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RISS 인기검색어
- 검색키워드
- 저자 : Keerthan Poologanathan (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Shear Buckling Characteristics of Cold-formed Steel Channel Beams
Poologanathan Keerthan,Mahen Mahendran 한국강구조학회 2013 International Journal of Steel Structures Vol.13 No.3
Cold-formed steel members are increasingly used as primary structural elements in the building industries around the world due to the availability of thin and high strength steels and advanced cold-forming technologies. Cold-formed lipped channel beams (LCB) are commonly used as flexural members such as floor joists and bearers. However, their shear capacities are determined based on conservative design rules. For the shear design of LCB web panels, their elastic shear buckling strength must be determined accurately including the potential post-buckling strength. Currently the elastic shear buckling coefficients of LCB web panels are determined by assuming conservatively that the web panels are simply supported at the junction between their flange and web elements. Hence finite element analyses were conducted to investigate the elastic shear buckling behavior of LCBs. An improved equation for the higher elastic shear buckling coefficient of LCBs was proposed based on finite element analysis results and included in the ultimate shear capacity equations of the North American cold-formed steel codes. Finite element analyses show that relatively short span LCBs without flange restraints are subjected to a new combined shear and flange distortion action due to the unbalanced shear flow. They also show that significant post-buckling strength is available for LCBs subjected to shear. New equations were also proposed in which post-buckling strength of LCBs was included.
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Elilarasi Kanthasamy,Husam Alsanat,Keerthan Poologanathan,Perampalam Gatheeshgar,Marco Corradi,Muhammad Rahman,Kajaharan Thirunavukkarasu 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.4
Cold-Formed Steel (CFS) sections are vulnerable to certain local and global failures, especially web crippling failures. CFS beams are generally employed in construction practices mainly as floor joists or bearers. The design standards, AISI S100, AS/NZS 4600 and Eurocode 3 Part 1–3 predict the web crippling capacity of CFS sections according to the experimental studies conducted in previous years. In most of the cases, the predictions of the equations were unsafe and hence innovative concepts of CFS should be examined undergoing web crippling. Therefore, the web crippling behaviour of the unlipped channel sections with high-strength material under Interior-Two-Flange (ITF) loading condition was investigated in this study by following the AISI S909 standard test method defined for web crippling. Numerical simulations using Finite Element Analysis (FEA) software (ABAQUS) were conducted on 243 parametric studies to replicate the loading conditions of ITF following a proper validation. Parametric study data were then taken into account to determine the accuracy of existing equations for web crippling capacity in the design standards and existing literature. Since the available design equations were conservative or unsafe and considering the empirical nature of CFS sections in terms of web crippling capacity, new modified equations were proposed to predict the ultimate web crippling capacity of high-strength unlipped channel sections and a new design approach based on the Direct Strength Method (DSM) was also developed.
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Armin Memarzadeh,Amir Ali Shahmansouri,Keerthan Poologanathan 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.44 No.3
The post-fire elastic stiffness and performance of concrete-filled steel tube (CFST) columns containing recycled aggregate concrete (RAC) has rarely been addressed, particularly in terms of material properties. This study was conducted with the aim of assessing the modulus of elasticity of recycled aggregate concrete-filled steel tube (RACFST) stub columns following thermal loading. The test data were employed to model and assess the elastic modulus of circular RACFST stub columns subjected to axial loading after exposure to elevated temperatures. The length/diameter ratio of the specimens was less than three to prevent the sensitivity of overall buckling for the stub columns. The gene expression programming (GEP) method was employed for the model development. The GEP model was derived based on a comprehensive experimental database of heated and non-heated RACFST stub columns that have been properly gathered from the open literature. In this study, by using specifications of 149 specimens, the variables were the steel section ratio, applied temperature, yielding strength of steel, compressive strength of plain concrete, and elastic modulus of steel tube and concrete core (RAC). Moreover, parametric and sensitivity analyses were also performed to determine the contribution of different effective parameters to the post-fire elastic modulus. Additionally, comparisons and verification of the effectiveness of the proposed model were made between the values obtained from the GEP model and the formulas proposed by different researchers. Through the analyses and comparisons of the developed model against formulas available in the literature, the acceptable accuracy of the model for predicting the post-fire modulus of elasticity of circular RACFST stub columns was seen.
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