超大跨度悬挑混凝土框桁架杂交结构静动力分析

ANALYSIS AND RESEARCH ON LARGE-SPAN CANTILEVERED CONCRETE TRUSS-FRAME STRUCTURE

遵义市规划展览馆中心悬挑部分22 m墙面采用超大跨度悬挑混凝土桁架结构,使得结构体系悬挑部分超大跨度悬挑混凝土桁架在静力及地震作用下的受力性能成为结构体系安全控制的关键因素。本文首先对主体结构进行静力分析,进行了基于变形性能及受力性能的优化选型,研究了桁架的腹杆布置形式对超大悬挑混凝土框桁架结构体系静力特性影响,随后又通过模态分析得出结构自振特性。分析表明,按选定性能目标优化得到的结构体系经济合理,实现了超大跨度悬挑混凝土框桁架杂交结构在静力及动力作用下性能安全的设计目标。

The cantilevered wall of stadium with 22 m long at the planning exhibition center of Zunyi employs a structural concrete system of the Large-Span cantilevered truss. The performanece in the condition of static and seismic loading becomes the Key-factors of the security of the stucture. First,the performance of the main stucture in the condition of stactic loading was analyzed adopting the performance target put forward in the performance. The choice of Large-Span cantilevered truss structure with the huge grid as the best scheme among many schemes. Then the Vibration characteristics studies were conducted by modal analysis. Analysis shows that the structural scheme selected based on the performance target put forward in the paper is reasonable,and the static and seismic peformance objectives for design is realized.