为研究桩柱式桥台在地震过程中的结构响应规律。本文首先分析了现有研究的不足；然后，以某立交G匝道曲线梁桥的桥台为工程背景，开展了基于实体的地震反应研究，并对地震过程中桥台背墙自底部向上各位置的位移时程曲线进行监测。在此基础上，对桥台高度、土体剪胀角度、土体与桥台接触条件三个因素对桥台地震响应的影响开展了研究。研究发现：随着桥台高度的增加，台背最大位移的放大系数逐渐变大；在本文范围内，土体剪胀角对桥台地震位移响应影响不大；当不考虑桥台与土体分离效应时桥台顶部地震响应比考虑桥台与土体分离时的地震响应小，建议在进行桥台抗震设计中应准确模拟土体与桥台的接触界面状态。本文研究成果可为桥台结构的地震响应研究提供参考依据。
Abstract
This paper aims to study the structural response law of abutments during earthquake.Firstly, the seismic damage of abutments in previous earthquakes at home and abroad was analyzed.Secondly, taking the abutment of a G ramp curved girder bridge as the engineering background, the seismic response research of the abutment by solid element method were carried out, and the displacement time history in each unit of the abutment back wall from the bottom to the top during the earthquake was monitored.After that, three factors such as the abutment height, soil shear expansion angle, and the contact condition between soil and abutment which influence the abutment seismic response of abutment were studied.It can be concluded that: with the increase of abutment height, the amplification coefficient of maximum displacement of abutment back becomes larger; within the scope of this work, the shear expansion angle of soil has little effect on the seismic displacement response of abutment; when the separation effect of abutment and soil is considered, the seismic response at the top of abutment is larger than that obtained when the separation effect of abutment and soil is not considered.It is suggested that the contact state between soil and abutment should be accurately simulated in seismic design of abutment.The results can provide reference for the seismic response research of abutment structure.
关键词
曲线桥 /
土-桥台相互作用 /
ABAQUS /
数值模拟 /
抗震性能
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Key words
curved bridge /
soil-abutment interaction /
ABAQUS software /
numerical simulation /
seismic performance
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