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http://dx.doi.org/10.12989/smm.2022.9.1.081

Nonlinear numerical analysis and proposed equation for axial loading capacity of concrete filled steel tube column with initial imperfection  

Ahmad, Haseeb (FAST-National University of Computer and Emerging Sciences)
Fahad, Muhammad (Department of Civil Engineering and Environmental Engineering, Saitama University)
Aslam, Muhammad (Department of Civil Engineering, School of Engineering & Technology, Institute of Southern Punjab)
Publication Information
Structural Monitoring and Maintenance / v.9, no.1, 2022 , pp. 81-105 More about this Journal
Abstract
The use of concrete filled steel tube (CFST) column is widely accepted due to its property of high axial load carrying capacity, more ductility and more resistant to earthquake specially using in bridges and high-rise buildings. The initial imperfection (δ) that produces during casting or fixing causes the reduction in load carrying capacity, this is the reason, experimental capacity is always less then theoretical one. In this research, the effect of δ on load carrying capacity and behavior of concrete filled steel tube (CFST) column have been investigated by numerically simulation of large number of models with different δ and other geometric parameters that include length (L), width (B), steel tube thickness (t), f'c and fy. Finite element analysis software ANSYS v18 is used to develop model of SCFST column to evaluate strength capacity, buckling and failure pattern of member which is applied during experimental study under cyclic axial loading. After validation of results, 42 models with different parameters are evaluated to develop empirical equation predicting axial load carrying capacity for different value of δ. Results indicate that empirical equation shows the 0 to 9% error for finite element analysis Forty-two models in comparison with ANSYS results, respectively. Empirical equation can be used for predicting the axial capacity of early estimating the axial capacity of SCFT column including 𝛿.
Keywords
ANSYS; concrete filled steel tube column; finite element analysis; modelling; parametric study;
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