| A composite steel frame-reinforced concrete infill wall(SRCW),in which the steel and concrete components work integrally through mechanical connectors,obtains virtues of steel frame and shear wall.This structure is considered to be a promising anti-seismic structural style.In this paper,finite element model is built to simulate fully restrained steel frame with infill reinforced concrete wall structure.SAP programs is used in this paper,the model is subjected to step to step horizontal load,during elastic deflection the curve of load-deflection and the horizontal stiffness are obtained.In the paper,SRCW is simplified to steel frame with crossed steel braces,by analyzing different model and the corresponding simplified model, the simplified model,method for simplifying,parameters for simplifying and the formula of simplifying are given in this paper.Some reference of this structure style is supplied for engineering;using FEM program ANSYS to conduct no-linear analyze for this structure style, to study its breakage style and stiffness variety during optimal condition.Finally,a project is designed to discuss how to use this simplified model to design.Specific tasks are written bellow:(1) Investigations are conducted to analyze the current situation of studying for SRCW system.(2) By academic analyzing,initial calculation formula for simplified steel frame with crossed steel braces is given.(3) Same specimens are designed and analyzed to checkout the accuracy of the formula.(4) Errors during simplifying are analyzed,and the formula is also modified,then the errors of the modified formula are analyzed.(5) Nonlinear finite analysis is conducted of a specimen to analyze how the cracks happen and the breakage style of this system during specified conditions.(6) Analysis and design are conducted for a real project through this simplified model. (7) Some conclusions are given at last.
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