上海徐家汇中心北裙房TOD开发项目结构技术解决方案探讨

Discussion on structural technology solution of TOD development project of north podium in Shanghai Xujiahui Centre

上海徐家汇中心系典型的交通引导开发类项目,其北裙房建筑单体大部分区域位于地铁隧道上方或地铁50m保护区域内,地基承载限制是主要结构技术瓶颈。以该工程为研究案例,通过阐述克服地基承载限制的若干结构技术解决方案,包括选用轻质高强的结构体系、结构传力路径回避地基限制区、桩筏基础计算概念调整、减少工程无效附加荷载等技术方案,并结合弹性时程分析、罕遇地震下的弹塑性静力分析、屋面桁架系统构件验算等以佐证本工程抗震性能目标的可实现性与结构体系的可靠性,为交通引导开发类项目提供有益的结构技术解决方案思路及参考案例。

Shanghai Xujiahui Centre is a typical transit-oriented-development(TOD)project,whose north podium is located above the subway tunnel or within the 50-meter subway protective area.Its foundation bearing capacity limitation is the main structural technical bottleneck.Taking this project as a case study,several structural technical solutions to overcome the bottleneck of foundation bearing restriction were elaborated,including the selection of lightweight and high-strength structural system,the special design for structural force transmission path to avoid foundation restriction zone,the adjustment of calculation concept of pile-raft foundation,the reduction of invalid additional loads,and the realizability of the objectives of performance-based seismic design and the reliability of the structure system were evidenced by the elastic time history analysis,elastic-plastic static analysis under rare earthquakes as well as the component checking for the roof truss system.Several useful ideas on structural technical solutions with reference case were summarized for the comprehensive development of transit-oriented-development projects.