

Bu, Guo Bin, Jian Cai, and Kang Ning Li. "Evaluation of N-M Model on Simulating Seismic Response of High-Rise SRC Structure." Applied Mechanics and Materials 477-478 (December 2013): 1060–63. http://dx.doi.org/10.4028/www.scientific.net/amm.477-478.1060.

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The axial load-biaxial bending moment interaction model (N-M model) is developed based on the metal plasticity theory, and its reliability in structural analysis is evaluated. Employing CANNY program, linear and nonlinear dynamic time history analysis is conducted to a 32-story SRC structure. The dynamic responses are compared between N-M model and fiber model cases. The results show that N-M model can simulate well the dynamic response of the high-rise hybrid structures. Besides, N-M model has clear mechanical concept and is much simpler compared to fiber model, and the computational efficiency can be greatly improved by using N-M model.
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43

Wirawan, Nugraha Bintang, and Siska Apriwelni. "Structural Failure Analysis of Building E ITERA Due to The Pounding Effect with Non-Linear Time History." JURNAL SAINTIS 20, no. 01 (April 29, 2020): 35–46. http://dx.doi.org/10.25299/saintis.2020.vol20(01).4832.

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[EN] Lampung, a province where Institut Teknologi Sumatera (ITERA) is located, is an area that has a high level of seismicity. This research takes a case study of the Building E ITERA which has a dilatation building concept. Due to dilatation, inter-buildings have the risk of collisions because of earthquake loads. The purpose of this study is to determine the value of joint displacement in adjacent buildings when given a dynamic load of Time History and determine whether the adjacent buildings experience a pounding effect. A Time History earthquake load data that has been matched with the Lampung region response spectrum by software is applied to the model of Building E. Building E is modeled according to the as built drawing data and the results of field checking. Structure is analyzed using software. The results of the study showed that the structure of the Building E which was loaded by Loma Prieta earthquake that has been matched would experience inter-building collisions. Further research using earthquake record data taken in areas within certain radius from ITERA is need to be conducted to obtain more accurate results.
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44

Zheng, Liang. "Finite Element Analysis of a Single-Layer Reticulated Dome and the Suspendome under Impact Loading." Advanced Materials Research 594-597 (November 2012): 844–48. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.844.

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This paper treats the impact force and the displacement of the lamella single-layer reticulated dome and the suspendome under axial impact loading using non-linear finite element techniques. The influence of loading parameters and the cable force of the suspendome on the impact response is investigated using validated numerical models. Results are quantified in terms of important impact response parameters and indicate that the peak displacement of the lamella single-layer reticulated dome and the suspendome can be clearly divided into four stages with time , and time history curve of the impact force can be divided into three stages.
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45

Liu, Ying Li, Chun Miao Li, and Te Liang Yan. "Dynamic Analysis of the Base Isolator Structure." Advanced Materials Research 143-144 (October 2010): 832–36. http://dx.doi.org/10.4028/www.scientific.net/amr.143-144.832.

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Isolators are included in the new earthquake-resistant standard. This article analyses some questions on base-isolators and presents a non-linear dynamic computing-model for the time-history. A corresponding computer program is also compiled. With the program, the earthquake response of a isolated structure including the displacement, acceleration and the shear force of each floor are calculated and compared with those of the same structure without base-isolation. It has been found that base-isolation has important realistic significance in mitigating earthquake disaster effectively and has enormous economic and social benefits. Therefore it is a kind of extremely popularizing and applying new technology.
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46

Attiaa, Rasha Attia Ahmed, Reham Mohamed Galal Ebrahim El-Tahawy, and Mohamed Nour El-Din Fayed. "Seismic Response Modification Factor for Special Concrete Structures Based on Pushover &Non-linear Time History Analyses." Advances in Science, Technology and Engineering Systems Journal 5, no. 1 (February 2020): 436–45. http://dx.doi.org/10.25046/aj050156.

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47

Ye, Cheng Jie, and Zao Liang Gao. "Simple Harmonic Excitation Numerical Analysis and Experimental Study of Space Bidirectional Beam String Structure." Advanced Materials Research 368-373 (October 2011): 3–11. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.3.

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In this paper,a two-way winding-beam space-harmonic excitation beam string under the action of the dynamic response has been studied to capture the dynamic response of the structure of the law, identify the structure of the weak components,and for the design and construction to provide the necessary theoretical data. Using ANSYS finite element software to numerical analysis and reduced scale quarter ratio of model test research methodology to study,using experimental test results and finite element numerical analysis of mutual authentication.Numerical analysis taking into account the geometric non-linear structure,carried out static analysis,modal analysis,harmonic analysis and transient response time-history analysis. Experimental studies of the dynamic signal acquisition and analysis and processing, through the comparative analysis of data, master of the winding space for a two-way steel beam string dynamic response law obtained structural response of the frequency response range,weak location and distribution of components of type of structural design and construction process were proposed.
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48

Santo, H., P. H. Taylor, E. Carpintero Moreno, P. Stansby, R. Eatock Taylor, L. Sun, and J. Zang. "Extreme motion and response statistics for survival of the three-float wave energy converter M4 in intermediate water depth." Journal of Fluid Mechanics 813 (January 17, 2017): 175–204. http://dx.doi.org/10.1017/jfm.2016.872.

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This paper presents both linear and nonlinear analyses of extreme responses for a multi-body wave energy converter (WEC) in severe sea states. The WEC known as M4 consists of three cylindrical floats with diameters and draft which increase from bow to stern with the larger mid and stern floats having rounded bases so that the overall system has negligible drag effects. The bow and mid float are rigidly connected by a beam and the stern float is connected by a beam to a hinge above the mid float where the rotational relative motion would be damped to absorb power in operational conditions. A range of focussed wave groups representing extreme waves were tested on a scale model without hinge damping, also representing a more general system of interconnected cylindrical floats with multi-mode forcing. Importantly, the analysis reveals a predominantly linear response structure in hinge angle and weakly nonlinear response for the beam bending moment, while effects due to drift forces, expected to be predominantly second order, are not accounted for. There are also complex and violent free-surface effects on the model during the excitation period driven by the main wave group, which generally reduce the overall motion response. Once the main group has moved away, the decaying response in the free-vibration phase decays at a rate very close to that predicted by simple linear radiation damping. Two types of nonlinear harmonic motion are demonstrated. During the free-vibration phase, there are only double and triple frequency Stokes harmonics of the linear motion, captured using a frequency doubling and tripling model. In contrast, during the excitation phase, these harmonics show much more complex behaviour associated with nonlinear fluid loading. Although bound harmonics are visible in the system response, the overall response is remarkably linear until temporary submergence of the central float (‘dunking’) occurs. This provides a strong stabilising effect for angular amplitudes greater than ${\sim}30^{\circ }$ and can be treated as a temporary loss of part of the driving wave as long as submergence continues. With an experimentally and numerically derived response amplitude operator (RAO), we perform a statistical analysis of extreme response for the hinge angle based on wave data at Orkney, well known for its severe wave climate, using the NORA10 wave hindcast. For storms with spectral peak wave periods longer than the RAO peak period, the response is controlled by the steepness of the sea state rather than the wave height. Thus, the system responds very similarly under the most extreme sea states, providing an upper bound for the most probable maximum response, which is reduced significantly in directionally spread waves. The methodology presented here is relevant to other single and multi-body systems including WECs. We also demonstrate a general and potentially important reciprocity result for linear body motion in random seas: the averaged wave history given an extreme system response and the average response history given an extreme wave match in time, with time reversed for one of the signals. This relationship will provide an efficient and robust way of defining a ‘designer wave’, for both experimental testing and computationally intensive computational fluid dynamics (CFD), for a wide range of wave–structure interaction problems.
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49

Reyes, Juan C., and Erol Kalkan. "Significance of Rotating Ground Motions on Behavior of Symmetric- and Asymmetric-Plan Structures: Part I. Single-Story Structures." Earthquake Spectra 31, no. 3 (August 2015): 1591–612. http://dx.doi.org/10.1193/072012eqs241m.

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The California Building Code requires at least two ground motion components for the three-dimensional (3-D) response history analysis (RHA) of structures. For near-fault sites, these records should be rotated to fault-normal/fault-parallel (FN/FP) directions, and two RHA analyses should be performed separately. This approach is assumed to lead to two sets of responses that envelope the range of possible responses over all non-redundant rotation angles. This assumption is examined here using 3-D computer models of single-story structures having symmetric and asymmetric plans subjected to a suite of bidirectional earthquake ground motions. The influence that the rotation angle has on several engineering demand parameters is investigated in linear and nonlinear domains to evaluate the use of the FN/FP directions, and the maximum direction (MD). The statistical evaluation suggests that RHAs should be conducted by rotating a set of records to the MD and FN/FP directions, and taking the maximum response values from these analyses as design values.
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50

Koukouselis, Apostolos, Konstantinos Chatziioannou, Euripidis Mistakidis, and Vanessa Katsardi. "Development of an equivalent static method for the approximation of the dynamic response of offshore structures." Engineering Computations 36, no. 4 (May 13, 2019): 1121–41. http://dx.doi.org/10.1108/ec-08-2018-0386.

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Purpose The design of compliant towers in deep waters is greatly affected by their dynamic response to wave loads as well as by the geometrical and material nonlinearities that appear. In general, a nonlinear time history dynamic analysis is the most appropriate one to be applied to capture the exact response of the structure under wave loading. However, this type of analysis is complex and time-consuming. This paper aims to develop a simplified methodology, which can adequately approximate the maximum response yielded by a dynamic analysis by means of a static analysis. Design/methodology/approach Various types of time history dynamic analysis are first applied on a detailed structural model, ranging from linear to fully nonlinear, that are used as reference solutions. In the sequel, a simplified analysis model is formulated, capable of reproducing the response of the entire structure with significantly reduced computational cost. In the next stage, this model is used to obtain the linear and nonlinear response spectra of the structure. Finally, these spectra are used to formulate a simplified design approach, based on equivalent static loads. Findings This simplified design approach produces good results in cases that the response is mainly governed by the first eigenmode, which is the case when compliant towers are considered. Originality/value The present paper borrows ideas from the area of earthquake engineering, where simplified methodologies can be used for the design of a certain class of structures. However, the development of a simplified methodology for the approximation of the dynamic behavior of offshore structures under wave loading is a much more complex problem, which, to the authors’ knowledge, has not been addressed till now.
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