适用于套建增层的单跨双层钢框架滞回性能与设计建议

In order to study the seismic performance of single span double-layer steel frame, the slenderness ratio, axial compression ratio and the loading position for the parameters, design 18 groups of single span double-layer steel frame system. Mechanical constitutive relations model and material based on a simplified, using ABAQUS software to establish the corresponding finite element model, static analysis of frame structure under action of monotonic horizontal load under development. Through the simulation analysis and the single span double-layer steel frame test results, two good agreement, to verify the rationality of the finite element model is established in this paper. The further development of 18 sets of single span double-layer steel framework based on nonlinear analysis, were compared to extract the load displacement hysteretic curves and skeleton curves, the envelope and the energy equivalent method, calculated based on the structural ductility factor, in addition the structure system of plastic hinges appear successively and distribution. The results show that: the single span double-layer steel frame structure plump hysteretic curve, ductility, energy dissipation and plastic performance, the formation of strong column and weak beam plastic hinge mechanism. Finally, design recommendations for tapping in the framework of the long-span, heavy load and jacketing in engineering in seismic region, for new and renovation of existing buildings to provide technical support.