连体高层大跨钢连廊设计关键技术分析

Analysis on key issues for design of large⁃span steel corridors in connected tall building

以实际工程项目为背景,针对多塔连体高层大跨钢连廊设计中存在的关键技术问题,对多塔弱连接体结构进行了整体弹性和弹塑性分析,研究了大跨钢连廊对塔楼受力和抗震性能的影响以及连廊自身振动特性和振动控制方案。结果表明,采用弱连接方案来降低大跨钢连廊对各塔楼的影响是合理可行的解决方案;对与连廊采用滑动支座连接一端的塔楼,其独立塔楼和整体模型的动力特性和地震响应基本一致,塔楼可按独立塔楼模型计算结果进行设计;对与连廊采用固定铰支座连接一端的塔楼,其独立塔楼和整体模型的动力特征和地震响应有较大差异,应考虑连廊对抗震性能的影响,按整体模型和独立塔楼模型计算结果进行包络设计;连廊支座布置方案和选取的抗震支座实现了预期弱连接设计理念,满足大震下变形需求;采用TMD减振控制的大跨钢连廊在人群荷载激励下的竖向振动加速度响应减小显著,减振率达到70%,减振后竖向振动加速度满足规范要求。

Based on the actual project,aiming at the key technical problems in the design of multi-tower conjoined large-span steel corridors,the overall elasticity and elastoplastic analysis of the multi-tower weak-connected structure were carried out,the influence of the large-span steel corridor on the mechanical and seismic behavior of the tower,as well as the vibration characteristics and vibration control of the corridor were studied.The results show that it is a reasonable and feasible solution to use the weak-connected scheme to reduce the influence of the connection body on each tower.For the tower connected to the corridor by sliding bearings,the dynamic characteristics and seismic response of the independent and overall models are basically the same,and the design can be carried out according to the calculation results of the independent model.For the tower connected to the corridor by fixed hinge bearings,the dynamic characteristics and seismic response of the independent and overall models are quite different.Hence,the influence of the corridor on the seismic behavior should be considered,and the envelope design should be carried out according to the calculation results of the overall model and the independent model.The layout and selection of bearings in the corridor realize the expected weak-connected design concept and meet the deformation requirements under severe earthquake.The vertical vibration acceleration response of the long-span steel corridor using TMD is significantly reduced under the excitation of crowd load,the vibration reduction rate reach 70%,and the vertical vibration acceleration meets the requirements of the specification.