某首层柱顶隔震结构动力特性测试研究
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摘要
为了达到隔震设计的目的并检验隔震层的工作性能,测试分析了采用首层柱顶隔震技术的某五层框架结构在环境激励和初位移条件下的动力特性,得到了结构的前3阶自振特性如自振频率、振型和阻尼比;分析了初位移条件下隔震层的自由衰减曲线和滞回性能。结果表明:环境激励条件下,隔震结构与非隔震结构动力特性相近,隔震结构在正常使用状态下具有足够的稳定性;初位移条件下,隔震结构的自振周期比非隔震结构长,结构的阻尼比较大,隔震层滞回曲线较饱满,隔震层具有快速复位的特性,能消除长期以来有关对隔震层是否具有自动复位特性的疑虑。
In order to achieve the purpose of isolation design and examine the performance of isolation layer,dynamic properties are tested and analyzed for a five-story frame-structure on which the first-floor isolation technology is applied under environmental vibration and different initial displacements of isolation layer.The structure's first three natural vibration characteristics including frequencies,mode shapes and damping ratios are obtained.Hysteresis curves and free damping curves under different initial displacements of isolation layer are drew and analyzed.Test and analysis results indicate that the isolated structure and the un-isolated structure have similar dynamic properties under environmental vibration,and the isolated structure with full hysteresis loops has adequate stability,longer period and higher damping ratios than un-isolated structure.Isolation layer has obvious property of resetting,which answers the long-term question whether the isolation layer has the property of resetting.
In order to achieve the purpose of isolation design and examine the performance of isolation layer,dynamic properties are tested and analyzed for a five-story frame-structure on which the first-floor isolation technology is applied under environmental vibration and different initial displacements of isolation layer.The structure's first three natural vibration characteristics including frequencies,mode shapes and damping ratios are obtained.Hysteresis curves and free damping curves under different initial displacements of isolation layer are drew and analyzed.Test and analysis results indicate that the isolated structure and the un-isolated structure have similar dynamic properties under environmental vibration,and the isolated structure with full hysteresis loops has adequate stability,longer period and higher damping ratios than un-isolated structure.Isolation layer has obvious property of resetting,which answers the long-term question whether the isolation layer has the property of resetting.
引文
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[2]祁皑.层间隔震技术评述[J].地震工程与工程振动,2004,24(6):114-120.
[3]杨树标,马裕超,李旭光,等.复合隔震结构模型振动台试验研究[J].地震工程与工程振动,2010,30(1):142-146.
[4]周云,张季超,唐玉果,等.广东科学中心E区隔震支座的优化布置分析[J].地震工程与工程振动,2009,29(4):183-191.
[5]金星,韦永祥,张红才,等.基于强震观测的隔震结构地震反应分析[J].地震工程与工程振动,2009,29(2):19-28.
[6]刘文光,周福霖,庄学真,等.柱端隔震夹层橡胶垫力学性能试验研究[J].地震工程与工程振动,1999,19(3):121-126.
[7]魏陆顺,周福霖,陈建秋,等.隔震结构特性测试研究[J].振动与冲击,2007,26(3):150-152.
[8]陆伟东,蓝宗建,刘伟庆,等.某高层建筑结构动力测试与抗震性能分析[J].世界地震工程,2010,26(1):169-174.
[9]姚振纲,刘祖华.建筑结构试验[M].上海:同济大学出版社,1996:160-177.
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