Abstract

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Title:: Nonlinear Analysis of Mechanical Property for Steel Reinforced Concrete Composite Frame Structure

Author(s):: Nonlinear Analysis of Mechanical Property for Steel Reinforced Concrete Composite Frame Structure; School of Civil Science and Engineering, Yangzhou University

Keywords:: steel reinforced concrete beam; anglesteel concrete column; finite element; mechanical property; ultimate load

Abstract:: A finite element model (FEM) to simulate the composite frame structure composed of prestressed (nonprestressed) steel reinforced concrete beam and anglesteel concrete column under horizontal loading was developed by considering concrete damage, material nonlinearity and element type, and the mechanical properties acquired from FEM were compared to test results. According to FEM, the whole force process of composite frame structure under horizontal loading was studied, and the primary factors affecting the mechanical property of the frame structure were analyzed. The results show that the plastic hinges occur at the beam ends and column bottoms, and the failure mechanism of “strongcolumn and weak column” can be reached. Furthermore, with increasing of the axial compression ratio, the ultimate load of horizontal loaddisplacement curves increases firstly and then decreases, corresponding to the displacements decrease and ductilities depress; with increasing of slenderness ratio, the stiffness of structure decreases, the ultimate load reduces and the ductility gets better.