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双曲面球型减隔震支座震后自复位性能研究

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为研究桥梁双曲面球型减隔震支座的震后自复位性能并评价现有表征方法,采用公式推导、试验和有限元计算方法,综合对比分析支座的静态残余位移和震后残余位移.基于支座结构推导静态残余位移理论公式,并以竖向设计承载力5 000 kN支座为例,进行支座自复位性能的拟静力试验验证;进行双曲面球型减隔震支座模拟地震振动台试验,分析静态残余位移和震后残余位移的差别;以32 m跨典型铁路混凝土简支箱梁为背景,建立MIDAS Civil有限元模型,通过非线性时程分析方法,分析单次和连续2次地震波输入工况下支座的震后残余位移和自复位能力.结果表明:支座静态残余位移为支座等效曲率半径与支座等效摩擦系数的乘积,支座自复位性能的静态残余位移与理论值较为符合,二者偏差为4.92％;振动台试验和非线性时程分析下的支座震后残余位移平均值均为2 mm左右,均低于静态残余位移的5％;双曲面球型减隔震支座支承下的桥梁减隔震体系可以避免产生累积性的震后残余位移,具有强复位能力,而目前用静态残余位移来评价双曲面球型减隔震支座的震后自复位性能较为不妥.
Research on Recentering of Double Concave Curved Surface Isolators
The theoretical calculation,numerical simulation and tests were conducted to examine the recentering capability of the double concave curved surface(DCCS)isolators after earthquakes and evaluate existing expressions.The static and post-earthquake residual displacements of the DCCS isolators were compared and analyzed.The DCCS isolators with a design vertical load bearing capacity of 5 000 kN were taken for case study.Based on the static residual displacements calculated by theoretical formulas,quasi-static tests were performed to verify the recentering capacity of the isolators.Shake table tests were carried out to analyze the differences between the static residual displacements and the post-earthquake residual displacements.The finite element model of a typical simply-supported box girder railway bridge with spans of 32 m was developed in MIDAS Civil to analyze the post-earthquake residual displacement and recentering capacity of isolators in the contexts of one-time seismic wave input and two consecutive times of seismic wave input,respectively,by using a non-linear time history analysis method.It is shown that the static residual displacement of the isolator equals the product of the equivalent curvature radius and the equivalent friction coefficient of the isolator,and the static residual displacement of the recentering capacity of the isolator agrees well with the theoretical value,leaving a deviation of 4.92％.The average post-earthquake residual displacement between the results of the shake table test and the non-linear time history analysis is about 2 mm,lower than 5％of the static residual displacement.DCCS isolators prevent the occurrence of cumulative post-earthquake residual displacement in a bridge,displaying sound recentering capacity.It is not proper to evaluate the post-earthquake recentering capacity of the DCCS isolators using the static residual displacement.

bridge engineeringdouble concave curved surface isolatorpost-earthquake recentering capacityresidual displacementshake table testtime history analysisfinite element method

王勇、顾海龙、宋建平、李恒跃

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中船双瑞(洛阳)特种装备股份有限公司,河南洛阳 471000

桥梁工程 双曲面球型减隔震支座 震后自复位性能 残余位移 振动台试验 时程分析 有限元法

河南省科技重大专项(创新示范专项)

191110212200

2024

10.20051/j.issn.1003-4722.2024.02.012

桥梁建设
中铁大桥局集团有限公司

桥梁建设

CSTPCD北大核心
影响因子：1.428
ISSN：1003-4722
年,卷(期)：2024.54(2)
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