地震作用下高层隔震结构高宽比限值计算
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摘要
针对高层隔震结构体系,采用多质点体系,基于隔震结构在地震中不出现倾覆的条件,结构边缘隔震支座拉应力不超过1 MPa,压应力不超过30 MPa,推导了高层隔震结构的高宽比限值,并考虑了不同的设防烈度、场地条件和结构阻尼比的影响。分析高宽比限值与结构基本周期的关系,得知了结构的基本周期变化对高宽比限值的影响。以三跨高层基础隔震结构为例,计算了隔震支座最大位移为300 mm和400 mm时隔震结构的高宽比限值,分析结果为设计高层隔震结构时对高宽比的取值提供参考。
Aimed to tall isolated structure, by adopting a multi-mass system and considering the condition that could keep tall isolated structure from overturning during earthquake, the tensile stress in isolation bearing under the edge of structure should not exceed 1 MPa, the compressive stress in isolation bearing under the edge of structure should not exceed 30 MPa, the paper derives the limit of height-width ratio formulas with consideration of the effects of different earthquake fortification intensities, site classifications, and damping ratios of isolated story. The paper analyzes the relationship between the limit of height-width ratio and the basic period of structure, and gets the effect of the change of structural basic period on the limit of height-width ratio.Taking the three-span tall base-isolated structure as an example, the paper calculates the high width ratio ofisolated structure with the maximum displacement of isolation bearing of 300 mm and 400 mm. The analysis results provide reference for the height-width ratio of Tall isolated structure.
Aimed to tall isolated structure, by adopting a multi-mass system and considering the condition that could keep tall isolated structure from overturning during earthquake, the tensile stress in isolation bearing under the edge of structure should not exceed 1 MPa, the compressive stress in isolation bearing under the edge of structure should not exceed 30 MPa, the paper derives the limit of height-width ratio formulas with consideration of the effects of different earthquake fortification intensities, site classifications, and damping ratios of isolated story. The paper analyzes the relationship between the limit of height-width ratio and the basic period of structure, and gets the effect of the change of structural basic period on the limit of height-width ratio.Taking the three-span tall base-isolated structure as an example, the paper calculates the high width ratio ofisolated structure with the maximum displacement of isolation bearing of 300 mm and 400 mm. The analysis results provide reference for the height-width ratio of Tall isolated structure.
引文
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[2]吴香香,孙丽,李宏男.竖向地震动对隔震结构高宽比限值的影响分析[J].沈阳建筑工程学院学报,2002,18(2):81-84.
[3]祁皑,范宏伟.基于结构设计的基础隔震结构高宽比限值的研究[J].土木工程学报,2007,40(4):13-20.
[4]祁皑,商昊江.高层基础隔震结构高宽比限值分析[J].振动与冲击,2011,30(11):272-280.
[5]祁皑,徐翔,范宏伟.高层隔震结构高宽比限值研究[J].建筑结构,2013,43(6):50-54.
[6]王栋,吕西林.不同高宽比基础隔震高层结构振动台试验研究及对比分析[J].振动与冲击,2015,17(3):109-118.
[7]Anil K.Chopra结构动力学[M].谢礼立,吕大刚,译.北京:高等教育出版社,2007.
[8]祁皑,林于东.改进的基础隔震结构地震作用简化计算方法[J].地震工程与工程振动,2006,26(1):152-157
[9]杨鹏程.高层框架-剪力墙隔震结构高宽比限值研究及应用[D].广州:广州大学,2016
[10]中华人民共和国住房和城乡建设部.建筑抗震设计规范GB50011-2010[S].北京:中国建筑工业出版社,2010.