【摘要】 通过1榀缩尺比为1/2.5的两跨三层的空腹式型钢混凝土(SRC)异形柱中框架在水平反复荷载作用下的试验研究,获得其荷载-位移滞回曲线及最终破坏形态,分析其结构延性、层间位移角及耗能性能。结果表明,空腹式SRC异形柱中框架滞回曲线饱满,弹塑性层间变形能力强,延性及耗能能力良好。基于试验研究结果,采用ABAQUS软件对该结构进行了非线性有限元分析,研究空腹式SRC异形柱框架的承载力、刚度退化以及出铰机制。有限元分析得出的结果与试验实测结果吻合较好;在此基础上对该结构进行参数分析,研究轴压比、混凝土强度、型钢屈服强度、柱肢高肢厚比、梁柱线刚度比以及梁柱屈服弯矩比等参数对其力学性能的影响。结果表明:增大混凝土强度、柱肢高肢厚比、梁柱线刚度比以及梁柱屈服弯矩比,能够提高结构的水平承载力和弹性刚度,但对结构延性的影响不大;随着轴压比和型钢屈服强度的增大,结构弹性刚度均变化不大,但增大轴压比,结构水平承载力和延性均降低,增大型钢屈服强度,能够同时提高结构水平承载力和延性。更多还原

【Abstract】 Based on the experimental study on a 1/2.5-scaled model of two-bay and three-story middle frame consisting of reinforced concrete beams and lattice steel reinforced concrete(SRC) special-shaped columns under low cyclic reversed loading,the load-displacement hysteretic loops and the final failure mode of the structure were obtained.The ductility,inter-story drift and energy dissipation of the structure were analyzed.The results show that the hysteretic loops are in a plump-shape,the capacity for elastic-plastic inter-story deformation is high,and the ductility and energy dissipation of the structure are good.Based on the previous experimental study,nonlinear finite element models were used to analyze the mechanical properties of the structure using ABAQUS.The load-displacement curves,stiffness degradation and subsequence of plastic hinges were investigated.The finite element analysis results agree with the experiments.Parametric analysis of the structure was carried out based on the theoretical analysis.The axial compression ratio,concrete strength,yield strength of steel,limb height-thickness ratio,stiffness ratio of beam to column and yield bending moment of beam to column were all considered as analysis parameters.The results show that: with the increment of the concrete strength,limb height-thickness ratio,stiffness ratio of beam to column and yield bending moment of beam to column,the horizontal load-bearing capacity and the elastic stiffness of the structure are improved,but there is no significant effect on the ductility.With the increment of the axial compression ratio and the yield strength of steel,there is no obvious change in the elastic stiffness of the structure,but the horizontal load-bearing capacity and the ductility of the structure decreased with the increment of the axial compression ratio;with the increment of the yield strength of steel,the horizontal load-bearing capacity and the ductility of the structure are improved.更多还原