强震作用下大跨斜拉桥伸缩缝处碰撞效应的影响研究

PDF(1720 KB)

振动与冲击 ›› 2011, Vol. 30 ›› Issue (6) : 26-30.

论文

强震作用下大跨斜拉桥伸缩缝处碰撞效应的影响研究

邓育林1; 彭天波2;李建中2

作者信息 +

Effect of Pounding at Expansion Joints on Seismic Response of Long-span Cable-stayed Bridge under Strong Earthquakes

Deng Yu-lin1 ; Peng Tian-bo2; Li Jian-zhong2

Author information +

文章历史 +

摘要

大跨斜拉桥一般采用飘浮体系或者弹性约束体系，其在强震作用下梁端会发生很大位移，梁端的过大位移可能会导致主梁与相邻跨引桥的碰撞，使整个结构丧失整体性。本文针对强震作用下大跨斜拉桥伸缩缝处的碰撞现象，以一座典型大跨斜拉桥为例，建立了考虑引桥墩柱、塔柱弹塑性的空间非线性碰撞模型，采用非线性时程法研究了大跨斜拉桥伸缩缝处相邻跨梁体碰撞对桥梁结构地震反应的影响。研究结果表明：由于大跨桥梁结构主、引桥结构体系不同，在强震作用下主引桥相邻梁体易发生碰撞，碰撞不仅会产生很大的撞击力，而且使引桥地震力需求、引桥梁端位移、主引桥相对位移及引桥梁体搭接长度需求有较大增长，极易造成引桥的落梁或者破坏；而碰撞效应对主桥的地震需求影响较

Abstract

For a long-span cable-stayed bridge, it is often required that the main tower be essentially elastic under strong earthquake. Therefore, a seismic isolation structural system is often adopted to reduce the seismic response, and the seismic displacement at the end of the deck may severely exceed the allowance which due to the occurrence of the pound between the main span and the approach span usually which can causes the collision of falling-beams and structures under strong earthquakes. In thi paper, based on the pounding phenomenon at expansion joints of long-span cable-stayed bridge under strong earthquake and employing a typical long-span cable-stayed bridges, the complex nonlinear model that considered the elasto-plastic behaviors of piers and pylon and the pound responses between the main span and the approach span was developed. With the time history analysis method of determining the nonlinear seismic responses，the pounding efects of adjacent girders at expansion joints on seismic responses of long-span cable-stayed bridge were studied. The results indicate that the pounding can amplify the seismic demand of piers of the approach span and also can amplify the displacement of beam of the approach span, the relative displacement between main span and approach span and the hinge seat width of beam of approach span obviously and it causes easily the collision of falling-beams and structures under strong earthquakes. But the pounding has minor effects on seismic demand of the main span

导出引用

邓育林;彭天波;李建中. 强震作用下大跨斜拉桥伸缩缝处碰撞效应的影响研究[J]. 振动与冲击, 2011, 30(6): 26-30

Deng Yu-lin;Peng Tian-bo;Li Jian-zhong. Effect of Pounding at Expansion Joints on Seismic Response of Long-span Cable-stayed Bridge under Strong Earthquakes[J]. Journal of Vibration and Shock, 2011, 30(6): 26-30