Relevant bibliographies by topics / Slenderness ration

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  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'Slenderness ration'

Author: Grafiati
Published: 19 February 2023

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Journal articles on the topic "Slenderness ration"

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Radojcic, Dejan, Antonio Zgradic, Milan Kalajdzic, and Aleksandar Simic. "Resistance Prediction for Hard Chine Hulls in the Pre-Planing Regime." Polish Maritime Research 21, no. 2 (April 1, 2014): 9–26. http://dx.doi.org/10.2478/pomr-2014-0014.

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Abstract A mathematical representation of calm-water resistance for contemporary planing hull forms based on the USCG and TUNS Series is presented. Regression analysis and artificial neural network (ANN) techniques are used to establish, respectively, Simple and Complex mathematical models. For the Simple model, resistance is the dependent variable (actually R/Δ for standard displacement of Δ = 100000 lb), while the Froude number based on volume (FnV) and slenderness ration (L/V1/3) are the independent variables. In addition to these, Complex model’s independent variables are the length beam ratio (L/B), the position of longitudinal centre of gravity (LCG/L) and the deadrise angle (β). The speed range corresponding to FnV values between 0.6 and 3.5 is analyzed. The Simple model can be used in the concept design phases, while the Complex one might be used for various numerical towing tank performance predictions during all design phases, as appropriate
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Wang, Bin. "Experimental Behavior of Concrete-Filled Square Steel Tube of Mid and Long Columns Subjected to Eccentric Compression." Advanced Materials Research 255-260 (May 2011): 118–22. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.118.

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This paper presents an experimental investigation of the mechanic behavior of 9 concrete-filled square steel tube columns (CFSST) subjected to eccentric loading. The primary parameters of the specimens are eccentricity ratios, slenderness ratios and concrete strength. The results showed that the eccentricity ratios and slenderness ratios are the primary factors to influence the load-bearing capacity of CFSST columns, with the increase of eccentricity ratios and slenderness ratios, the limit load-bearing capacity reduced gradually. The influence of concrete strength to load-bearing capacity decreased gradually with the increase of eccentricity ratios and slenderness ratios.
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Liu, Jui-Ling, Dung M. Lue, and Ching H. Lin. "Investigation on slenderness ratios of built-up compression members." Journal of Constructional Steel Research 65, no. 1 (January 2009): 237–48. http://dx.doi.org/10.1016/j.jcsr.2008.02.012.

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Vincent, Thomas, and Togay Ozbakkaloglu. "Influence of Slenderness on Behavior of High-Strength Concrete-Filled FRP Tubes under Axial Compression." Applied Mechanics and Materials 501-504 (January 2014): 963–68. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.963.

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This paper presents an experimental investigation on the influence of specimen slenderness on axial compressive behavior of concrete-filled fiber reinforced polymer (FRP) tubes (CFFTs). A total of 18 aramid FRP- (AFRP) confined high-strength concrete (HSC) specimens with circular cross-sections were tested. Specimens with height-to-diameter ratios of 1, 2, 3 and 5 were manufactured and tested, with all specimens maintaining a nominal diameter of 150 mm. The results indicate that specimens with an H/D of 1 exhibit significantly higher strength and strain enhancements compared to specimens with H/D ratios of 2 to 5. The influence of slenderness on specimens with H/D ratios between 2 and 5 was found to be significant in regards to axial strain enhancement, with a decrease observed as specimen slenderness increased. On the other hand, the influence of slenderness on axial strength enhancement of specimens with H/D ratios between 2 and 5 was found to be negligible.
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Salem, A. H., M. El Aghoury, F. F. El Dib, and M. T. Hanna. "Strength of biaxially loaded slender I-section beam-columns." Canadian Journal of Civil Engineering 34, no. 2 (February 1, 2007): 219–27. http://dx.doi.org/10.1139/l06-091.

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The strength of a slender section is governed by local buckling of its elements. The local buckling mode is mainly affected by the width to thickness ratios of elements forming the section and the member slenderness ratio. A nonlinear finite element model was developed in this paper to study the effect of the mentioned factors on the capacity of biaxially loaded slender I-section beam–columns. A group of I sections was selected with varying flange width to flange thickness and web width to web thickness ratios. Different member slenderness ratios were chosen to study the different modes of failure. The results show that the linear interaction equation is safe and provides a good fit to the ultimate capacity of members with intermediate slenderness ratios. It is conservative, however, for short member slenderness ratios. Lastly, compared with the newly developed finite element model, the 1996 edition of the American Iron and Steel Institute specification for cold-formed steel structural members and the European Committee for Standardization Eurocode 3 conservatively predict the capacity of members, especially for large ratios of minor axis to major axis bending.Key words: structural engineering, steel, stability, buckling, biaxial loads, ultimate strength.
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Tang, Yu, Zeyang Sun, and Gang Wu. "Compressive Behavior of Sustainable Steel-FRP Composite Bars with Different Slenderness Ratios." Sustainability 11, no. 4 (February 20, 2019): 1118. http://dx.doi.org/10.3390/su11041118.

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This paper presents experimental studies on the compressive behavior of a sustainable steel-fiber reinforced composite bar (SFCB) under uniaxial compressive loading. The SFCB, combined with steel and fiber reinforced polymer (FRP), is expected to significantly enhance structural safety and sustainability. A new test method with LVDT and extensometer sensors was developed and verified through experiments to test the tensile and compressive behavior of the SFCB. Fifty-four specimens including SFCB and inner steel bar (ISB) with different slenderness ratios were tested. The test results indicated that the initial compressive elastic modulus of the SFCB was essentially the same as its initial tensile elastic modulus. The compressive yield load of the SFCB was essentially irrelevant to the slenderness ratio, and the ultimate compressive stress of the SFCBs varied inversely with the slenderness ratios. The squash load of the SFCB tended to be conservative for predicting the compressive yield load of the SFCB, while the equivalent critical global buckling load of the SFCB was much higher than its corresponding compressive yield load and ultimate load due to the inelastic buckling mechanism of the SFCB within the range of the equivalent slenderness ratios studied in this paper.
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Kaur, Ravpreet, and Harvinder Singh. "Slenderness in Steel Fibre Reinforced Concrete Long Beams." Civil Engineering Journal 8, no. 6 (June 1, 2022): 1240–56. http://dx.doi.org/10.28991/cej-2022-08-06-011.

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Slenderness influences in steel fibre reinforced concrete (SFRC) long beams are not adequately addressed in current concrete design regulations. The present guidelines are confined to semi-empirical formulations for limiting slenderness ratio, but largely restricted to RC beams. Many scholars have already examined RC long beams and successfully presented the slenderness ratio formula for RC long beams. This article proposes a novel term for limiting the slenderness ratio for SFRC long rectangular beams based on the fundamental principle of mechanics and taking into account the slenderness impact of RC long beams as well as the flexural moment capacity of SFRC beams. The suggested formulation for limiting slenderness ratio agrees closely with experimental data and may reliably forecast the mode of collapse. The proposed limiting slenderness ratio formulation takes into consideration beam end circumstances, loading conditions, concrete strengths, steel, tension and compression reinforcement ratios, and transverse reinforcement ratios, among other factors. It is revealed that a wide variety of slenderness limits may be achieved for varied sets of design parameters. The researchers' predictions and the suggested equation are compared to the test results of 9 SFRC beams. The suggested equation fits well with the results of the tests that have been done so far. Doi: 10.28991/CEJ-2022-08-06-011 Full Text: PDF
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Kim, Do-Young, Chang-Hoon Sim, Jae-Sang Park, Joon-Tae Yoo, Young-Ha Yoon, and Keejoo Lee. "Buckling Knockdown Factors of Composite Cylinders under Both Compression and Internal Pressure." Aerospace 8, no. 11 (November 15, 2021): 346. http://dx.doi.org/10.3390/aerospace8110346.

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The internal pressure of a thin-walled cylindrical structure under axial compression may improve the buckling stability by relieving loads and reducing initial imperfections. In this study, the effect of internal pressure on the buckling knockdown factor is investigated for axially compressed thin-walled composite cylinders with different shell thickness ratios and slenderness ratios. Various shell thickness ratios and slenderness ratios are considered when the buckling knockdown factor is derived for the thin-walled composite cylinders under both axial compression and internal pressure. Nonlinear post-buckling analyses are conducted using the nonlinear finite element analysis program, ABAQUS. The single perturbation load approach is used to represent the geometric initial imperfection of thin-walled composite cylinders. For cases with the axial compressive force only, the buckling knockdown factor decreases as the shell thickness ratio increases or as the slenderness ratio increases. When the internal pressure is considered simultaneously with the axial compressive force, the buckling knockdown factor decreases as the slenderness ratio increases but increases as the shell thickness ratio increases. The buckling knockdown factors considering the internal pressure and axial compressions are higher by 2.67% to 38.98% compared with the knockdown factors considering the axial compressive force only. The results show the significant effect of the internal pressure, particularly for thinner composite cylinders, and that the buckling knockdown factors may be enhanced for all the shell thickness ratios and slenderness ratios considered in this study when the internal pressure is applied to the cylinder.
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Amoush, Essam A. "Experimental Investigation of the Axial Behaviour for Battened Tubular Columns." IOP Conference Series: Earth and Environmental Science 1056, no. 1 (August 1, 2022): 012036. http://dx.doi.org/10.1088/1755-1315/1056/1/012036.

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Abstract This paper describes a series of experiments on batten tubular specimens with various slenderness ratios. The experimental study was employed to satisfy the expectations of behaviour and axial load capability of battened tubular columns. Twelve specimens composed of four tubes having different global column slenderness and various ratios of the unbraced chord slenderness-to-the global column slenderness were chosen to cover stub, short and medium columns. The tubes were assembled with welded batten plates. A numerical model with a thin shell element considered both geometric and material nonlinearities was used to verify the experimental results. Tests result showed different failure modes, such as local, local-flexural and flexural buckling. By comparing, the finite element and tested results have a good agreement. The results revealed the strength of the battened columns, which was related to the effect of global slenderness and spacers on the buckling behaviour. Additionally, the stub, short and medium column strengths were enhanced by 8%, 25%, and 78%; respectively, when the number of spacers increased to four batten plates. Eventually, predicted strengths of the battened column by AISC and EC3 specifications were slightly un-conservative.
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Dai, Bibo, Xingdong Zhao, Shuwen Zhang, Qian Kang, and Zhonghua Zhu. "Mechanical Behavior and Energy Evolution of Sandstone considering Slenderness Ratio Effect." Advances in Civil Engineering 2020 (December 14, 2020): 1–13. http://dx.doi.org/10.1155/2020/8881416.

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To study the influence of slenderness ratio effect on the mechanical behavior, acoustic emission properties, and energy evolution of sandstone, the uniaxial compression tests coupled with acoustic emission technology are carried out at different slenderness ratios D (0.5, 1.0, 1.5, 2.0, 3.0). The results show that a logarithmic function relationship is observed between the peak strength, the peak strain, and the elastic modulus with slenderness ratio. The failure patterns of the tested sandstone varied significantly with the increasing slenderness ratio. When the slenderness ratio, D, is lower than 1.5, complex failures and multiple shear planes are formed, while simple failures and single shear planes are generated at D larger than 1.5. Besides, the AE ringing counts are more obvious with a higher slenderness ratio, D, at the initial compression stage due to the greater body volume and more defects in the sandstone. The energy evolution curves and energy ratio distribution curves can be divided into four stages, corresponding to the stress-strain curves.
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Dissertations / Theses on the topic "Slenderness ration"

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Regmi, Kamal. "EFFECT OF ROTATIONAL RESTRAINTS ON THERMAL POST BUCKLING RESPONSE OF SWAY COLUMNS." OpenSIUC, 2019. https://opensiuc.lib.siu.edu/theses/2527.

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The objective of this study is to examine the effect of rotational restraints on thermal post-buckling response of sway columns using geometrically nonlinear analysis. The present design approach considers columns to have failed once they buckle. However, the columns under fire load are found to exhibit significant post-buckling strength which could be utilized for more economical design. The past researchers on the nonlinear thermal analysis used isolated columns with idealized support conditions which mean the columns are assumed to be free or fully restrained in the rotation, lateral and, axial directions. However, that is seldom the case in real structures and the restraint at an end of the column depends upon the members connected at that joint. The restraint provided to the column by the members connected at the joint will be in between the free case and fully restrained case. This study incorporates the variation in rotational restraint due to changes in the properties of members connected at the ends of the column. The columns are assumed to be fully restrained in the axial direction. Since the study is being carried out on sway columns, the restraint in the lateral direction is zero.
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Shrestha, Sujan. "POST BUCKLING RESPONSE OF SWAY COLUMNS UNDER MECHANICAL AND THERMAL (FIRE) LOADS." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/theses/1623.

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AN ABSTRACT OF THE THESIS OF Sujan Shrestha, for the Master of Science degree in Civil Engineering, presented on March 3, 2015, at Southern Illinois University, Carbondale. TITLE: POST BUCKLING RESPONSE OF SWAY COLUMNS UNDER MECHANICAL AND THERMAL (FIRE) LOADS MAJOR PROFESSOR: Dr. Aslam Kassimali, Ph.D. The post-buckling response of sway columns under mechanical and thermal loadings are presented by using the geometrical nonlinear analysis. For thermal analysis, the columns are assumed to be fully restrained in their axial directions. The method of analysis uses Beam-Column theory which is based on an Eulerian (corotational) formulation. Numerical solutions are shown for the post-buckling response of sway columns. The numerical investigations of the geometrically nonlinear analysis of sway columns were carried out with three different boundary conditions of sway columns as suggested by AISC, under mechanical loading and temperature changes. The sway columns considered are the cases `c', `e' and `f' in Table C-A-7.1 of AISC Manual (2011). These were modeled and analyzed to predict the post-buckling response under the mechanical and thermal loads. Furthermore, for each of these support conditions, the effects of slenderness ratios on the post-buckling response were analyzed by considering the slenderness ratios of 50,125 and 200. Also, the effects on post-buckling strength were observed keeping the same slenderness ratios but varying rotational end conditions of sway columns. Many useful conclusions can be drawn from this study. The more important conclusions are: 1) As all unrestrained sway columns undergo excessive deformation under mechanical loading, they do not possess significant post-buckling strength once the loading reaches the buckling load. 2) All restrained sway columns undergo much smaller deformations under thermal loading as compared to mechanical loading; thus significant post-buckling strength is achieved even after reaching the buckling temperature. This post-buckling strength can be considered during the design of structures which will aid in safe and economical structures. 3) Slenderness ratios play an important role on post-buckling strength only in thermal analysis but not in mechanical analysis. Increase in slenderness ratio tends to decrease the post-buckling relative deformation of the columns under thermal loading but has no such effect under mechanical loading. 4) Rotational end conditions also play significant role on post-buckling strength during thermal analysis but not during mechanical analysis. Keeping the slenderness ratio constant and varying the rotational end conditions, the post-buckling strength of all sway columns remains same under mechanical loading but is different under thermal loading.
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FERNANDES, Rodrigo. "Critérios normativos sobre influência da relação Aw/Af e esbeltez de alma no cálculo da resitência à flexão de vigas esbeltas em elementos de estruturas de aço." Universidade Federal de Goiás, 2007. http://repositorio.bc.ufg.br/tede/handle/tde/665.

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Made available in DSpace on 2014-07-29T15:03:35Z (GMT). No. of bitstreams: 1 pre-textuais Rodrigo Fernandes.pdf: 349523 bytes, checksum: 27a5e6d7df167303c662872391301d36 (MD5) Previous issue date: 2007-10-01
This work contains a theoretical analysis of the behavior of plate girders. A plate girder has been calculated based on the criteria of the American standard Manual of Steel Construction Load and Resistance Factor Design (AISC, 1994), and checked by the Brazilian standard NBR 8800: Projeto e execução de estruturas de aço de edifícios (método dos estados limites) (ABNT, 1986), the revision project of the Brazilian standard Projeto de Revisão da NBR 8800: Projeto e execução de estruturas de aço e de estruturas mistas aço-concreto de edifícios (ABNT, 2003), the revision project of the Brazilian standard Projeto de Revisão da NBR 8800: Projeto de estruturas de aço e de estruturas mistas de aço e concreto de edifícios (ABNT, 2007) and the European standard Eurocode 3: Design of steel structures Part 1.1: General rules and rules for buildings (CEN, 1992). PFEIL (1989) has calculated a plate girder by using the Brazilian standard NBR 8800/86. The calculated dimension have been checked by the mentioned standards. NARAYANAN (1992 apud OWENS, KNOWLES E DOWLING, 1992) has dimensioned a plate girder by using the British standard BS 5950: Structural use of steelwork in building. Part 1: Code of practice for design in simple and continuous construction: hot rolled sections (BSI, 1990), which has also been checked by the mentioned standards. Furthermore, theoretical analyses related to the calculus of plate girders presented by many authors have been considered. The main goal is to assess the criteria utilized by the standards for the calculus of plate girders. From the obtained results, for the checked girders, by the standards and related theories, a comparative analysis among the utilized criteria by the standards has been made. The reached conclusion is that the Brazilian standard and its revision projects has identical criteria compared to the American standard for the calculus of plate girders. The European standard presents slightly different criteria compared to the American standard; however, both provide close results one compared to another. The theories utilized have also provided close results from those obtained by the standards.
Neste trabalho é feita uma análise teórica sobre o comportamento de vigas esbeltas. Uma viga esbelta foi dimensionada com base nos critérios da norma americana Manual of Steel Construction Load and Resistance Factor Design (AISC, 1994), e depois verificada pela norma brasileira NBR 8800: Projeto e execução de estruturas de aço de edifícios (método dos estados limites) (ABNT, 1986), pelo projeto de revisão da norma brasileira Projeto de Revisão da NBR 8800: Projeto e execução de estruturas de aço e de estruturas mistas aço-concreto de edifícios (ABNT, 2003), pelo projeto de revisão da norma brasileira Projeto de Revisão da NBR 8800: Projeto de estruturas de aço e de estruturas mistas de aço e concreto de edifícios (ABNT, 2007) e pela norma européia Eurocode 3: Design of steel structures Part 1.1: General rules and rules for buildings (CEN, 1992). PFEIL (1989) dimensionou uma viga esbelta utilizando a norma brasileira NBR 8800/86. As dimensões calculadas foram verificadas pelas normas citadas. NARAYANAN (1992 apud OWENS, KNOWLES E DOWLING, 1992) dimensionou uma viga esbelta utilizando a norma britânica BS 5950: Structural use of steelwork in building. Part 1: Code of practice for design in simple and continuous construction: hot rolled sections (BSI, 1990), a qual foi também verificada pelas normas citadas. Também foram consideradas análises teóricas relativas ao cálculo de vigas esbeltas apresentadas por diversos autores. O objetivo principal é avaliar os critérios utilizados pelas normas para o cálculo de vigas esbeltas. A partir dos resultados obtidos, para as vigas analisadas, pelas normas e pelas teorias existentes, foi feita uma análise comparativa entre os critérios utilizados pelas normas. A conclusão a que se pôde chegar é que a norma brasileira e seus projetos de revisão apresentam critérios idênticos aos da norma americana para o cálculo de vigas esbeltas. A norma européia apresenta critérios um pouco diferenciados dos critérios da norma americana, mas fornecem resultados aproximados entre si. As teorias utilizadas também forneceram resultados aproximados dos resultados obtidos pelas normas.
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Banys, Tomas. "Ugdymo kirtimų projektavimas ir vertinimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2005. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2005~D_20050609_144419-80803.

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The purpose of this study is to explore haw thinning planning standards agree with standards of estimation. Study was carried out in Kretinga forest enterprise Grūšlaukė forestry. Study of ratio of stands medial diameter and medial high was carried out in 11 – 60 years old pure spruce. The main purpose of thinning is to increase total productivity of forest stands and to form desirable structure and closeness of stands. It is important that all kinds of forest thinning concern biodiversity, increase resistance to wind and snow damage of forest stands, improve the quality of growing timber. Forests thinning use that timber part which rots in forests and gives no profit. To reach all these purpose forests thinning must be planned. Planning standard must be definite as it possible. It is important that these standards be suit with forests thinning normative. It was estimated that both standards has different rates and they are not matched. Thinning is planning by thickness of stands, but they are estimating by the number of trees in one hectare of stands. It was estimated that the ratio of forest stands medial diameter and medial high can be used in thinning planning. In pure spruce stands thinning must planned until ratio of medial diameter and medial high reach value: 0,8 in 11 – 20 years old stands; 0,9 in 21 – 40 years old stands; 1,0 in 41 – 60 years old stands.
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(9810410), Huigyeong Kim. "Experimental investigation of the structural behaviour of concrete-filled FRP tubes." Thesis, 2015. https://figshare.com/articles/thesis/Experimental_investigation_of_the_structural_behaviour_of_concrete-filled_FRP_tubes/13438292.

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Concrete-filled tubes (CFTs) are structural columns used to support compressive loads. A CFT takes advantage of the lateral confinement of the tube on the concrete core to increase the column strength. Since the development of CFT structures, steel has been the primary tube material. Over the last two decades however, fibre reinforced polymers (FRPs) have been increasingly used as tube materials because of their superior properties such as high specific strength and stiffness, superior corrosion resistance and good durability. This thesis describes a systematic experimental study of CFT columns with FRP as the tube material. This master’s project investigates the performance of FRP tubes of different properties and sizes. For this purpose, 12 CFT specimens with the length over diameter (L/D) ratios of 8 and 12, and diameter over tube thickness (D/t) ratios ranging from 11 to 43 were tested under compressive force with both ends of the columns set as pin joints. The experiments were carried out using a heavy loading machine and the experimental results are analysed in terms of strength and failure modes. The experimental results showed the significant improvements in column strength due to the confinement of the FRP tubes. It was demonstrated that while both L/D and D/t ratios influence column strength, D/t ratio plays a particularly important role in determining the column strength. The experimental results also showed the changes in failure modes with L/D and D/t ratios. To compare FRP tubes with plain concrete columns, an equivalent slenderness ratio for the CFT with FRP tube was derived. The equivalent slenderness ratio had good agreement with the D/t ration of the FRP tube. It was demonstrated that the equivalent slenderness can be used to determine the capacity of the CFT column using its D/t ratio.
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Yung-ChenChang and 張詠程. "A Study on Seismic Behavior and Strengthening of High Slenderness Ratio Braces." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/90978385790301533902.

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碩士
國立成功大學
建築學系碩博士班
101
In high-tech factories, the suspended level is used for handling suspension overhead system (OHS). Because OHS cannot resist lateral force, the earthquake may swing and cause equipment damage and shutting down the whole production line. Therefore, slender threaded bar often been used as braces in the suspended level to enhance the lateral stiffness. The dynamic mechanical behavior of these bars with high slenderness ratio in earthquake haven’t been studied before. In this research, we studied the dynamic mechanical behavior of the braces with high slenderness ratio through experiment, and then input the result to computer models to analyze the reaction of OHS in seismic activities. The experiments are focused on original braces and the reinforced braces modified by this research. In the static and dynamic experiments of the braces, it shows that the bars with high slenderness ratio provide a considerable effect of energy dissipation capacity in the elastic stage, and the effect increases along with the raising of excitating amplitude and frequency. With the lateral restraints provided by the reinforced braces, the bracing buckling strength increases enabling the braces to enter yield under compression force, and the hysteresis loop area become fuller than the original braces, hence providing a better energy dissipation effect. In the computer modeling analysis, it also shows that the modification of the reinforced braces is an effective way to improve the seismic capacity of OHS. The method of this modification is also economical and practical, that can be constructed in-situ quickly and easily.
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Hsu, Shu-Pu, and 許舒普. "Investigation on the slenderness ratio(s/db) of high strength rebar by means of low cycle fatigue testing." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/22992523473797765289.

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碩士
國立中央大學
土木工程學系
105
The purpose of the study is to discuss the moderate anti-buckle spacing of SD790/690 rebar. This is because the present standard only specifies the spacing of transverse reinforcement for SD420 bars. Thus, the experiment used the universal testing machine with different bar slenderness ratio to simulate the column components subjected to earthquake loading. Test specimens adopted 16mm and13mm diameter (common strength SD420 & high strength SD790). That is, SD690 bars normally used for larger diameter like D25 are not available to the testing machine at present. Therefore, SD790-D13 and SD420-D13 bars with different slenderness(s/db =5.5、6) and different amplitudes(εa =±0.5、±1、±2、2.6,-0.4、3.6,-0.4%), and SD790-D16 and SD420-D16 bars with different spacing(s/db =4.5、5、6) and different amplitudes(εa =±0.5、±1、±2、2.6,-0.4、3.6,-0.4%), are provided for the testing. By means of a series of test program, some parameters such as the number of life cycles, behavior of bar fracture and suitable bar slenderness ratio under the cyclic loading will be found. Test results show the load difference between the first cycle and the final cycle for SD790 bars is smaller than that for SD420 bars. However, the SD790 bars are fractured without warning, and the breaking surface is smooth. This article also analyzes the rebars anti-buckling spacing by measuring the effective length coefficient(k) and non-linear steel modulus(Et) of the testing bars. Thus the slenderness ratio(s/db) of anti-buckling spacing for the rebars can be calculated. It repeals the SD420 bars of s/db shall be smaller than 6 as recent ACI318 suggested. The SD790 bars of slender ratio shall be less than 4.Therefore, the SD690 bars normally used for New RC main bars shall be less than 5.
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Jamaluddin, N., Dennis Lam, Xianghe Dai, and J. Ye. "An experimental study on elliptical concrete filled columns under axial compression." 2013. http://hdl.handle.net/10454/5882.

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This paper presents the experimental results and observation of elliptical concrete filled tube (CFT) columns subjected to axial compressive load. A total of twenty-six elliptical CFT specimens including both stub and slender composite columns are tested to failure to investigate the axial compressive behaviour. Various column lengths, sectional sizes and infill concrete strength are used to quantify the influence of member geometry and constituent material properties on the structural behaviour of elliptical CFT columns. As there is no design guidance currently available in any Code of Practice, this study provides a review of the current design rules for concrete filled circular hollow sections in Eurocode 4 (EC4). New equations based on the Eurocode 4 provisions for concrete filled circular hollow sections were proposed and used to predict the capacities of elliptical CFT columns.
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Kuzmanovic, Aleksandar. "Preliminary Design of Slender Reinforced Concrete Highway Bridge Pier Systems." Thesis, 2014. http://hdl.handle.net/1807/65569.

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Feasible span-to-depth ratios for many modern bridge systems have been identified and documented in literature. No such parameters have been adequately identified in terms of proportioning bridge piers. This thesis includes a study of 22 existing reinforced concrete highway bridges and their respective pier systems to determine the state-of-the-art in design. The effect of different geometric and material parameters such as concrete strength, reinforcement ratio and slenderness ratio on the structural behavior of individual piers and multiple pier systems was examined. Approximate methods, which may be used for the purposes of preliminary design are discussed and reviewed. Serviceability and ultimate limit states design aids that can be used to identify appropriate preliminary cross-sectional pier dimensions and reinforcement ratios for individual piers given various slenderness ratios were developed. The structural behavior as well as an approach to the preliminary design of multiple pier bridge systems is presented.
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Book chapters on the topic "Slenderness ration"

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Almomani, M., K. Mahmoud, and E. El-Salakawy. "Effect of Slenderness Ratio on HSC Columns Reinforced with GFRP Bars and Spirals." In Lecture Notes in Civil Engineering, 565–72. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0656-5_48.

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Xue, Junqing, Yifei Zhang, Bruno Briseghella, and Baochun Chen. "Experimental Research on Effects of Debonding on Circular CFST Columns with Different Slenderness Ratios." In Structural Integrity, 369–77. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-29227-0_38.

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Xue, J. Q., J. G. Sun, B. Briseghella, B. C. Chen, and J. G. Wei. "Influence of slenderness ratios on mechanical performance of axially loaded CFST columns with circumferential debonding gap." In Bridge Safety, Maintenance, Management, Life-Cycle, Resilience and Sustainability, 1449–55. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003322641-176.

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"slenderness ratio." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 1245. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_194176.

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Quevedo-Rojas, Ana, and Mauricio Jerez-Rico. "Mixed Forest Plantations with Native Species for Ecological Restoration in Cloud Forests of the Venezuelan Andes." In Silviculture [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.95006.

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Tropical cloud forests play a fundamental role in the hydrological cycle of mountain watersheds having the largest biodiversity per unit area. In Venezuela, cloud forests are subject to intense deforestation and fragmentation by farming and cattle-ranching causing soil erosion, water cycle alteration, and biodiversity loss. Reforestation projects used exotic species as Pines and Eucalyptus, native species were rarely planted by lacking knowledge on species requirements and management. We report the performance of 25 native cloud forest species differing in shade-tolerance, planted in mixed assemblies on degraded areas. Tree survival and the individual tree variables: total height, root-collar diameter, tree-slenderness, and crown-ratio were evaluated at 1, 2, 4.5 and 7 years-old. Data was analyzed with a repeated measures analysis of variance mixed model considering species shade-tolerance, light intensity at planting and age as explanatory factors. Survival was over 80%. Shade-intolerant species displayed faster height and root-collar diameter growth. Shade-tolerant species had larger crown ratios due to persistence of lower branches; whereas, shade-intolerant showed signs of crown recession at age 7. Slenderness values from age 4.5 were indicative of good trees stability and health across treatments. The positive results have motivated landowners to establish native species plantations in critical areas with our support.
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"beam with a slenderness ratio of 10." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 115. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_21068.

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Takezawa, H., K. Ono, S. Okada, and K. Azumi. "Effect of Slenderness-Ratio Parameter on Seismic Performance of Steel Piers." In Maintenance, Safety, Risk, Management and Life-Cycle Performance of Bridges, 2160–64. CRC Press, 2018. http://dx.doi.org/10.1201/9781315189390-294.

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Lade, P., and Q. Wang. "Effect of slenderness ratio on shear banding in true triaxial tests on sand." In Numerical Models in Geomechanics, 148–54. Taylor & Francis, 2002. http://dx.doi.org/10.1201/9781439833797-c22.

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Reddy, S., and A. Stuedlein. "Effect of slenderness ratio on the reliability-based serviceability limit state design of augered cast-in-place piles." In Geotechnical Safety and Risk IV, 305–10. CRC Press, 2013. http://dx.doi.org/10.1201/b16058-44.

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Wang, Q. L., S. E. Qu, Y. B. Shao, and L. M. Feng. "STATIC BEHAVIOR OF AXIALLY COMPRESSED CIRCULAR CONCRETE FILLED CFRP-STEEL TUBULAR (C-CF-CFRP-ST) COLUMNS WITH MODERATE SLENDERNESS RATIO." In Volume 12 Number 3, 263–95. The Hong Kong Institute of Steel Construction, 2016. http://dx.doi.org/10.18057/ijasc.2016.12.3.4.

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Conference papers on the topic "Slenderness ration"

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Sachin, D., and Mallikarjuna Reddy. "Dynamic Modelling and Free Vibration Characteristics Analysis of Rotating Beams." In ASME 2021 Gas Turbine India Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gtindia2021-76426.

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Abstract Turbine blades are ideally modeled as cantilever beams on a disc rotating at a constant angular velocity. A study is made to understand the dynamic relationships between a rotating cantilever beam and various factors like hub radius, rotation speed, and slenderness ratio in in-plane vibration (Chordwise motion) and out-of-plane vibration (Flapwise motion). Hub is assumed to be rigid in the study. Using Hamilton’s principle, governing differential equations of movement for free vibration analysis of Euler-Bernoulli beam (EB) and Timoshenko (TB) beam under rotation are derived. The effects of the Gyroscopic couple are taken into account in the equations. The beam model is discretized using the Finite element approach. Derived differential equations are transformed into dimensionless quantities in which dimensionless parameters are identified. Under rotation, it is observed that the natural frequencies increase with the increase in rotational speed for both flapwise and chordwise motions of the beam. An interesting phenomenon is observed in the chordwise motion results, where Natural frequencies veer off at certain rotational speeds and certain modes. Slenderness ratios also influence this phenomenon, which shifts the veer-off region and the tuned angular frequency. Numerical results are obtained for different rotational speeds with various hub radius ratios, and it was observed that hub radius directly influences the natural frequencies of the rotating uniform cantilever beam. A thorough study on the influence of the slenderness ratio showed that, for lower slenderness ratio, frequency veering region occurs at the fundamental natural frequency, but for higher slenderness ratios’ there is a shift in frequency veering region for higher modes.
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Saghaee, Gholamreza, and Reza Noorzad. "Effects of Slenderness Ratio on Seismic Behavior of Vertical Micropiles." In Georisk 2011. Reston, VA: American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/41183(418)30.

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Fang, Zhenggang, Peng Huang, Kun Wu, Juan Mo, and Rui Liu. "Analysis of The Optimal slenderness ratio for Power Transmission Tower." In 2015 4th International Conference on Sustainable Energy and Environmental Engineering. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icseee-15.2016.22.

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Skinner, Ken, David W. Styles, and Sirous F. Yasseri. "Modelling of Offshore Tubular Members in Non-Linear Analyses." In ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2005. http://dx.doi.org/10.1115/omae2005-67035.

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This paper presents results of a study into calibrating beam elements properties for use in non-linear finite element analyses, such that the elements simulate the behaviour of real members. Following the API approach, it is recommended that the material strength is de-rated to achieve a well-behaved element. A large number of typical “imperfect” offshore tubular members were modelled using shell elements and analysed to determine the full range of their load-displacement behaviour. The complete practical range of combination of the slenderness and D/t (diameter to thickness) ratios were considered. Then the beam elements’ material was de-rated to achieve the same results as obtained from the shell model. The result of the study is a two-way table which gives the required de-rating as a function of the slenderness ratio and the D/t ratio.
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Falcão, Jonas, Rodolfo Carvalho, Renan Ribeiro, Ledymar Moreno, and José De Brito. "INFLUENCE OF SLENDERNESS RATIO IN THE MODAL ANALYSIS BY ANALYTICAL FORMULATION." In XI International Conference on Structural Dynamics. Athens: EASD, 2020. http://dx.doi.org/10.47964/1120.9010.19696.

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Roh, Jin-Ho, Eun-Jung Yoo, In Lee, and Jae-Hung Han. "Large Deformation Analysis of Inflated Membrane Boom Structures with Various Slenderness Ratios." In 48th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-1807.

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XU, Ge-Ning, Zhong-Yuan KANG, Heng YANG, Xin WANG, and Jing LI. "Nonlinear Stability Calculation Method of Crane Lattice Boom with Large Slenderness Ratio." In 3rd International Conference on Material Engineering and Application (ICMEA 2016). Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icmea-16.2016.96.

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Zhou, Hanwei, Ling Zhu, Shengming Zhang, and T. X. Yu. "Experimental Study on Ultimate Strength of Thin-Walled Square Tube Under Axial Compression." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-96134.

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Abstract There are many welded thin-walled square tube structures in ship structures. At present, researchers are mainly involved in axial compressive ultimate strength of square tubes with large aspect ratios. However, the study of square tubes with small aspect ratios on ultimate strength capacity have seldom been conducted. In order to study the ultimate strength capacity of thin-walled square tubes with small aspect ratio under axial compression, three welded thin-walled square tubes with different slenderness ratios were manufactured and studied in this paper. The ultimate strength of those models under axial compression were obtained experimentally. The experimental results were compared with numerical results performed by ABAQUS. The influence of slenderness ratios on the axial compressive ultimate strength of thin-walled square tubes is analyzed, and a feasible modelling of finite element method is proposed.
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MIMURA, K., T. UMEDA, M. YU, Y. UCHIDA, and H. YAKA. "EFFECTS OF IMPACT VELOCITY AND SLENDERNESS RATIO ON DYNAMIC BUCKLING LOAD FOR LONG COLUMNS." In Proceedings of the 9th AEPA2008. WORLD SCIENTIFIC, 2009. http://dx.doi.org/10.1142/9789814261579_0036.

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Datta, N., and Md Atif Siddiqui. "Dynamic Response of Axially Loaded Plates With Intermediate Fixities to Transient Hydrodynamic Impact Loads." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10443.

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A dynamic analysis of axially loaded plates with intermediate fixities is presented. The underwater part of a craft is modeled as a lightly damped flexible plate, which rises out of the water and slams against it at a large vertical velocity. This causes highly localized hydrodynamic impact pressure moving at high velocities across the plate, setting it into high-frequency vibrations. The natural frequencies of the plate depend on the slenderness ratio, aspect ratio, axial load, and end fixities. The end fixities depend on the quality of welding, and type of bracketing. Normal mode summation method is used to analyze the vibratory response, which is generated for various impact speeds, deadrise angles, end fixities, axial loads, aspect ratios, and slenderness ratios. A parametric study is done to predict the location, instant, and magnitude of the maximum dynamic stresses on the structure. The hydrodynamic pressure is assumed to act on the equilibrium position of the plate, i.e. one-way coupling of the fluid and the structure is studied. The primary aim is to study the time-varying dynamic stress configurations and draw conclusions leading to sound structural designs.
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Reports on the topic "Slenderness ration"

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Soliman, Amr A., and Omar A. Ibrahim. PANEL ZONE DESIGN FOR REDUCED BEAM SECTION MOMENT FRAMES CONSIDERING WEB SLENDERNESS RATIO OF BEAM. The Hong Kong Institute of Steel Construction, December 2018. http://dx.doi.org/10.18057/icass2018.p.132.

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AXIAL COMPRESSION BEHAVIOR OF SQUARE THIN-WALLED CFST COLUMN TO RC BEAM JOINTS. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.288.

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To investigate the influence of eccentricity ratio and slenderness ratio on the mechanical properties of eccentric compressed concrete filled steel tubular (CFST) lattice column, the ultimate bearing capacity tests of 20 K shape arrangement lacing strip of four-tube CFST columns were conducted. Based on the stress-strain relationship of CFST and the influence of shear deformation, the equilibrium equation of the mid-section is established and a numerical method for the ultimate bearing capacity of CFST lattice column is proposed. The slenderness reduction coefficient calculation model and equivalent slenderness ratio formula of CFST lattice column are established. Combined with the numerical results and the slenderness ratio reduction coefficient calculation model, the formula of slenderness ratio reduction coefficient is put forward. The comparison between theoretical analysis and experimental results shows that the calculation method of elastic-plastic ultimate bearing capacity of CFST lattice column proposed in this paper is quite accurate. The research outcomes can provide a reference for the application of CFST lattice column and revision of current specifications.
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CALCULATION METHOD OF ULTIMATE LOAD BEARING CAPACITY OF CONCRETE FILLED STEEL TUBULAR LATTICE COLUMNS. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.095.

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To investigate the influence of eccentricity ratio and slenderness ratio on the mechanical properties of eccentric compressed concrete filled steel tubular (CFST) lattice column, the ultimate bearing capacity tests of 20 K shape arrangement lacing strip of four-tube CFST columns were conducted. Based on the stress-strain relationship of CFST and the influence of shear deformation, the equilibrium equation of the mid-section is established and a numerical method for the ultimate bearing capacity of CFST lattice column is proposed. The slenderness reduction coefficient calculation model and equivalent slenderness ratio formula of CFST lattice column are established. Combined with the numerical results and the slenderness ratio reduction coefficient calculation model, the formula of slenderness ratio reduction coefficient is put forward. The comparison between theoretical analysis and experimental results shows that the calculation method of elastic-plastic ultimate bearing capacity of CFST lattice column proposed in this paper is quite accurate. The research outcomes can provide a reference for the application of CFST lattice column and revision of current specifications.
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EFFICIENCY OF DIFFERENT CONNECTIONS ON THE BEHAVIOUR OF COLD-FORMED SINGLE-ANGLE STEEL MEMBERS CONNECTED THROUGH ONE LEGUNDER AXIAL LOADING. The Hong Kong Institute of Steel Construction, September 2022. http://dx.doi.org/10.18057/ijasc.2022.18.3.10.

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A detailed experimental program was performed using 36 cold-formed steel (CFS) single-angle column members attached by one leg was investigated subjected to axial compression loads. The key purpose of this research is to investigate the effect of slenderness ratio and different connection types on the load-carrying capacity of CFS angle sections under axial compression. The parameters investigated via the test program includes (a) angle sections with and without lipped profile, (b) sectional thicknesses (2 mm and 3mm), (c) slenderness ratios (λ = 20, 50, 80) from short to slender columns, and (d) type of connections i.e. two-bolt, three-bolt and welded connections. Results shown that the angle sections had a significant reduction in the load-carrying capacity when the slenderness ratio was increased from 20 to 80. Moreover, the mode of failure for short columns was changed from local buckling mode to combined local and flexural buckling for intermediate columns (λ = 50) and torsional-flexural buckling mode for long columns (λ = 80). Also, a detailed analytical study was carried out comparing the predictability of existing equations from different standards for angle sections under axial compression.
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FINITE ELEMENT ANALYSIS ON BEHAVIOR OF HCFHST MIDDLE LONG COLUMNS WITH INNER I-SHAPED CFRP UNDER AXIAL LOAD. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.033.

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In this paper, the behavior of high-strength concrete filled high-strength square steel tube (HCFHST) middle long columns with inner I-shaped CFRP profile under axial load was studied. The finite element analysis models were established by ABAQUS software based on reasonable material constitutive relationship models. The whole process curve of load-deformation was analyzed. In addition, effects of concrete strength, steel yield strength, slenderness ratio, steel ratio and configuration ratio of CFRP on mechanical behavior of middle long columns were studied. On the basis of the parametric analysis, the limit slenderness ratio of middle long columns was obtained. Results show that with the increase of steel yield strength, the bearing capacity increases gradually, but ductility decreases. The higher the concrete strength is, the greater the ultimate bearing capacity is. Effect of steel ratio on the ultimate bearing capacity and ductility is relatively obvious. The ultimate bearing capacity of HCFHST middle long columns with inner I-shaped CFRP profile decreases with the increase of slenderness ratio.
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TEACHING-LEARNING BASED OPTIMIZATION METHOD CONSIDERING BUCKLING AND SLENDERNESS RESTRICTION FOR SPACE TRUSSES. The Hong Kong Institute of Steel Construction, March 2022. http://dx.doi.org/10.18057/ijasc.2022.18.1.3.

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The structural performance of a building is a function of several parameters and constraints whose association may offer non unique solutions which, however, meet the design requirements. Therefore, an optimization routine is needed to determine the best solution within the set of available alternatives. In this study, the TLBO method was implemented for weight-based optimization of space trusses. The algorithm applies restrictions related to the critical buckling load as well as the slenderness ratio, which are the basis to obtain reliable and realistic results. To assess the capability of the TLBO method, two reference cases and a transmission tower are subjected to the optimization analysis. In the transmission tower analysis, however, a more realistic approach is adopted as it also considers, through a safety factor, the plastic behavior in the critical buckling load constraint. With no optimization, the ideal weight increases by 101.36% when the critical buckling load is considered in the first two cases, which is consistent with the expected behavior. If the slenderness of the elements is also restricted, the ideal weight now rises by 300.78% from the original case and by 99.04% from the case where only the critical buckling load restriction is applied. Now, considering the critical buckling load and slenderness restriction with the TLBO method applied, a 18.28% reduction in the ideal weight is verified. In fact, the proposed optimization procedure converged to a better solution than that of the reference study, which is based on the genetic algorithms method.
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A SURROGATE MODEL TO ESTIMATE THE AXIAL COMPRESSIVE CAPACITY OF COLD-FORMED STEEL OPEN BUILT-UP SECTIONS. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.316.

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This paper proposed a surrogate model to simplify the process of estimating the axial compressive capacity of cold-formed steel (CFS) open built-up sections composed of lipped channels with different section sizes, thickness, length, and connector spacing. The surrogate model was developed based on the current design methods, i.e., the Effective Width Method (EWM) and Direct Strength Method (DSM), which are codified in the North American Specification AISI S100-16. This new model features two surface regression equations with a boundary inequality criteria, anchored on two important parameters, i.e., modified slenderness ratio, (KL/r)m and minimum thickness-to-width ratio (t/w)min of the built-up sections. The model was validated with 1089 sets of the experimental results data collected from previous research tested on the axial capacity of CFS open built-up sections with the different design configurations. The proposed surrogate model is aimed to simplify the design process among practising engineers for a quick preliminary calculation of the axial compressive capacity of these new CFS open built-up sections.
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LOCAL BUCKLING (WRINKLING) OF PROFILED METAL-FACED INSULATING SANDWICH PANELS – A PARAMETRIC STUDY. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.248.

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This study aims to investigate the effects of various parameters including the height of the profiling region, spacing of profiling ribs, length of the panel, thickness and modulus of the foam core, and thickness of the profiled face sheet, on the local buckling capacity of profiled metal faced insulating sandwich panels. A simplified finite element (FE) modeling approach that models the profiled face sheet as a folded plate structure resting on elastic foundation is adopted. This modeling approach was validated through comparison with tests results and 3D FE modeling of the entire sandwich structure in a previous study conducted by the authors. The two-parameter elastic foundation properties are determined using a modified nonlinear Vlasov foundation model. The results show that all the above-mentioned parameters play important roles in controlling the buckling capacity of the panel. However, the slenderness ratio of the panel is the most dominant parameter among all. Understanding the influence of each of the aforementioned parameters aids in the design process of such panels and provides insight into their local buckling response.
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RESEARCH ON CALCULATION METHOD OF LOADED COMPRESSION MEMBER OF SINGLE-LIMB FIRE-CURVED EQUILATERAL DOUBLE SPLICING T-SHAPED ANGLE STEEL. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.225.

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In this paper, loaded compression member of single-limb fire-curved equilateral double splicing T-shaped angle steel is compared with the calculation value of the bearing capacity of ordinary double-angle steel members in relevant domestic and foreign codes. When the slenderness ratio of members is large, the value obtained according to the steel structure design standard (GB 50017-2017) is closer to the test result. Based on the steel structure design standard (GB 50017-2017), the stability calculation method of axial compression members is presented in this paper. And based on the results of test and finite element analysis, the calculation formula of axial bearing capacity of single leg fire curved equal edge double splicing T-shaped angle steel members is modified. The calculation reduction coefficient of loaded compression member of single-limb fire-curved equilateral double splicing Tshaped angle steel is proposed. The revised calculation results of the axial bearing capacity of the members are in good agreement with the test results, which verifies the rationality of the formula.
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