隔震防倒塌支座及楼梯间位置对框架结构抗震性能的影响研究
Influence of Isolation and Collapse Prevention Bearings and Locationof Stairwells on the Seismic Performance of Frame Structures

为研究梯段板下端设置隔震防倒塌支座和楼梯间位置对钢筋混凝土框架结构抗震性能的影响，利用ETABS软件建立不包括、包括隔震防倒塌支座的3种楼梯间布置方案，6个框架结构计算模型。通过模态分析、反应谱分析和Pushover分析，研究隔震防倒塌支座和楼梯间位置对框架结构的振型、内力及破坏机制的影响。结果表明：梯段板下端设置隔震防倒塌支座后，楼梯间位置对钢筋混凝土框架结构的扭转效应影响较小，且框架结构在两个主轴方向的动力特性比较接近；楼梯间框架柱内力均显著降低，但楼梯间布置在最边跨时，在垂直于梯跑方向地震作用下，框架结构边柱内力较大；框架梁对整体框架结构的耗能贡献较多，增强了框架结构的抗震性能，大震时楼梯构件严重破坏较晚，设置隔震防倒塌支座可保证楼梯整体稳定性。
To study the influence of isolation and collapse prevention bearings at the end of a stair plate and location of the stairs on the seismic performance of reinforced concrete frame structures, three groups and six models including isolation collapse prevention supports were built using the ETABS software. The effect of frame structures with isolation and collapse prevention bearings and stairwell location on the vibration, internal force, and failure mechanism were analyzed by modal analysis, response spectrum analysis, and pushover analysis. The calculation results show that the location of the stairwell has little impact on torsion of the frame structures after adding isolation and collapse prevention bearings, and the vibration in the two major axes directions of the frame structure is similar, that is, the internal force of the stair columns is significantly reduced. When the layout of the stairwells is in the side span, the internal force of the stair columns is stronger when the frame is subjected to an earthquake in the direction perpendicular to the ladder. The frame beams have improved the structural seismic performance by dissipating the earthquake energy. The overall stability of the stairs can be guaranteed with the isolation and collapse prevention bearings, and the failure of the stairs is delayed during a major earthquake.