铁道标准设计Issue(2)：65-68,4.DOI:10.13238/j.issn.1004-2954.2015.02.016
大跨连续梁桥减隔震方案对比分析
Comparative Analysis of Isolation Schemes for Long-span Continuous Girder Bridge
董擎1
作者信息
- 1. 兰州新区城市发展投资有限公司，兰州 730087
- 折叠
摘要
Abstract
Taking a long-span urban continuous girder bridge with spans of ( 90+170+90 ) m as the research objective, this paper proposes two isolation schemes for comparison and analysis. Structural seismic response under earthquake action of E1 and E2 is studied with elastic response spectrum method and nonlinear time history response analysis method. The differences in structural seismic response and in the selection of mechanical parameters for the friction pendulum bearing ( FPB ) related to the two schemes are compared. The results show that: ( 1 ) because only one braking pier is set up at one continuous unit in the longitudinal direction for the long-span continuous girder bridge, the structural internal force distribution is extremely uneven in the longitudinal direction, but the structural internal force distribution is comparatively more uniform in transverse direction, and each individual pier shares the stress;(2)FPB has obvious damping effect on the internal forces of the bridge substructure both in longitudinal and transverse directions and internal force distribution for individual pier tends to be more even and reasonable. (3) the internal force at pier bottom obtained by use of FPB under E2 is usually less than that obtained from seismic elastic response under E1 . Whether FPB is allowed to slide or not under E1 will have a significant effect on structural seismic response, which needs to be carefully analyzed and compared in the design.关键词
连续梁桥/摩擦摆支座/减隔震方案/非线性/地震反应Key words
Continuous girder bridge/FPB/Isolation schemes/Nonlinear/Seismic response分类
交通工程引用本文复制引用
董擎..大跨连续梁桥减隔震方案对比分析[J].铁道标准设计,2015,(2):65-68,4.
