双向张弦梁结构的多维地震响应分析和计算  

Dynamic responses of two-way beam string structures under multi-dimensional earthquake excitations

作　　者：邓华[1] 谢道清[1] 林华峰[1] 

机构地区：[1]浙江大学空间结构研究中心,杭州310058

出　　处：《振动与冲击》2010年第10期16-22,101,共8页Journal of Vibration and Shock

基　　金：国家科技支撑计划项目(2006BAJ03A03-03);国家自然科学基金项目(50638050)资助

摘　　要：采用随机振动理论的功率谱法,对双向张弦梁结构在多维地震作用下的动力性能及抗震计算两方面问题进行了探讨。以一个90m×90m的双向张弦梁屋盖结构为算例,分析了结构的自振特性、多维地震下的位移和内力响应特点、各地震动分量对结构响应的贡献以及上下部协同工作的影响等。在地震作用计算方面,对组合振型数的选取、预应力效应的影响、阻尼比的敏感性以及《建筑抗震设计规范》(GB50011)的多维地震效应组合方法的有效性进行了考察。对双向张弦梁结构的一些非常规地震响应特点给予了强调,提出抗震计算方面的建议,可供设计人员参考。Based on the power spectrum method of stochastic vibration theory,the seismic response and its computation of two-way beam string structures(BSS)under multi-dimensional earthquake excitation were discussed.By means of an illustrative 90m × 90m two-way BSS roof,dynamic properties and characteristics of multi-dimensional earthquake responses were presented.Structural response contributions from different ground motion components and interactions between the roof and the supporting frame were also analyzed.Some aspects on seismic action computation of two-way BSS were further investigated,including the number of the participating modes,the impact of initial prestress distributions and the sensitivity of damping ratios.The validity of the multi-dimensional seismic effect combination method suggested in China Code for Seismic Design of Buildings(GB50011),was also investigated.Unconventional dynamic response characteristics of two-way BSS were emphasized.Some suggestions about the aseismic computation were also put forward for design of two-way BSS.

关 键 词：双向张弦梁 多维地震 动力响应 抗震计算 随机振动 

分 类 号：TU393.3[建筑科学—结构工程] TU973.31