摘要: |
本文基于云南省滇中引水工程背景,以一座主跨100 m拱桥式倒虹吸为研究对象,采用Midas Civil建立三维有限元模型,将对应场地安评报告提供的基岩地震动作为地震输入,进行多向地震作用下高架拱式倒虹吸支座减震研究,对比分别布置板式橡胶支座、聚四氟乙烯滑板式橡胶支座、铅芯橡胶支座和高阻尼橡胶支座后拱式倒虹吸动力响应。结果表明:减隔震支座的柔性支撑显著延长结构的自振周期,结构各关键组成部件的动力响应有不同程度的减小;铅芯橡胶支座与高阻尼橡胶支座具有双轴塑性,横桥向减震效果更加明显;铅芯橡胶支座和高阻尼橡胶支座具有较高的初始刚度和复位能力,可靠性更高。 |
关键词: 拱式倒虹吸 多向地震作用 减隔震支座 地震响应 有限元 |
DOI: |
分类号:TV672 |
基金项目:云南省重大科技专项计划项目(202102AF080001) |
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Seismic Damping Study of Inverted Siphon Bearings for Elevated Arches under Multidirectional Earthquakes |
WANG zhi-ming1, LONG yun1, LUO bao-xin2, WU yong-xin2, HU hong-qiang1
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1.Yunnan Dianzhong Water Diversion Engineering Co,Ltd,Kunming;2.Hohai University College of civil engineering and transportation,Nanjing
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Abstract: |
This paper based on the background of the Yunnan Central Water Diversion Project, a main span 100m arch-type inverted siphon is used as the research object, and the 3D finite element model is established by Midas Civil, and the bedrock ground vibration provided by the corresponding site safety assessment report is used as the seismic input. The dynamic response of the arch type inverted siphon after the arrangement of plate rubber bearing, Teflon sliding rubber bearing, lead-core rubber bearing and high damping rubber bearing was compared. The results show that: the flexible support of the vibration isolation bearing significantly extends the self-oscillation period of the structure, and the dynamic response of each key component of the structure is reduced to different degrees; the lead-core rubber bearing and the high-damping rubber bearing have biaxial plasticity, and the effect of vibration damping in the cross-bridge direction is more obvious; the lead-core rubber bearing and the high-damping rubber bearing have higher initial stiffness and resetting capacity, and are more reliable. |
Key words: arch inverted siphon multidirectional seismic action vibration isolation bearing seismic response Finite element |