基于振型分解反应谱法的大跨空间结构抗震设计研究

Study on Anti-seismic Design for Long-span Spatial Structures Based on Mode Superposition Response Spectrum Method

定义了广义振型参与质量来表征大跨空间结构各阶振型振动的主导方向,并通过控制广义振型参与质量之和占结构总质量的百分比来确定大跨空间结构振型分解反应谱法中参与组合的合理振型数.结合北京2008奥运会老山自行车馆屋盖网壳结构的抗震设计,验证了采用该方法确定的振型数目参与组合能够确保地震反应的精度.

The expression of generalized modal participation mass is derived for spatial structures and the mass participation factor is defined as the percentage of modal participation mass to the total mass of the structure system. The anti-seismic design of Laoshan Cycling Gymnasium for Beijing 2008 Olympic Games is taken as a case study to prove that the number of vibration modes needed to ensure the accuracy of mode superposition response spectrum analysis for long-span spatial structures can be determined based on this mass participation factor.