高层组合框架-混凝土筒体结构推覆分析

针对高层混合结构中适用于推覆分析的剪力墙单元与型钢混凝土构件塑性铰等问题进行研究,利用三垂直杆元模拟剪力墙,各杆元分别考虑剪力墙轴向、剪切与弯曲变形;根据型钢混凝土构件截面承载力与变形能力,给出了反映截面弯矩与转角关系的型钢混凝土构件塑性铰特性值计算方法;应用MIDAS/GEN软件作为弹塑性分析工具,采用改进的剪力墙单元模型,自定义型钢混凝土构件塑性铰特性值,对30层高混合结构进行推覆分析,并与模型试验结果对比,结果表明：推覆分析所得基底剪力-顶点位移曲线与试验结果较符合,各构件塑性铰分布及状态与模型试验的裂缝分布及破坏模式符合较好,能够反映出混合结构各构件变形和结构整体承载力变化过程.

Push-over analysis of reinforced concrete core and composite frame hybrid structure in high-rise buildings

The shear wall element model suitable for push-over analysis and the constitutive relationship for plastic hinge of steel reinforced concrete members were both studied.The three vertical truss element models were used to simulate shear wall,in which axial,shear and bend deformations are considered.The method specifying the plastic hinge property for reflecting relationship between moment and rotation of steel reinforced concrete beams was proposed.The push-over analysis for a 30-story hybrid structure was carried out by the MIDAS/GEN software where three vertical truss element models were used for simulation shear walls,the plastic hinge property of steel reinforced concrete beams were defined by user.The comparison between the test results with push-over analysis for the model structure shows that the base shear-top displacement curve from push-over analysis is in good agreement with the experimental results,and the distribution and states of plastic hinge are consistent with the distribution and failure modes of crack in test,the deformation of members and bearing capacity of hybrid structure can be reflected by the push-over analysis.