Abstract
Basic information regarding the mechanical performance of concrete-filled steel tubular/concrete filled double skin steel tube (CFST/CFDST) columns obtained from experimental tests has been used to develop numerical methods. These numerical models can ease the prediction of the behavior of CFST/CFDST columns with reasonable accuracy. Additionally, the recent advances in computers' capacities have eased the use of finite element software in conducting structural members' analytical and numerical analyses. Defining models that can precisely define the behavior of materials is a fundamental step in executing analytical techniques. In this chapter, constitutive models or predicting the stress and strain are expressed. Besides, models for assessing the impacts of concrete creep on the behavior of the confined concrete are explained. Also, several models for computing the stress–strain response of composite columns under axial compression are covered.
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