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苏州中心是目前苏州地区在建的最大商业综合体项目,其超长异形网格屋面投影面积约为35 000m2,覆盖在下部4个独立的建筑单体之上,展开长度约为630m。整个屋面结构不设置伸缩缝或抗震缝,属于超长大跨单层网格结构。不同于传统曲面的三角形网格形式,该项目采用四边形网格,在找形设计时进行了相应曲率控制。设计中采用了多种软件进行了承载力极限状态验算、正常使用极限状态验算、抗震性能设计、稳定分析及抗连续倒塌分析等。设计中还采用数值模拟与风洞试验对比以考虑风作用影响,分析了结构体型系数及风振响应。抗震设计中针对上、下结构阻尼比不同的特点,进行了多点激励与一致激励的对比,分析了结构的地震响应,并依据分析结果指导结构设计。采用的设计方法可供类似异形网格结构设计借鉴。
Suzhou Center is currently the largest commercial complex under construction in Suzhou. The projected area of the over-long irregular shaped grid roof is about 35,000m2, covering 4 separate buildings at the lower part, with an expansion of about 630m. The roof structure is not provided with expansion joints or seismic joints, belonging to the ultra-long span single-layer grid structure. Different from the traditional triangular mesh form, the project uses a quadrilateral mesh, and the corresponding curvature control is performed during the form-finding design. The design uses a variety of software carried out the ultimate bearing capacity checking, the normal use of limit checking, seismic performance design, stability analysis and anti-continuous collapse analysis. In the design, numerical simulation is compared with wind tunnel test to consider the effect of wind effect, and the structural body coefficient and wind-induced vibration response are analyzed. In seismic design, according to different characteristics of upper and lower structure damping ratio, the multi-point excitation and consistent excitation are compared, the seismic response of the structure is analyzed, and the structural design is guided according to the analysis results. The design method used for similar shaped grid structure design for reference.