高层装配式斜支撑钢框架结构设计研究

针对远大S30工程的高层装配式斜支撑钢框架结构体系，分别采用振型分解反应谱法和线性时程分析法对整体结构进行有限元分析，得到了结构在多遇地震作用下的内力和位移响应。进行了结构整体的弹性设计，总结了该结构体系的设计方法。按规范对柱与柱座法兰连接的承载力进行了计算，并通过有限元分析和试验研究进行了节点强度和刚度的分析与验证。对梁柱节点进行了试验，研究其刚度变化规律，提出了采用弹簧单元在整体结构中建立节点简化分析模型的方法。研究结果表明：该体系中轻型钢楼梯对整体刚度的影响可以忽略，计算时可不建模分析；结构抗震性能满足现行规范要求，结构侧向变形曲线介于框架结构和剪力墙结构变形曲线之间；斜支撑降低了节点区的应力，增大了结构体系刚度，起到了减小柱计算长度、增强梁柱节点和柱与柱座连接的作用；柱与柱座法兰连接设计既满足设计强度要求，又实现了柱的刚性连接，保证了柱承载力和刚度的连续性。

Design study on a high-rise prefabricated steel frame structure with inclined braces

Aiming at the design of the high-rise prefabricated steel frame with inclined braces, which was applied in the S30 project of Broad Group, the methods of mode-superposition response spectrum and time history analysis were used for the finite element numerical simulation of the whole structure, and the stress and displacement responses under frequent earthquakes were obtained. The elastic design of the whole structure was performed and the design methods are summarized in the paper. The bearing capacity of column-column seat flange plate connection was designed according to specifications, and the strength and stiffness of the connection were analyzed and tested by finite element analysis and model test. The model test of beam-column joint was performed, and the stiffness changing law was obtained. The method of building simplified analysis model of beam-column joint by spring element for whole structure analysis was proposed. The structural design, numerical simulation and model test results show that the influence of steel stair to stiffness of the whole structure could be ignored, there is no need to build stair model in the whole structure. The seismic performance of this new-type structure system satisfies the requirements of current specifications, and its lateral deformation curve locates between those of frame and shear wall structures. The inclined braces decrease the stress within the connection region, increase the stiffness of the structure, and play a role of reducing the calculation length of column and protecting the column-column seat connection and beam-column connection. The column-column seat flange plate meets strength requirement and behaves as rigid connection, the continuity of strength and stiffness of column is guaranteed.