用于斜拉桥横向的新型油阻尼器减震性能研究  

A study on the seismic performance of a novel type of oil damper used in the transverse direction of cable-stayed bridges

作　　者：牛建涛 丁阳[1,2] 石运东 NIU Jiantao;DING Yang;SHI Yundong(School of Civil Engineering,Tianjin University,Tianjin 300350,China;Key Laboratory of Coast Civil Structure Safety of Ministry of Education,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学建筑工程学院,天津300350 [2]天津大学滨海土木工程结构与安全教育部重点实验室,天津300072

出　　处：《振动与冲击》2020年第16期55-61,111,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金面上项目(51378343);国家重点基础研究发展计划(973项目)(2011CB013606)。

摘　　要：为解决斜拉桥横向塔-梁固结体系导致地震响应过大的问题,兼顾斜拉桥横向抗风、隔震需求,研制了一种刚度可变的新型油阻尼器。论述了新型油阻尼器的工作原理,建立其恢复力模型并通过单轴动力试验进行验证;以两座斜拉桥为例,对比了新型油阻尼器与已有两种金属阻尼器的减震性能。结果表明:所建恢复力模型可准确模拟新型油阻尼器的力学行为,新型油阻尼器活塞滑动前刚度较高,活塞滑动后刚度为0;与两种金属阻尼器相比,新型油阻尼器具有更低的等效刚度和更高的耗能能力,更大幅度降低两座斜拉桥的梁端位移与塔底弯矩。In order to reduce the excessive seismic response caused by rigid connection between tower-deck in the transverse direction of cable-stayed bridges,and consider the demands of resisting wind and isolate the deck under earthquake simultaneously,a novel oil damper which has variable stiffness characteristic was designed.The mechanism of the oil damper was described in detail.The restoring force model of the oil damper was proposed,and was assessed by a uniaxial dynamic experiment.The seismic response of two cable-stayed bridges with the new type of oil damper and two types of metallic dampers was studied.The results show that,the mechanism of the oil damper can be simulated accurately with the proposed restoring force model.The stiffness of the damper is large in service condition,and reduced to 0 after the sliding of the piston.The effective stiffness of the novel oil damper is lower than the two types of metallic dampers,and the energy-dissipating capacity of the novel oil damper is larger.The displacements at the end of deck and the moments at the bottom of tower are better decreased with the novel oil damper.

关 键 词：斜拉桥 横向 减震 油阻尼器 单轴动力试验 

分 类 号：U442.54[建筑科学—桥梁与隧道工程]