应用隔震楼梯的梁端铰型自复位框架地震响应
鲁亮1 陈甲1 覃石刚2 任祥香1
1. 同济大学 土木工程防灾减灾全国重点实验室/结构防灾减灾工程系，上海 200092；
2. 广州市工业和信息化局，广东 广州 510032
Seismic Response of Beam-End Hinged Self-Centering Frame Structure with Isolated Stairs
LU Liang1 CHEN Jia1 QIN Shigang 2 REN Xiangxiang1
1.State Key Laboratory of Disaster Reduction in Civil Engineering/ Department of Disaster Mitigation for Structures, Tongji University, Shanghai 200092, China;
2. Guangzhou Municipal Industry and Information Technology Bureau, Guangzhou, Guangdong 510032, China
To assess the performance of seismically isolated staircases in self-centering frame structures, a four-story controlled rocking reinforced concrete frame (CR-RCF) is chosen for analysis. Finite element models of the frames are created, featuring staircases with different designs. The dynamic responses of these models are compared under both frequent and rare seismic events. The findings revealed that during frequent earthquakes, the maximum inter-story drift ratio for models with sliding staircases and rubber bearing staircases are about twice that of the fixed staircase model. However, the base shears are decreased by 37% and 43%, respectively. In the case of rare earthquakes, the base shear reductions are reduced by 45% and 34% for the sliding and rubber bearing staircases, highlighting their effectiveness in reducing the structure's dynamic response. Additionally, during rare seismic events, the maximum inter-story drift ratio for the rubber bearing staircase are two to three times higher than that of the fixed staircase, while the maximum sliding displacement is significantly below design limit, confirming its safety and reliability in extreme seismic situations. This research offers an initial investigation on the selection of staircases in self-centering frame structures, demonstrating that both rubber bearing staircases and sliding staircases are suitable for these types of structures, effectively safeguarding the main structure from severe damage and improving the overall seismic performance and safety of the building. Consequently, it is advised to prioritize rubber bearing staircases or sliding staircases in the design of self-centering frame structures to enhance their seismic safety.
self-centering structure; isolated stairs; finite element analysis; dynamic time-history analysis
摘要：
为评估隔震楼梯在自复位框架结构中的应用效果，选取受控摇摆式钢筋混凝土框架（CR-RCF）为研究对象，建立了四层自复位框架结构的有限元模型，并配置不同构造形式的楼梯，对比分析四种模型在多遇地震和罕遇地震作用下的动力响应。研究表明，在多遇地震下，相较于固定楼梯模型，滑动楼梯和橡胶隔震支座楼梯的最大层间位移角约为其两倍、基底剪力分别降低37%和43%。在罕遇地震作用下，两类隔震楼梯的基底剪力降幅达45%和34%，表明其能有效减小结构地震动力响应。此外，罕遇地震下，隔震支座楼梯的最大层间位移角分别为固定楼梯的2倍和3倍以上，但最大滑动位移低于设计限值，验证了其在极端地震条件下的安全性与可靠性。本研究在自复位框架结构中楼梯选型方面进行了初步探索，证实了橡胶支座楼梯和滑动支座楼梯能够较好地适配自复位框架结构，有效保护主体结构免受严重损伤，从而提高建筑物的整体抗震性能和安全性。因此，建议在自复位框架结构设计中，优先考虑采用橡胶支座楼梯或滑动支座楼梯，以提升结构的抗震安全水平。
