减隔震支座及黏滞阻尼器减震效果分析研究-《高速铁路技术》

文章信息/Info

Title:: Analysis of the Damping Effect of Seismic Mitigation and Isolation Bearings and Fluid Viscous Dampers

Author(s):: LI Xiaobo; China Railway Design Corporation, Tianjin 300308, China

Keywords:: long-span continuous girder bridge|hyperbolic spherical seismic isolation bearing|fluid viscous damper|damping effect

摘要:: 本文基于高烈度震区某（72+128+72）m大跨连续梁桥，采用非线性时程分析方法，研究了铁路连续梁常用双曲面球型减隔震支座的减震效果及减震机理，并采用黏滞阻尼器控制结构过大的地震位移响应。结果表明：（1）双曲面球型减隔震支座均可大幅减小结构地震内力响应，纵桥向墩底弯矩减震率在90%左右，横桥向墩底弯矩减震率在85%左右，墩梁相对位移呈非线性增大趋势；（2）在不影响双曲面球型减隔震支座减震效果的情况下，黏滞阻尼器可有效控制墩梁相对位移，但当地震高烈度较高且场地类别较差时，建议适当增大位移限值。研究结果为高速铁路大跨连续梁桥减隔震设计提供了依据。

Abstract:: Based on a (72+128+72) m long-span continuous girder bridge in a high-intensity earthquake zone, this paper studies the damping effect and mechanism of hyperboloid spherical seismic isolation bearings commonly used in railway continuous girders by using nonlinear time history analysis method, and fluid viscous dampers are used for controlling the excessive seismic displacement response of the structure. The results show that:(1) Hyperboloid spherical seismic isolation bearings can greatly reduce the structural internal force response, and the bending moment damping rate at the pier bottom is about 90% in the longitudinal direction of the bridge, and about 85% in the transverse direction of the bridge, and the relative displacement of piers and girders increases nonlinearly. (2) Fluid viscous dampers can effectively control the relative displacement of piers and girders without affecting the damping effect of hyperboloid spherical bearings. However, it is suggested that an appropriately larger displacement limit should be taken for the sites of lower category in high-intensity earthquake areas. The results provide a basis for the seismic isolation design of long-span continuous girder bridges of high-speed railways.