不同形式楼梯对框架结构的抗震影响分析

Comparison analysis of the earthquake-resistance performance of frames with different staircases

为研究不同形式现浇板式楼梯对框架结构抗震特性的影响,采用三种不同构造形式的楼梯,通过建立计入和不计入楼梯的四种不同框架结构模型并用GSSAP软件计算分析,得到了框架结构整体动力特性和楼梯及相关构件特性。计算结果表明,不同形式楼梯对框架结构各方面影响程度不同,楼梯自身力学性能也有较大差别,整体与结构相连的楼梯比一端与结构分离的楼梯在对结构整体地震反应及楼梯间构件内力方面影响较大,建议在设计中采用与框架结构分离的楼梯方案。

In order to study the seismic performance of frame structure based on different stairs,three staircases of different configurations,four different frame structure models,with and without staircases,are established and analyzed by GSSAP. The paper obtains the frame structures ' whole dynamic property and the property of staircase as well as periphery elements. The results show that the effects of frame structures with different staircases on the influence are also different, the mechanical properties of staircases are great differences. Staircase connected to the structure has a greater impact on seismic performance and internal force of members when compared with isolated staircases. The paper proposes that the staircase isolated from frame structure should be use in the structural design.