某大跨转换桁架高层钢结构设计

The Design of a High-Rise Steel Structure with Large-Span Transfer Trusses

阐述了上海某大跨转换桁架高层钢结构设计思路。根据该工程的体型特点,对比了多种不同的转换结构方案,综合考虑各种因素最终选择“下托式”的主、次桁架转换方案。计算结果表明,采用该方案的结构整体指标满足规范要求,具有足够的抗侧刚度。在转换桁架设计中考虑了次框架的空腹桁架效应、活荷载不利布置和抗连续倒塌等因素影响;对转换层的楼板应力及转换桁架钢结构关键节点进行了有限元分析,并提出了相应的加强措施;通过施工模拟分析评估了施工顺序对整体结构的影响。该项目的设计过程及方法可为类似项目提供参考。

This paper describes the design of a high-rise steel structure with large-span transfer in Shanghai.Based on the characteristics of the building,different transfer schemes are compared in the paper.Considering all the factors,a lower-lifted transfer structural scheme with primary and secondary truss is adopted in the design.The analysis results show that the overall structural performance meets the requirements of the design standard.The structure has enough lateral stiffness.In the design of the transfer truss,the vierendeel truss effect of the secondary frame,the unfavorable distribution of the live load and the resistance of progressive collapse are considered.The stress of the transfer floor slab and the critical joints of the transfer truss are analyzed using finite element analysis.Strengthening measures are proposed.The influence of the construction consequence on the overall structure is evaluated by the construction consequence analysis.The design process and method can provide a reference to similar projects.