层间隔震结构的随机地震反应与失效概率分析
|
摘要
建立了层间隔震结构的动力分析模型,采用低频模拟和高频模拟方法相结合的综合功率谱模型模拟地震地面运动功率谱,运用虚拟激励法进行层间隔震结构的随机地震反应进行了分析,得到了隔震层及其他各层层间响应峰值的统计量。以隔震层和其他各层最大层间位移作为控制指标,建立极限状态方程,采用一次二阶矩方法,用MATLAB编程计算其失效概率,并用串联模式计算体系的整体失效概率。以江苏省高烈度区宿迁市的某20层的框剪结构为例,利用上述方法计算了层间隔震结构的位移随机响应和整体失效概率,并与非隔震结构进行了比较。结果表明,层间隔震结构上部各层失效概率较非隔震结构大大减小,且各层失效概率分布比较稳定。隔震结构整体的失效概率要远小于非隔震结构,层间隔震结构的动力可靠度显著增加。
The dynamic analytic model of story isolation structure is established.The seismic ground motion is assumed to be a hybrid model combining low frequency simulation and high frequency simulation,in order to reflect the frequency spectrum characteristics of seismic ground motion.Pseudo excitation method is used to calculate the stochastic seismic response of story isolation structure.The statistical quantity of the maximum story displacement of each layer is also obtained.The maximum story displacements of isolation layer and other layers are adopted as the performance index to establish the performance equation.The failure probability is calculated using first-order reliability method by MATLAB. The total reliability of structure is derived by regarding the stories to be of series relation.A 20-story frame shear-wall structure in high intensity zone in Suqian city is taken as an example.Stochastic seismic displacement responses and failure probabilities of isolated and non-isolated structure are compared.The results show that the superstructure's failure probability of the isolated structure is much smaller,and each layer's failure probability is well distributed.The failure probability of story isolation structure is much smaller than nonisolated structure.So the dynamic reliability of story isolation structure is increased rapidly.
The dynamic analytic model of story isolation structure is established.The seismic ground motion is assumed to be a hybrid model combining low frequency simulation and high frequency simulation,in order to reflect the frequency spectrum characteristics of seismic ground motion.Pseudo excitation method is used to calculate the stochastic seismic response of story isolation structure.The statistical quantity of the maximum story displacement of each layer is also obtained.The maximum story displacements of isolation layer and other layers are adopted as the performance index to establish the performance equation.The failure probability is calculated using first-order reliability method by MATLAB. The total reliability of structure is derived by regarding the stories to be of series relation.A 20-story frame shear-wall structure in high intensity zone in Suqian city is taken as an example.Stochastic seismic displacement responses and failure probabilities of isolated and non-isolated structure are compared.The results show that the superstructure's failure probability of the isolated structure is much smaller,and each layer's failure probability is well distributed.The failure probability of story isolation structure is much smaller than nonisolated structure.So the dynamic reliability of story isolation structure is increased rapidly.
引文
[1]祁皑,林腾云,郑国琛.层间隔震结构工作机理研究[J].地震工程与工程振动,2006,26(4):239-243.
[2]杜永峰,张恩海,李慧,等.隔震结构“小震不坏”的动力可靠度分析[J].地震工程与工程振动,2006,24(5):84-91.
[3]张颖,周福霖,谭平.层间隔震结构的非线性随机地震反应分析[J].工业建筑,2009,39(5):11-15.
[4]杜修力.水工建筑物抗震可靠度设计和分析用的随机地震输入模型[J].地震工程与工程振动,1998,18(4):76-81.
[5]林家浩,张亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004.
[6]贡金鑫,魏巍巍.工程结构可靠性设计原理[M].北京:机械工业出版社,2007.
[7]中华人民共和国行业标准.GB50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2008.
[2]杜永峰,张恩海,李慧,等.隔震结构“小震不坏”的动力可靠度分析[J].地震工程与工程振动,2006,24(5):84-91.
[3]张颖,周福霖,谭平.层间隔震结构的非线性随机地震反应分析[J].工业建筑,2009,39(5):11-15.
[4]杜修力.水工建筑物抗震可靠度设计和分析用的随机地震输入模型[J].地震工程与工程振动,1998,18(4):76-81.
[5]林家浩,张亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004.
[6]贡金鑫,魏巍巍.工程结构可靠性设计原理[M].北京:机械工业出版社,2007.
[7]中华人民共和国行业标准.GB50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2008.
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