多点输入反应谱法的理论研究
|
摘要
根据大跨度空间网格结构的特点,忽略拟静力反应项与动力反应项的耦合项,提出了多点输入反应谱计算的简化方法。该方法所表示的结构地震动反应主要由拟静力响应和动力响应两部分组成,其中拟静力响应是由地面各点输入位移不一致引起的;动力响应部分主要是由结构在地面加速度作用下引起的,它在形式上与传统反应谱法保持一致,但考虑了多点输入的影响。从将地震动功率谱密度函数简化为白噪声和频响函数对地震动频率的选择性两方面入手,对拟静力反应和动力反应部分的组合系数进行了研究并简化。结果表明,简化方法是可行的,它一方面减少了计算工作量,另一方面又保证了计算精度。采用多点输入时程分析法和多点输入反应谱法,计算了哈工大体育场罩篷的地震反应,计算结果证实了多点输入反应谱理论的正确性。
According to the characteristics of a space truss,ignor i ng the coupling of pseudo-static and dynamic responses,a simplified multi-supp ort response spectrum method is presented.In this method,the response of a struc ture consists of two parts:pseudo static response caused by inconsistent ground displacement,and structural dynamic response caused by ground motion accelerati on.The dynamic response term is formally consistent with the classical response spectrum method,except that the influence of multiple input multi-support is al so considered. Calculation of some parameters in the multi-support response spe ctrum is simpli fied in virtue of seismic motion power spectrum density function and frequency r esponse function.Results imply that the simplified method is efficient.It n ot only reduces the amount of calculation, but also maintains the accuracy.The s eismic responses of a stadium shed are analyzed by the multi-support time histo ry method and the multi-support response spectrum method. The results of the ca lculation indicate that the multi-support response spectrum method is correct.
According to the characteristics of a space truss,ignor i ng the coupling of pseudo-static and dynamic responses,a simplified multi-supp ort response spectrum method is presented.In this method,the response of a struc ture consists of two parts:pseudo static response caused by inconsistent ground displacement,and structural dynamic response caused by ground motion accelerati on.The dynamic response term is formally consistent with the classical response spectrum method,except that the influence of multiple input multi-support is al so considered. Calculation of some parameters in the multi-support response spe ctrum is simpli fied in virtue of seismic motion power spectrum density function and frequency r esponse function.Results imply that the simplified method is efficient.It n ot only reduces the amount of calculation, but also maintains the accuracy.The s eismic responses of a stadium shed are analyzed by the multi-support time histo ry method and the multi-support response spectrum method. The results of the ca lculation indicate that the multi-support response spectrum method is correct.
引文
[1] 林家浩,钟万勰,张亚辉.大跨度结构抗震计算的随机振动方法[J].建筑结构学报,2000,21(1):29～35
[2] KiureghianAD ,NeuenhoferA .Responsespectrummethodformulti supportseismicexcitations[J].EarthquakeEngineering&StructuralDynamics,1992,21(8):713～740
[3] BerrahM ,KauselE .Responsespectrumanalysisofstructuressubjectedtospatiallyvaryingmotions[J].EarthquakeEngi neering&StructuralDynamics,1992,21:461～470
[4] 李宏男.结构多维抗震理论与设计方法[M].北京:科学出版社,1998
[5] BerrahM ,KauselE .Amodelcombinationruleforspatiallyvaryingseismicmotions[J].EarthquakeEngineering&Struc turalDynamics,1993,22:791～800
[6] 刘先明.大跨度空间网格结构多点输入反应谱理论的研究与应用[D].南京:东南大学,2003
[7] 朱莅秋.随机振动[M].北京:科学出版社,1998
[2] KiureghianAD ,NeuenhoferA .Responsespectrummethodformulti supportseismicexcitations[J].EarthquakeEngineering&StructuralDynamics,1992,21(8):713～740
[3] BerrahM ,KauselE .Responsespectrumanalysisofstructuressubjectedtospatiallyvaryingmotions[J].EarthquakeEngi neering&StructuralDynamics,1992,21:461～470
[4] 李宏男.结构多维抗震理论与设计方法[M].北京:科学出版社,1998
[5] BerrahM ,KauselE .Amodelcombinationruleforspatiallyvaryingseismicmotions[J].EarthquakeEngineering&Struc turalDynamics,1993,22:791～800
[6] 刘先明.大跨度空间网格结构多点输入反应谱理论的研究与应用[D].南京:东南大学,2003
[7] 朱莅秋.随机振动[M].北京:科学出版社,1998
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心