大跨度复杂空间悬挂结构自振特征与动力性能分析

Research on Vibration Characteristic and Seismic Performance of Long-span Space Suspended Structure

悬挂结构作为一种新型结构体系,因为其合理的传力路径,较高的材料利用率以及良好的减震效果,受到越来越多工程设计人员的青睐。天津大剧院采用国内少有的大跨度空间悬挂结构体系,通过约160根高强钢棒将两层楼板悬挂于屋盖下弦。利用SAP2000建立了天津大剧院有限元模型,并对整体模型和屋盖等效模型进行了自振特征和动力特性对比分析。结果表明该空间结构振型形态复杂、振型频率密集,在低阶振型主要表现为局部振动,在较高阶出现各部分区域的共同振动;悬挂楼层能起到良好的减震效果。

As a new damping structure,suspended structure system attracts a lot of attention of engineers because of its reasonable force transmission path,high material utilization and good damping effect.A long-span space suspended structure system which is rarely seen domestically is adopted by the Tianjin Theatre,in which tow floors are suspended on lower chords of the roof by about 160 high strength steel.This article established a finite element model of Tianjin Theatre using SAP2000,and analyzed the vibration characteristic and dynamic performance of both the whole model and the equivalent model.The results indicate that the mode shape of the space structure is complex and the mode frequency is dense,and local vibration always shows in low order while common vibration occurs in higher order.The suspended floors perform well on damping effect.