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Статті в журналах з теми "CFST arches"

Автор: Grafiati
Опубліковано: 10 січня 2023
Оновлено: 28 січня 2023

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1

Shi, Jun, Kangkang Yang, Kaikai Zheng, Jiyang Shen, Guangchun Zhou, and Yanxia Huang. "AN INVESTIGATION INTO WORKING BEHAVIOR CHARACTERISTICS OF PARABOLIC CFST ARCHES APPLYING STRUCTURAL STRESSING STATE THEORY." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 25, no. 3 (March 7, 2019): 215–27. http://dx.doi.org/10.3846/jcem.2019.8102.

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Анотація:
This paper conducts the experimental and simulative analysis of stressing state characteristics for parabolic concretefilled steel tubular (CFST) arches undergoing vertical loads. The measured stain data is firstly modeled as the generalized strain energy density (GSED) to describe structural stressing state mode. Then, the normalized GSED sum Ej,norm at each load Fj derives the Ej,norm-Fj curve reflecting the stressing state characteristics of CFST arches. Furthermore, the Mann-Kendall criterion is adopted to detect the stressing state change of the CFST arch during its load-bearing process, leading to the revelation of a vital stressing state leap characteristic according to the natural law from quantitative change to qualitative change of a system. The revealed qualitative leap characteristic updates the existing definition of the CFST arch’s failure load. Finally, the accurate formula is derived to predict the failure/ultimate loads of CFST arches. Besides, a method of numerical shape function is proposed to expand the limited strain data for further analysis of the stressing state submodes. The GSED-based analysis of structural stressing state opens a new way to recognize the unseen working behavior characteristics of arch structures and the updated failure load could contribute to the improvement on the structural design codes.
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2

Jiang, Wei, and Da Gang Lu. "In-Plane Creep Stability Design of Concrete Filled Steel Tubular Arches Using Inverse Reliability Method." Applied Mechanics and Materials 351-352 (August 2013): 1601–4. http://dx.doi.org/10.4028/www.scientific.net/amm.351-352.1601.

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Анотація:
An inverse first order reliability method (FORM) is presented to solve the safety factors for the in-plane creep stability of concrete filled steel tubular (CFST) arches. In the inverse analysis, the safety factors with or without considering the time-dependent behavior of concrete are introduced into limit state equations for the in-plane stability design of CFST arches. For different target reliability indices and steel ratios, the time-independent and time-dependent safety factors are solved. The results show that the inverse FORM is of good efficiency and applicability. The target reliability indices have little effect on the safety factors for the creep stability of CFST arches. The effects of steel ratios are significant which should be considered in design. For the commonly used steel ratios of CFST arches, the in-plane safety factors for creep stability range from 1.17 to 1.43.
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3

Luo, Kai, Yong Lin Pi, Wei Gao, and Mark A. Bradford. "Finite Element Model for Analysis of Time-Dependent Behaviour of Concrete-Filled Steel Tubular Arches." Applied Mechanics and Materials 553 (May 2014): 606–11. http://dx.doi.org/10.4028/www.scientific.net/amm.553.606.

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Анотація:
This paper presents a finite element model for the linear and nonlinear analysis of time-dependent behaviour of concrete-filled steel tubular (CFST) arches. It is known when a CFST arch is subjected to a sustained load, the visco-elastic effects of creep in the concrete core will result in significant increases of the deformations and internal forces in the long-term. In this paper, a finite element model is developed using the age-adjusted effective modulus method to describe the creep behaviour of the concrete core. The finite element results of long-term displacement and stress redistribution agree very well with their analytical counterparts. The finite element model is then used to compare the linear and nonlinear results for the long-term behaviour of shallow CFST arches. It is demonstrated that the linear analysis underestimates the long-term deformations and internal force significantly and that to predict the time-dependent behaviour shallow CFST arches accurately, the nonlinear analysis is essential.
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4

Mei, Yuchun, Xiuming Li, Weiteng Li, Ning Yang, Yuhua Zhang, and Shuo Zhang. "Bearing properties and influence laws of concrete-filled steel tubular arches for underground mining roadway support." Science and Engineering of Composite Materials 27, no. 1 (March 26, 2020): 73–88. http://dx.doi.org/10.1515/secm-2020-0008.

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Анотація:
AbstractThe concrete-filled steel tubular (CFST) arch is a new high-strength support form for a mine roadway in deep/soft rock stratum; however, the bearing characteristics have not been clearly elucidated for scientifically guiding field applications. Numerical simulation tests with 15 schemes shaped as a ‘half circle with two straight legs’ and 10 schemes shaped as a circle were conducted, and the main responses of the numerical model were verified by performing the laboratory tests to evaluate the basic CFST structures and global CFST arches. The bearing and failure behaviors of the CFST arches were studied, and the influence laws, in terms of the arch shape, size and lateral pressure coefficient λ, were further investigated. The results show that the bearing capacity of a circular arch is significantly higher than that of a straight-leg arch under a uniform load. Furthermore, the bearing capacity of the circular arch decreases considerably with the increase in the arch size or λ. In addition, the bearing capacity of a straight-leg arch decreases with the increase in the leg height and arch size; however, it first increases and later decreases with the increase in λ. The failure modes of all the arches correspond to the instability at the extreme point caused by the strength deterioration, except in the case of a circular arch under a uniform pressure, the failure mode of which corresponds to the instability at the branch points. Finally, the recommendations for the field practice are proposed and verified.
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5

Gao, Jing, and Bao Chun Chen. "Finite Element Analysis of Ultimate Load-Carrying Capacity of CFST-CSW Arches." Advanced Materials Research 163-167 (December 2010): 1910–15. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.1910.

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Анотація:
In order to better understand the behavior of CFST-CSW arch, experiment on two hingeless CFST-CSW arches are described in this paper, subjected to in-plane symmetrical and asymmetrical loading respectively. The experiment yield important information regarding the manifestation of the limit state and also afford an opportunity to verify finite element modeling techniques for use in a parametric study. The parametric study reveals that the load-carrying capacity is influenced by many factors including the rise-to-span ratio, slenderness ratio, loading cases and material properties.
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6

Li, Lei, and Ke Lei. "Preliminary Design and Cross-Sectional Form Study of Closed-Type Concrete-Filled Steel Tube Support for Traffic Tunnel." Symmetry 12, no. 8 (August 17, 2020): 1368. http://dx.doi.org/10.3390/sym12081368.

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Анотація:
In view of the structural form and common construction methods of traffic tunnels, the bearing performance of the closed-type CFST support designed for traffic tunnels is studied. The closed-type CFST support, which consist of a CFST girder with external shotcrete, is improved from the CFST support used in mine roadways. The reasonable cross-sectional form of closed-type CFST support is analyzed by the FEM. The closed-type CFST support is mainly composed of CFST arches, a shotcrete layer, sleeves, and blind flanges. The post-buckling analysis of the closed-type CFST circular arch members using circular-shaped, rectangular-shaped, triangular-shaped, and trapezoidal-shaped steel tubes is implemented. The result shows that the closed-type CFST support has better performance than the traditional tunnel support. The study also found that for closed-type CFST support, the triangular-shaped steel tube section has the highest bearing capacity, stiffness, and steel utilization rate, which is the preferred cross-sectional form. The bearing capacity of the circular-shaped steel tube section is acceptable. Moreover, the circular-shaped steel tubes are more convenient to obtain and process, so it is also an optional cross-sectional form. The square-shaped and trapezoidal-shaped steel tube sections have neither performance advantages nor economic efficiency, so these two forms are not recommended.
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7

Bradford, Mark Andrew, and Yong-Lin Pi. "Geometric Nonlinearity and Long-Term Behavior of Crown-Pinned CFST Arches." Journal of Structural Engineering 141, no. 8 (August 2015): 04014190. http://dx.doi.org/10.1061/(asce)st.1943-541x.0001163.

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8

Jiang, Wei. "Time-dependent reliability analysis for out-plane stability of CFST arches." IOP Conference Series: Earth and Environmental Science 531 (July 31, 2020): 012068. http://dx.doi.org/10.1088/1755-1315/531/1/012068.

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9

Sheng, Ye. "Experimental Study on In-Plane Behavior of CFST Arch with New-Type Dumbbell-Shaped Section." Advanced Materials Research 255-260 (May 2011): 1198–203. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.1198.

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Анотація:
The weakness of traditional dumbbell-shaped section is that when concrete is filled into the web space, great stress is likely to produce cracks in the weld sealing between steel tube and web plates. In order to avoid this condition, a new-type dumbbell-shaped section is proposed. Experiments on concrete filled steel tubular (CFST) model arches with new-type dumbbell-shaped section have been carried out, concentrated loading at crown and L/4 section respectively. The result indicated that the new-type CFST arch has good elastic-plastic behavior and high strength, no local buckling appeared during the whole loading process, its in-plane mechanic behavior is similar with that of the CFST arch with single-tube. The dual nonlinear finite element calculation model is set up for the model arch, by means of this model the load-deflection curves during the loading process and the ultimate load-carrying capacity is analyzed.
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10

Rajeev, Shilpa, Deepak John Peter, and M. V. Varkey. "Study of Concrete Filled Steel Tubular Arch Bridge: A Review." Applied Mechanics and Materials 857 (November 2016): 261–66. http://dx.doi.org/10.4028/www.scientific.net/amm.857.261.

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Анотація:
In many developed countries, concrete filled steel tubular arch bridges are being constructed for roads and railway lines. The CFST arch bridges use steel tubular arches with self consolidating concrete pumped inside and the steel tube provides confinement to the concrete infill. Also, these concrete filled steel tubes have enhanced ductility, better seismic performance, aesthetic quality, lesser consumption of materials and self weight, speedy construction and small vibrations according to studies conducted earlier. Due to the presence of steel tube, local buckling of arch is delayed and reduces the ingress of moisture when exposed to harsh environmental conditions. This paper aims to find the seismic performance of CFST arch bridges in terms of seismic output and deformation when compared to conventional bridges being currently constructed.
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11

Yang, LuFeng, WeiWei Xie, YuFeng Zhao, and Jian Zheng. "Linear elastic iteration technique for ultimate bearing capacity of circular CFST arches." Journal of Constructional Steel Research 172 (September 2020): 106135. http://dx.doi.org/10.1016/j.jcsr.2020.106135.

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12

Shi, Tuo, Nianchun Deng, Xiao Guo, Wen Xu, and Shi Wang. "Experimental Study on Deformation Behavior and Compressive Strength of Concrete Cast in Steel Tube Arches under Low-Temperature Conditions." Advances in Materials Science and Engineering 2020 (February 6, 2020): 1–10. http://dx.doi.org/10.1155/2020/8016282.

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Анотація:
Taking the construction of a concrete-filled steel tube (CFST) arch bridge (part of the Sichuan-Tibet Railway) in low temperatures as the test site, firstly the deformation performance test of concrete was carried out. Following this initial testing, measurement of compressive strength and shrinkage performance was conducted in large-diameter CFSTs under a variety of curing conditions. Experimental results showed that the expansion effect of Ca-Mg composite expansive agent in concrete was better than that of other expansive agents at any stage. Under low-temperature curing (0°C), the sampling strength of the large-diameter CFSTs reached 73.5% of the design strength at 28 d in the presence of a nonthermal curing system. The design strength itself was reached, when a curing system involving a thermal insulation film was applied, and use of this film also led to improvements in concrete shrinkage. The results suggested that a Ca-Mg composite expansive agent, combined with an insulation film curing system, should be the technique selected for concrete pumping construction of CFST arch bridges in Tibet.
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13

Zhao, YuFeng, WeiWei Xie, and Lu Feng Yang. "Elastic modulus reduction method for stable bearing capacity analysis of dumbbell-shaped CFST arches." Journal of Physics: Conference Series 2044, no. 1 (October 1, 2021): 012163. http://dx.doi.org/10.1088/1742-6596/2044/1/012163.

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14

Jiang, Wei, Lei Wang, and Yanjun Li. "Out-plane stability safety factors of CFST arches using inverse finite element reliability method." IOP Conference Series: Materials Science and Engineering 392 (August 2, 2018): 022035. http://dx.doi.org/10.1088/1757-899x/392/2/022035.

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15

Sheng, Ye. "Parameter Analysis on Ultimate Load-Carrying Capacity of CFST Arch Rib with New-Type Dumbbell-Shaped Section." Advanced Materials Research 634-638 (January 2013): 3825–29. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.3825.

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Анотація:
Experiments on concrete filled steel tubular (CFST) model arches with new-type dumbbell-shaped section have been carried out, concentrated loading at crown and L/4 section respectively. Applied with large general program ANSYS, a finite element calculation model was set up for the model arch, by means of this model the main parameters including arch axis coefficient, ratio of rise to span, slenderness ratio, and steel ratio are analyzed. Based on the discussion of influence of parameter variation on nonlinear characteristics and ultimate load-carrying capacity of model arch, the theoretical basis is established for the development of this structure and the conclusion can be taken as reference in practice use and further research work.
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16

Luo, Kai, Yong-Lin Pi, Wei Gao, and Mark A. Bradford. "Long-term structural analysis and stability assessment of three-pinned CFST arches accounting for geometric nonlinearity." Steel and Composite Structures 20, no. 2 (February 10, 2016): 379–97. http://dx.doi.org/10.12989/scs.2016.20.2.379.

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17

Yang, Wang, Shi, Sun, Zheng, and Zhang. "Investigation on Single Tube CFST Arch Models by Modeling Structural Stressing State Based on NSF Method." Applied Sciences 9, no. 23 (November 20, 2019): 5006. http://dx.doi.org/10.3390/app9235006.

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Анотація:
This paper investigated the behavioral characteristics of two single tube concrete-filled steel tube (CFST) arch models under different loads. Applying the numerical shape function (NSF) method, the limited strain data of arch models were interpolated to obtain more detailed strain information at unmeasured points. By numerically modeling and characterizing the structural stressing state of arches, these interpolated strains were calculated as the normalized strain energy density (SED) sum to plot the corresponding characteristic curves. Utilizing the Mann-Kendall (M-K) criterion, the qualitative characteristic load was detected from the curve and was referred to as the failure load, updating the existing definition of structural failure. Then, from the perspective of experimental strains, strain/stress fields, and stressing state submodes of internal forces obtained based on the NSF method, the working behavioral characteristics of each respective CFST arch model under loads were embodied in detail. The mutation features were distinguished from the development trend of strain/stress fields or distribution patterns of internal forces to verify the rationality of the updated failure load. Consequently, the NSF method can have a reasonable interpolation on the limited experimental data. By modeling structural stressing state, it can conduct an accurate estimation of the structural failure load and provide a reference for the future design of arch bridges.
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18

Serrano, J., J. M. Jamilla, B. C. Hernandez, and E. Herrera. "EVALUATING HYDROLOGIC MODEL PERFORMANCE OF GLOBAL AND LOCAL WEATHER DATA INPUTS." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLVI-4/W6-2021 (November 18, 2021): 265–71. http://dx.doi.org/10.5194/isprs-archives-xlvi-4-w6-2021-265-2021.

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Abstract. Runoffs from hydrologic models are often used in flood models, among other applications. These runoffs are converted from rainfall, signifying the importance of weather data accuracy. A common challenge for modelers is local weather data sparsity in most watersheds. Global weather datasets are often used as alternative. This study investigates the statistical significance and accuracy between using local weather data for hydrologic models and using the Climate Forecast System Reanalysis (CFSR), a global weather dataset. The Soil and Water Assessment Tool (SWAT) was used to compare the two weather data inputs in terms of generated discharges. Both long-term and event-based results were investigated to compare the models against absolute discharge values. The basin’s average total annual rainfall from the CFSR-based model (4062 mm) was around 1.5 times the local weather-based model (2683 mm). These basin precipitations yielded annual average flows of 53.4 cms and 26.7 cms for CFSR-based and local weather-based models, respectively. For the event-based scenario, the dates Typhoon Ketsana passed through the Philippine Area of Responsibility were checked. CFSR only read a spatially averaged maximum daily rainfall of 18.8 mm while the local gauges recorded 157.2 mm. Calibration and validation of the models were done using the observed discharges in Sto. Niño Station. The calibration of local weather-based model yielded satisfactory results for the Nash-Sutcliffe Efficiency (NSE), percent of bias (PBIAS), and ratio of the RMSE to the standard deviation of measured data (RSR). Meanwhile, the calibration of CFSR model yielded unsatisfactory values for all three parameters.
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19

Huang, Yonghui, Zhicheng Yang, Jiyang Fu, and Airong Liu. "Long-term lateral-torsional buckling behavior of pin-ended CFST arches under uniform radial loads and temperature field." Mechanics of Advanced Materials and Structures, March 24, 2020, 1–15. http://dx.doi.org/10.1080/15376494.2020.1743397.

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20

Xu, Yan, Bo Li, Qingxiong Wu, and Huihui Yuan. "Failure mechanism and load carrying capacity of an arched partially CFST bridge tower considering different concrete filling lengths." Structure and Infrastructure Engineering, November 13, 2022, 1–16. http://dx.doi.org/10.1080/15732479.2022.2141271.

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