Abstract
Concrete-filled tubular (CFT) column improves the structure properties under different load pattern, so that it should be designed under two main load patterns (static and cyclic load) using current design method such as Finite Element Method (FEM) and analytical method (guideline equation). In this research, a CFT column with specific dimensions is modeled by using ABAQUS finite element software; the target of this study is to conduct a pushover analysis and also a hysteresis analysis under cyclic loading. Then, the concrete grade and percentage of column reinforcement were altered using the FEM, and eventually, compared with the results of analytical equations to measure the safety level of analytical equations. For this purpose, the CFT columns with C20, 30, 40 & 50 concrete cores were modeled with and without reinforcement, and the effect of concrete grade on the capacity of column was studied. In addition, MATLAB software was used to obtain beta index and load capacity design for the CFT column. The results demonstrated that the columns designed in accordance with the AISC have a good performance under the cyclic and static loading. The safety level of design equations ranged between 3 and 5, and the columns could resist higher loads (about 2.5-3.5 times) through the design by ABAQUS.
Highlights
The steel sections filled by various grades of concrete with different heights and various compounds are used as column and beam-column in different types of structures
The effect of concrete grade and reinforcement bar were investigated on the performance of concrete-filled tubular (CFT) columns
The result of this study indicates that total displacement (U) increases with increment of concrete grade as well as capacity of column while the stress of CFT decreases
Summary
The steel sections filled by various grades of concrete with different heights and various compounds are used as column and beam-column in different types of structures. The modulus of elasticity, moment of inertia and effective surface in tensile loading are quite clear in steel, while it is difficult to estimate these parameters in concrete because of heterogeneity. The concrete strength, tensile cracking and prolonged loading effects, among others, have a greater effect on the concrete specifications [1]. Ehab Ellobody (2006) examined the behavior and design strength of circular CFT columns under axial loads. This research aimed to investigate the effect of concrete compressive strength (f'c) and ratio of diameter to wall thickness (D/t) using the concrete with a compressive strength of 30-110 MPa and the sections with D/t ratio of 15-80. The comparison of the strength obtained from the numerical analysis performed in this study with the design strength calculated using the US, Australian and European codes showed that comparing the European
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