【摘要】 以钢管混凝土柱框架—混凝土核心筒结构为背景,将钢管混凝土柱、钢框架梁、核心筒之间的刚性连接改为螺栓铰接,形成钢管混凝土重力柱—混凝土核心筒结构。运用有限元软件Canny建立数字模型,对新型结构进行3种不同侧向加载模式的pushover分析,根据能力谱法求出7度大震作用下的性能点,并与动力时程分析结果对比,得出倒三角形加载模式精度更高。进一步研究结构塑性铰发展过程,指出结构中部区段为薄弱层,核心筒连梁和底部剪力墙为薄弱部位,应加强抗震构造。更多还原

【Abstract】 Based on an actual concrete-filled steel tube(CFST) frame column-reinforced concrete(RC) core tube structure,the rigid joints between the steel frame beam,the CFST column and the core tube are changed into bolt hinges to form CFST gravity column-RC core tube structure. The finite element software Canny is used to establish a digital model, and the new structure was subjected to the pushover analysis of three different lateral loading modes. According to the capacity spectrum method, the performance points under the 7 degree earthquake are obtained, and compared with the dynamic time history analysis, the results show that the inverted triangle loading mode has higher accuracy. Further study on the development process of structural plastic hinge points out that the middle section of the structure is the weak layer,and the core tube coupling beam and the bottom shear wall are the weak parts,so the seismic structure should be strengthened.更多还原