开合屋盖结构动力特性研究  

Research on Dynamic Behavior of Retractable Roof Structures

作　　者：范重[1] 孟小虎 彭翼[1] 

机构地区：[1]中国建筑设计研究院,北京100044 [2]珠海华发房地产开发有限公司,广东珠海519020

出　　处：《建筑钢结构进展》2015年第4期27-36,共10页Progress in Steel Building Structures

摘　　要：开合屋盖结构属于复杂多重子结构体系,其动力特性非常复杂,活动屋盖在竖向地震作用下的响应远大于根据《建筑抗震设计规范》(GB 50011—2010)得到的结果。以国家网球馆(钻石球场)为例,对开合屋盖结构的振型模态与自振周期进行了深入分析,研究了质量参与系数的分布规律。高阶振型对开合屋盖结构动力响应的影响很大,尤其对于竖向地震作用,高振型起主要控制作用。在模态阻尼比的基础上,提出根据质量参与系数加权平均得到的一致阻尼比,物理意义明确,便于工程应用。计算分析表明,采用一致阻尼比算法得到结构各部位的内力及位移与按照模态阻尼比法的结果非常接近。Retractable roof structure system is a complex multi level substructure. The seismic response of movable roof under vertical earthquake action is much larger than that calculated according to the provisions in the Code for Seismic Design of Buildings （GB 50011--2010）. In this paper, the vibration modes of retractable roof structure, the natural vibration period and the distribution regularity of mass participation coefficient are studied, based on the National Tennis Court ＂Diamond Stadium＂ project. The analysis results indicate that high frequency modes have great influence on the dynamic response of retractable roof structures, especially for vertical earthquake, in which high frequency modes have dominant influence. Based on the modal damping ratio, a unified damping ratio is proposed in this paper, according to the mass participation factor. The new proposed damping ratio has clear physical meaning, and is convenient for engineering applications. The result shows that the internal forces and displacements of the structure are close between the output from the unified damping ratio and the modal damping ratio.

关 键 词：开合屋盖 动力特性 竖向地震作用 质量参与系数 一致阻尼比 

分 类 号：TU31[建筑科学—结构工程] TU352.1