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。
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 point＇s 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 point＇s 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.
出处
《建筑结构》
CSCD
北大核心
2010年第12期1-9,共9页
Building Structure
基金
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]
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
single point＇s motivation
multiple points＇ motivation
elasto-plastic dynamic timehistory analysis
