偶数层平台连接双塔住宅结构地震响应特征分析

Analysis of Seismic Response Characteristics of Twin-Tower Residential Structure with Even-Floor Connecting Platforms

摘要: 本文以某22层钢筋混凝土框架–剪力墙住宅结构为研究对象，采用盈建科软件建立单塔独立模型和偶数层平台连接双塔整体模型，对两种模型的自振周期、楼层位移、层间位移角及内力响应进行对比分析。计算结果显示：双塔平台连接模型第一周期为1.4075 s，略大于单塔模型的1.3980 s；X向顶部位移较单塔模型增加约7.5%，Y向顶部位移较单塔模型减小约1.4%；X向和Y向最大层间位移角分别为1/1212和1/1079，均满足弹性层间位移角限值1/800的要求。双塔模型基底剪力较单塔模型明显增大，Y向框架柱倾覆力矩占比由0.9%提高至7.8%，说明平台连接对框架–剪力墙协同工作性能具有一定影响。分析表明，偶数层平台连接会改变双塔住宅结构的地震响应特征，设计中应重点关注平台楼层及其相邻楼层的变形和内力变化。

Abstract: This paper takes a 22-story reinforced concrete frame-shear wall residential structure as the research object. A single-tower model and a twin-tower overall model with even-floor connecting platforms are established using YJK software, and their natural vibration periods, floor displacements, inter-story drift ratios, and internal force responses are compared. The results show that the first period of the twin-tower model is 1.4075 s, slightly larger than 1.3980 s of the single-tower model. The top displacement of the twin-tower model increases by about 7.5% in the X direction and decreases by about 1.4% in the Y direction compared with the single-tower model. The maximum inter-story drift ratios in the X and Y directions are 1/1212 and 1/1079, respectively, both satisfying the elastic drift limit of 1/800. The base shear of the twin-tower model is significantly larger than that of the single-tower model, and the Y-direction overturning moment ratio carried by frame columns increases from 0.9% to 7.8%, indicating that the connecting platforms have a certain influence on the cooperative behavior of the frame-shear wall system. The analysis indicates that even-floor connecting platforms can alter the seismic response characteristics of twin-tower residential structures, and the deformation and internal force variations of platform floors and their adjacent stories should be carefully considered in design.