低硬度G3橡胶隔震支座试验研究及其隔震效果分析
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摘要
本文对低硬度G3橡胶隔震支座(简称为G3橡胶隔震支座,G3橡胶的剪切模量G近似为0.3MPa)进行水平压剪及竖向压缩试验,研究其水平和竖向力学性能;在此基础上,对铅-G3橡胶支座隔震结构进行动力弹塑性时程分析,探索G3橡胶隔震支座对隔震结构抗震性能的影响。研究表明,G3橡胶隔震支座具有较小的水平及竖向刚度;随着面压的增加,G3橡胶隔震支座的等效水平刚度和竖向刚度逐渐增大。橡胶支座规范(GB 20688-3 2006)的水平刚度和竖向刚度理论值与G3橡胶隔震支座的水平刚度和竖向刚度实测值误差在10%以内。不同地震动作用下,铅-G3橡胶隔震支座对结构基底剪力及层间位移角的隔震效果均优于铅-G4橡胶隔震支座和铅-G6橡胶隔震支座,但其隔震效果提升较少,原因为上述3类橡胶隔震支座的刚度相比于上部结构的刚度都是较小的数值,橡胶隔震支座刚度的些许增减对结构地震响应的影响较小。
Horizontal mechanical properties and vertical mechanical properties of the low-hardness G3 rubber bearings(G3 rubberbearings, shearing modulus of G3 rubber is approximately 0.3 MPa) are tested by horizontal pressure-shear testsand vertical compression tests, respectively. Then dynamic elastic-plastic time history analysis of G3-rubber-bearing isolation structure is conducted to explore the effect of G3 rubber bearings on structural seismic isolation performance. The results indicate that, G3 rubber bearings have low horizontal stiffness and vertical stiffness, the G3 rubber bearing's horizontal stiffness and vertical stiffness increase with the increasing of the vertical loads. Errors between the test results and theoretical results(specification for rubber bearings GB 20688-3 2006)of G3 rubber bearing's horizontal stiffness and vertical stiffness are within 10%. Under different earthquakes,the isolation effects on inter-storey drifts and base shears of the lead-G3-rubber-bearings are better than those of lead-G4 rubber bearings/lead-G6 rubber bearings, however, the improvement of isolation effect of lead-G3 rubber bearing is not significant, the reason is that the stiffnesses of rubber bearings are much less than those of upper structure, the variation of stiffnesses of rubber bearings has slight influence on the earthquake responses of the isolated structures.
Horizontal mechanical properties and vertical mechanical properties of the low-hardness G3 rubber bearings(G3 rubberbearings, shearing modulus of G3 rubber is approximately 0.3 MPa) are tested by horizontal pressure-shear testsand vertical compression tests, respectively. Then dynamic elastic-plastic time history analysis of G3-rubber-bearing isolation structure is conducted to explore the effect of G3 rubber bearings on structural seismic isolation performance. The results indicate that, G3 rubber bearings have low horizontal stiffness and vertical stiffness, the G3 rubber bearing's horizontal stiffness and vertical stiffness increase with the increasing of the vertical loads. Errors between the test results and theoretical results(specification for rubber bearings GB 20688-3 2006)of G3 rubber bearing's horizontal stiffness and vertical stiffness are within 10%. Under different earthquakes,the isolation effects on inter-storey drifts and base shears of the lead-G3-rubber-bearings are better than those of lead-G4 rubber bearings/lead-G6 rubber bearings, however, the improvement of isolation effect of lead-G3 rubber bearing is not significant, the reason is that the stiffnesses of rubber bearings are much less than those of upper structure, the variation of stiffnesses of rubber bearings has slight influence on the earthquake responses of the isolated structures.
引文
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[2] Gordon P W, Andrew S, Whittaker. Vertical earthquake loads on seismic isolation systems in bridges[J]. Journal of Structural Engineering, 2008, 134(11): 1696-1704
[3] He Wen-fu, Liu Wen-guang, Yang Qiao-rong, et al. Nonlinear rotation and shear stiffness theory and experiment research on rubber isolators[J]. Journal of Engineering Mechanics, 2012, Vol. 138(5): 441-449
[4] Milani G, Milani F. Stretch-stress behavior of elastomeric seismic isolators with different rubber materials: numerical insight[J]. Journal of Engineering Mechanics, 2012, Vol. 138(5): 416-429
[5] 邹立华,饶宇,黄凯,等. 预应力厚层橡胶支座隔震性能研究[J]. 建筑结构学报,2013,34(2):76-82Zou Li-hua, Rao Yu, Huang Kai,et al. Research on isolating property of prestressed thick rubber bearings[J]. Journal of Building Structures, 2013,34(02):76-82(in Chinese)
[6] 刘文光, 李峥嵘, 周福霖,等. 低硬度橡胶隔震支座基本力学性能及恢复力特性[J]. 地震工程与工程振动, 2002(03): 138-144Liu Wen-guang, Li Zheng-rong, Zhou Fu-lin, et al. Force-displacement relation and fundamental properties of low stiffness rubber bearings[J]. Earthquake Engineering and Engineering Vibration, 2002(3): 138-144(in Chinese)
[7] 沈朝勇, 周福霖, 崔杰,等. 高阻尼隔震橡胶支座的相关性试验研究及其参数取值分析[J]. 地震工程与工程振动, 2012, 32(6):95-103Shen Chao-yong, Zhou Fu-lin, Cui Jie, et al. Dependency test research of mechanical performance of HDR and its parametric value analysis[J]. Earthquake Engineering and Engineering Vibration, 2012, 32(6):95-103(in Chinese)
[8] 何文福, 刘文光, 杨彦飞,等. 厚层橡胶隔震支座基本力学性能试验[J]. 解放军理工大学学报(自然科学版), 2011, 12(3):258-263He Wen-fu, Liu Wen-guang, Yang Yan-fei, et al. Basic mechanical properties of thick rubber isolators[J]. Journal of PLA University of Science and Technology (Natural Science Edition),2011, 12(3): 258-263(in Chinese)
[9] 薛素铎, 李雄彦, 潘克君. 大跨空间结构隔震支座的应用研究[J]. 建筑结构学报,2010,31(S2):56-61Xue Su-duo, Li Xiong-yan, Pan Ke-jun. Seismic isolation technology application in spatial structures[J]. Journal of Building Structures, 2010, 31(S2): 56-61(in Chinese)
[10] GB/T 20688.1-2007,橡胶支座:第1 部分:隔震橡胶支座试验方法[S]GB/T 20688.1-2007, Rubber bearings part 1: Seismic-protection isolators test methods[S](in Chinese)
[11] GB 20688-3 2006, 橡胶支座第3 部分: 建筑隔震橡胶支座[S]GB 20688-3 2006, Rubber bearingspart 3: Elastometric seismic protection isolators for buildings[S](in Chinese)
[2] Gordon P W, Andrew S, Whittaker. Vertical earthquake loads on seismic isolation systems in bridges[J]. Journal of Structural Engineering, 2008, 134(11): 1696-1704
[3] He Wen-fu, Liu Wen-guang, Yang Qiao-rong, et al. Nonlinear rotation and shear stiffness theory and experiment research on rubber isolators[J]. Journal of Engineering Mechanics, 2012, Vol. 138(5): 441-449
[4] Milani G, Milani F. Stretch-stress behavior of elastomeric seismic isolators with different rubber materials: numerical insight[J]. Journal of Engineering Mechanics, 2012, Vol. 138(5): 416-429
[5] 邹立华,饶宇,黄凯,等. 预应力厚层橡胶支座隔震性能研究[J]. 建筑结构学报,2013,34(2):76-82Zou Li-hua, Rao Yu, Huang Kai,et al. Research on isolating property of prestressed thick rubber bearings[J]. Journal of Building Structures, 2013,34(02):76-82(in Chinese)
[6] 刘文光, 李峥嵘, 周福霖,等. 低硬度橡胶隔震支座基本力学性能及恢复力特性[J]. 地震工程与工程振动, 2002(03): 138-144Liu Wen-guang, Li Zheng-rong, Zhou Fu-lin, et al. Force-displacement relation and fundamental properties of low stiffness rubber bearings[J]. Earthquake Engineering and Engineering Vibration, 2002(3): 138-144(in Chinese)
[7] 沈朝勇, 周福霖, 崔杰,等. 高阻尼隔震橡胶支座的相关性试验研究及其参数取值分析[J]. 地震工程与工程振动, 2012, 32(6):95-103Shen Chao-yong, Zhou Fu-lin, Cui Jie, et al. Dependency test research of mechanical performance of HDR and its parametric value analysis[J]. Earthquake Engineering and Engineering Vibration, 2012, 32(6):95-103(in Chinese)
[8] 何文福, 刘文光, 杨彦飞,等. 厚层橡胶隔震支座基本力学性能试验[J]. 解放军理工大学学报(自然科学版), 2011, 12(3):258-263He Wen-fu, Liu Wen-guang, Yang Yan-fei, et al. Basic mechanical properties of thick rubber isolators[J]. Journal of PLA University of Science and Technology (Natural Science Edition),2011, 12(3): 258-263(in Chinese)
[9] 薛素铎, 李雄彦, 潘克君. 大跨空间结构隔震支座的应用研究[J]. 建筑结构学报,2010,31(S2):56-61Xue Su-duo, Li Xiong-yan, Pan Ke-jun. Seismic isolation technology application in spatial structures[J]. Journal of Building Structures, 2010, 31(S2): 56-61(in Chinese)
[10] GB/T 20688.1-2007,橡胶支座:第1 部分:隔震橡胶支座试验方法[S]GB/T 20688.1-2007, Rubber bearings part 1: Seismic-protection isolators test methods[S](in Chinese)
[11] GB 20688-3 2006, 橡胶支座第3 部分: 建筑隔震橡胶支座[S]GB 20688-3 2006, Rubber bearingspart 3: Elastometric seismic protection isolators for buildings[S](in Chinese)