低硬度大直径橡胶隔震支座竖向荷载作用下钢板应力研究
摘要
采用大型通用有限元程序,对低硬度大直径橡胶隔震支座在竖向荷载作用下的基本性能进行了精细有限元分析。分析了在竖向荷载作用下支座上下封板、内部钢板的各种应力分布,以及支座顶部是否施加竖向同位移约束、支座孔径比、橡胶材料G值、内部单层橡胶厚度与内部单层钢板厚度之比对支座内钢板受力的影响。结果表明,内部钢板最大Mises应力、最大径向水平正应力约为支座竖向压力的4倍、2.5倍;支座顶部是否施加竖向同位移约束对支座用钢板内力影响较大,特别是支座上封板;橡胶G值的变化对内部钢板受力基本没影响;支座孔径比对靠近孔边缘部分内部钢板应力不均匀性分布影响较大;内部单层橡胶厚度与内部单层钢板厚度的比值对内部钢板的Mises应力、径向正应力、环向正应力影响较大,但对其竖向正应力基本没影响。
Linear natural rubber bearing(LNR) isolators with large diameter and low IRHD rubber are analysed with FEM program.The stresses of the upper cover steel plate,the bottom cover steel plate and the inner steel plate of the isolator are researched.Some factors are considered,such as the constraints at the top of isolator,shear modules of the inner rubber,the ratio between thickness of one inner rubber and thickness of one inner steel plate etc.The results show that the maximum value of Mises stresses of the inner steel plate and the maximum value of normal stresses in the radius direction of the inner steel plate,are about 4 and 2.5 times the vertical pressures respectively;the stresses of steel of isolator are affected by the constraints at the top of isolator,especially for the upper cover steel plate of isolator.There is no effect on the stresses of the inner steel plate of isolator while changing shear modules of the inner rubber of isolator. The change of ratio between the diameter of core and the diameter of isolator will affect the distribution of the stresses of inner steel plate near the core.The ratio between thickness of inner rubber and thickness of inner steel plate has considerable influence on Mises stresses and normal stresses(in radial and circumferential direction of isolator) of the inner steel plate,but slight influence on the vertical normal stresses of the inner steel plate.
Linear natural rubber bearing(LNR) isolators with large diameter and low IRHD rubber are analysed with FEM program.The stresses of the upper cover steel plate,the bottom cover steel plate and the inner steel plate of the isolator are researched.Some factors are considered,such as the constraints at the top of isolator,shear modules of the inner rubber,the ratio between thickness of one inner rubber and thickness of one inner steel plate etc.The results show that the maximum value of Mises stresses of the inner steel plate and the maximum value of normal stresses in the radius direction of the inner steel plate,are about 4 and 2.5 times the vertical pressures respectively;the stresses of steel of isolator are affected by the constraints at the top of isolator,especially for the upper cover steel plate of isolator.There is no effect on the stresses of the inner steel plate of isolator while changing shear modules of the inner rubber of isolator. The change of ratio between the diameter of core and the diameter of isolator will affect the distribution of the stresses of inner steel plate near the core.The ratio between thickness of inner rubber and thickness of inner steel plate has considerable influence on Mises stresses and normal stresses(in radial and circumferential direction of isolator) of the inner steel plate,but slight influence on the vertical normal stresses of the inner steel plate.
引文
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[2]李扬,李自力.铅芯橡胶支座参数对隔震储罐地震响应的影响[J].四川建筑科学研究,2009,35(4):171- 176. Li Y,Li Z L.The influence of isolator characteristics on the seismic response of base-isolated tank[J]. Sichuan Building Science,2009,35(4):171-176.
[3]钟先锋.高层隔震结构的非线性时程分析[J].长春工程学院学报(自然科学版),2009,10(1):35-39. Zhong X F.Non-linear time-history analysis for highlevel isolation structure[J].Journal of Changchun Institute of Technology(Natural Sciences Edition), 2009,10(1):35-39.
[4]Cheng S L,Xin Y J,Wang H D.Experimental and theoretical study on vibration control of base-isolation with energy transducer[J].Journal of Harbin Institute of Technology,2009,(2):165-171.
[5]颜学渊,张永山,王焕定,等.三类三维隔震抗倾覆支座力学性能试验研究[J].振动与冲击,2009,28(10):49- 53. Yan X Y,Zhang Y S,Wang H D,et al.Experimental study on mechanical properties of three kinds of three-dimensional base isolation and overturn-resistance devices[J].Journal of Vibration and Shock, 2009,28(10):49-53.
[6]李黎,叶昆,江宜城.橡胶铅芯隔震支座力学性能的温度效应研究[J].华中科技大学学报(城市科学版),2009,26(3):1-3. Li L,Ye K,Jiang Y C.Thermal effect on the mechanical behavior of lead-rubber bearing[J].Journal of Huazhong University of Science and Technology (Urban Science Edition),2009,26(3):1-3.
[7]马华,北村春幸,李振宝,等.隔震橡胶垫极限性能足尺试验结果与评价[J].世界地震工程,2008,24(1): 82-87. Ma H,Kitamura H,Li Z B,et al.Thermal effect on the mechanical behavior of lead-rubber bearing[J]. World Earthquake Engineering,2008,24(1):82-87.
[8]庄学真,沈朝勇,金建敏.桥梁高阻尼橡胶支座力学性能试验研究[J].地震工程与工程振动,2006,25(5): 208-212. Zhuang X Z,Shen C Y,Jin J M.Experimental study on mechanical property of high damping rubber bearing for bridge[J].Earthquake Engineering and Engineering Vibration,2006,25(5):208-212.
[9]韩强,刘文光,杜修力,等.橡胶隔震支座竖向性能试验研究[J].辽宁工程技术大学学报(自然科学版), 2006,25(2):217-219. Han Q,Liu W G,Du X L,et al.Test study on vertical property of rubber isolators[J].Journal of Liaoning Technical University(Natural Science Edition), 2006,25(2):217-219.
[10]李慧,寇巍巍,杜永峰.天然橡胶隔震支座温度相关性有限元模拟[J].低温建筑技术,2009,31(6):46-48. Li H,Kou W W,Du Y F.Simulation of temperature properties of natural rubber bearings[J].Low Temperature Architecture Technology,2009,31(6):46- 48.
[11]江宜城,聂肃非,叶志雄,等.多铅芯橡胶隔震支座非线性力学性能试验研究及其显式有限元分析[J].工程力学,2008,25(7):11-17. Jiang Y C,Nie S F,Ye Z X,et al.Experimental study on mechanical properties of multi-lead rubber bearing and its explicit finite element analysis[J].Engineering Mechanics,2008,25(7):11-17.
[12]Mineo T,Hideyuki T,Ryuichi T.Finite-element analysis of laminated rubber bearing used in base-isolation system[J].Rubber Chemistry and Technology, 1992,65(1):46-62.
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