贵阳奥体中心主体育场罩篷钢结构抗震性能化设计研究
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(中国航空规划建设发展有限公司，北京 100120)［摘要］贵阳奥体中心主体育场罩篷采用了预应力平面桁架斜交网格结构体系，最大悬挑49m。首先确定了抗震性能化设计目标，然后分别采用振型分解反应谱法、弹性动力时程分析方法和弹塑性动力时程分析方法对该工程进行抗震性能研究。针对单独钢筋混凝土看台模型、钢结构模型以及结构整体模型三种计算模型，对结构自振特性、构件应力比、结构位移、塑性铰分布与损坏程度等性能进行深入量化分析与设计。另外针对上下部整体计算模型分别按一致激励和多点激励进行动力时程反应计算。计算表明：采用单独罩篷钢结构模型进行抗震设计存在不安全因素，必须考虑上下部共同工作的整体模型；多点激励法计算基底总剪力小于一致激励法计算结果，采用一致激励法进行设计能保证结构安全性；在罕遇地震作用下，看台钢筋混凝土结构刚度的退化对上部钢结构抗震有利。通过上述系列分析研究，实现了抗震安全性能化设计目标。［关键词］抗震性能化设计；一致激励法；多点激励法；弹塑性时程分析Seismic performance design and research on the steel roof of the main stadium in Guiyang Olympic Sports CenterGe Jiaqi, Huang Jiyang, Wang Shu, Liu Xingang, Zhang Guojun, Song Haiyan(China Aviation Planning and Construction Development Co., Ltd., Beijing 100120, China)Abstract:The structural system of prestressed oblique in-plane truss lattice with maximum 49m cantilever was employed for the main stadium roof in Guiyang Olympic Sports Center. The seismic performance design objective was determined, and then the seismic performance studies were conducted by response spectrum analysis, elastic dynamic time-history analysis and elasto-plastic dynamic time-history analysis respectively. The numerical analysis and design were performed to obtain the structural natural frequency of vibration, member stress ratio, displacement, plastic hinge distribution, and damage level based on different three models, which are only reinforced concrete stand, only steel roof and combined stand and roof. The single points motivation and multiple points motivation were utilized to perform dynamic time-history analysis for the combined model respectively. As shown from analyses, the co-ordinate work of the combined model shall be considered for the safety of the structure. The results show the structural safety can be ensured by using single points motivation method. Besides, under ultimate seismic load, the structural steel roof benefits from the stiffness degradation from reinforced concrete stand. Through above series of research, the seismic performance design objective was realized.Keywords:seismic performance design; single points motivation; multiple points motivation; elasto-plastic dynamic time-history analysis贵州省科技厅工业攻关项目(［2010］3002),贵阳市科技局工业攻关项目［2010］。作者简介：葛家琪,研究员,一级注册结构工程师，总结构师，Email:capdi.gssd@vip.163.com。参考文献［1］葛家琪，张国军，王树，等. 贵阳体育场体外预应力大悬挑钢管桁架结构设计研究［J］.建筑结构, 2009,39(10): 47-53.［2］谢礼立，翟长海. 最不利设计地震动研究［J］. 地震学报，2003，25(3)：250-261.［3］GB50011—2001建筑抗震设计规范［S］.2008版.北京：中国建筑工业出版社，2008.［4］王树，葛家琪，张庆亮，等. 大剧院上下结构共同工作对钢屋盖抗震性能影响分析［J］. 建筑结构，2008，38(12)：7-10.
