极低温度下LRB力学性能及对高层结构地震响应的影响
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摘要
研究极低气温(-40℃)下温度变化对隔震结构中铅芯橡胶支座力学性能的影响及其力学性能变化特征,及﹣40℃至40℃区间支座的温度相关性。选用直径为600 mm的原型铅芯橡胶支座,采用电液伺服加载系统完成剪切应变为100%情况不同恒定温度下的低周反复加载试验。发现支座在极低温度下的力学性能与常温下的力学性能差异显著。提出铅芯橡胶支座屈服后刚度与屈服荷载的温度修正方程,及隔震结构设计中铅芯橡胶支座基于温度的力学参数取值建议。给出考虑温度影响的隔震结构地震反应影响算例,分析结果表明温度对强震下隔震结构的隔震层位移、上部结构层间剪力以及上部结构顶层的加速度响应影响显著。
The variation of mechanical properties of lead rubber bearing(LRB) used as an isolation structure at low temperature of-40℃ was studied the correlation between properties of LRB and the temperature ranged from-40℃ to 40℃ was investigated.Three LRB specimens with diameter of 600mm were tested,and the low-cycle reversed loading experiments under 100% shear deformation at different temperatures were accomplished on an electro-hydraulic servo loading system.The study shows that there exist significant differences in mechanical properties of LRB at extremely low temperature compared with those at room temperature.Based on the test results,considering the temperature effect,the corrections on the equatios for the stiffness of LRB after yielding and for the yield load were proposed and the ranges of parameters suitable for isolation structure design were provided.The results of practical examples show the significant temperature effects on the displacement of isolated system,the shear force between stories and the acceleration response at the top of upper structure under strong earthquake.
The variation of mechanical properties of lead rubber bearing(LRB) used as an isolation structure at low temperature of-40℃ was studied the correlation between properties of LRB and the temperature ranged from-40℃ to 40℃ was investigated.Three LRB specimens with diameter of 600mm were tested,and the low-cycle reversed loading experiments under 100% shear deformation at different temperatures were accomplished on an electro-hydraulic servo loading system.The study shows that there exist significant differences in mechanical properties of LRB at extremely low temperature compared with those at room temperature.Based on the test results,considering the temperature effect,the corrections on the equatios for the stiffness of LRB after yielding and for the yield load were proposed and the ranges of parameters suitable for isolation structure design were provided.The results of practical examples show the significant temperature effects on the displacement of isolated system,the shear force between stories and the acceleration response at the top of upper structure under strong earthquake.
引文
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[8]李慧,杜永峰,狄生奎,等.叠层橡胶隔震支座的低温往复试验及等效阻尼比推算[J].兰州理工大学学报,2006,32(5):117-119.
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[12]中华人民共和国.建筑隔震橡胶支座GB20688.3-2006[S].北京:中国标准出版社,2006.
[2]Derham C J,Thomas A G.The design of seismic isolation bearing[C].Century2-Emerging Technology Conference,2000.
[3]庄学真,周福霖,冯德明,等.1200型大直径建筑叠层铅芯橡胶支座性能研究[J].西安建筑科技大学学报,2008,4(3):368-375.
[4]庄学真,周福霖,徐丽,等.大直径建筑叠层橡胶隔震装置温度相关性及老化性能研究[J].西安建筑科技大学学报,2009,41(6):791-798.
[5]刘文光,庄学真,周福霖,等.中国铅芯夹层橡胶隔震支座各种相关性能及长期性能研究[J].地震工程与工程振动,2002,22(1):114-120.
[6]刘文光,杨巧荣,周福霖.天然橡胶隔震支座温度相关性能试验研究[J].广州大学学报,2002,1(6):51-56.
[7]刘文光,李峥嵘,周福霖,等.低硬度橡胶隔震支座各种相关性及老化徐变特性[J].地震工程与工程振动,2002,22(6):115-121.
[8]李慧,杜永峰,狄生奎,等.叠层橡胶隔震支座的低温往复试验及等效阻尼比推算[J].兰州理工大学学报,2006,32(5):117-119.
[9]尹维祥.叠层橡胶支座稳定性及其受低温环境的影响[D].兰州:甘肃工业大学,1999.
[10]Itoh Y,Gu H S.Prediction of aging characteristics in natural rubber bearings used in bridges[J].Journal of Bridge Engineering ASCE,2009,14(2):122-128.
[11]Du Y F,Li H,Ma Y G,et al.Behaviour of laminated rubber bearing under low and its effect on the dynamic reliability of isolated structure[A].//4th International Conference on Earthquake Engineering,Taipei:2006.
[12]中华人民共和国.建筑隔震橡胶支座GB20688.3-2006[S].北京:中国标准出版社,2006.
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