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http://dx.doi.org/10.7734/COSEIK.2017.30.3.255

Material and Geometric Nonlinear Analysis of Plane Structure Using Co-rotational Fiber-section Beam Elements  

Kim, Jeongsoo (Structural Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
Kim, Moon Kyum (Department of Civil and Environmental Engineering, Yonsei University)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.30, no.3, 2017 , pp. 255-263 More about this Journal
Abstract
This paper presents a beam element capable of conducting material and geometric nonlinear analysis for applications requiring the ultimate behavioral analysis of structures with composite cross-sections. The element formulation is based on co-rotational kinematics to simulate geometrically nonlinear behaviors, and it uses the fiber section method to calculate the stiffness and internal forces of the element. The proposed element was implemented using an in-house numerical program in which an arc-length method was adopted to trace severe nonlinear responses(such as snap-through or snapback), as well as ductile behavior after the peak load. To verify the proposed method of element formulation and the accuracy of the program that was used to employ the element, several numerical studies were conducted and the results from these numerical models were compared with those of three-dimensional continuum models and previous studies, to demonstrate the accuracy and computational efficiency of the element. Additionally, by evaluating an example case of a frame structure with a composite member, the effects of differences between composite material properties such as the elastic modulus ratio and strength ratio were analyzed. It was found that increasing the elastic modulus of the external layer of a composite cross-section caused quasi-brittle behavior, while similar responses of the composite structure to those of homogeneous and linear materials were shown to increase the yield strength of the external layer.
Keywords
geometric nonlinearity; material nonlinearity; fiber section; co-rotational formulation; ultimate analysis; composite;
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Times Cited By KSCI : 5  (Citation Analysis)
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