高层组合隔震结构随机地震响应及优化分析
|
摘要
利用虚拟激励法分析了高层组合隔震体系在平稳随机地震激励下的随机响应。隔震层由叠层橡胶支座、摩擦滑移支座及粘滞阻尼器组成。采用等效线性化处理,建立非线性阻尼多自由度线性模型,采用了能较好模拟长周期地面运动的加速度功率谱密度函数。分别建立隔震层位移和上部结构层间位移的极限状态方程,采用一次二阶矩方法计算结构各层间位移的失效概率,并根据串联系统的可靠度界限理论计算隔震结构的体系可靠度。以江苏省高烈度区宿迁市某25层的高层组合隔震结构为例,通过随机地震响应分析,得到结构隔震层和上部结构位移峰值响应的统计量以及各楼层的失效概率和结构体系可靠度,结果表明高层结构采用组合隔震技术后,体系的动力可靠度较不隔震时有明显提高。
We research the random response of parallel isolated high-rise structure under stable random excitation by pseudo excitation approach.The isolation layer is composition of laminated rubber bearings,sliding bearings and viscous dampers.The structure is modeled as non-linear damped system based on equivalent linear parameters,and adopts acceleration power spectral density function which can model long period ground motion well.The displacement of isolation layer and inter-story displacement of superstructure are used as the ultimate value to establish the performance equation.The failure probability is calculated using first-order reliability method(FORM),and the total reliability of structure is derived by regarding the stories to be of series relation.With a 25-story isolated structure in high earthquake-intensity area in Jiangsu used as a numerical example,we can obtain the statistic of the main response of isolation layer and superstructure,failure probability of every layer and reliability of structure system by seismic response analysis.The results contrive that the dynamic reliability of structure will be increased after using parallel isolated supports in high-rise building.
We research the random response of parallel isolated high-rise structure under stable random excitation by pseudo excitation approach.The isolation layer is composition of laminated rubber bearings,sliding bearings and viscous dampers.The structure is modeled as non-linear damped system based on equivalent linear parameters,and adopts acceleration power spectral density function which can model long period ground motion well.The displacement of isolation layer and inter-story displacement of superstructure are used as the ultimate value to establish the performance equation.The failure probability is calculated using first-order reliability method(FORM),and the total reliability of structure is derived by regarding the stories to be of series relation.With a 25-story isolated structure in high earthquake-intensity area in Jiangsu used as a numerical example,we can obtain the statistic of the main response of isolation layer and superstructure,failure probability of every layer and reliability of structure system by seismic response analysis.The results contrive that the dynamic reliability of structure will be increased after using parallel isolated supports in high-rise building.
引文
[1]党育,杜永峰,李慧.基础隔震结构设计及施工指南[M].北京:中国水利水电出版社,2007.
[2]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.
[3]赵国藩,金伟良,贡金鑫.结构可靠度理论[M].北京:中国建筑工业出版社,2000.
[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]洪峰,江近仁,李玉亭.地震地面运动的功率谱模型及其参数的确定[J].地震工程与工程振动,1994,14(2):46-51.
[6]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,2001.
[7]杜永峰.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,2004,24(5):84-91.
[2]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.
[3]赵国藩,金伟良,贡金鑫.结构可靠度理论[M].北京:中国建筑工业出版社,2000.
[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]洪峰,江近仁,李玉亭.地震地面运动的功率谱模型及其参数的确定[J].地震工程与工程振动,1994,14(2):46-51.
[6]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,2001.
[7]杜永峰.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,2004,24(5):84-91.
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