多跨混凝土连续梁桥隔震措施研究

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发布时间：2021-09-11

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多跨混凝土连续梁桥隔震措施研究
许
(福州大学土木工
莉，祁皑
程学院，福建福州350108)
摘要：采用合适的隔震措施是改善多跨连续梁桥固定墩承受过大地震力作用的有效方法。
以某六跨混凝土连续梁桥为工程背景，通过有限元软件ANSYS计算分析，在该桥中间墩处分别设
摩擦摆支座和减震球型支座2种隔震体系，研究2种隔震体系对桥梁地震响应的影响规律。结果
表明：2种隔震措施均能有效地降低顺桥向桥墩内力和位移，因此隔震体系与抗震体系相比受力更
为合理；从支座的竖向承载力和回复刚度等方面考虑，摩擦摆支座具有显著的优点，因此建议此类
连续梁桥采取隔震措施时采用摩擦摆支座。
关键词：连续梁桥；隔震措施；减震球型支座；摩擦摆支座；地震响应；动力分析；有限元法
中图分类号：U448．21；TU352．12 文献标志码：A
Study of Seismic Isolation M easures for M ulti-
Span Concrete Continuous Girder Bridge
XU Li，
(School of Civil Engineering，Fuzhou
QI A￡
University，Fuzhou 350108，China)
Abstract：To take the proper seismic isolation measures for the fixed piers of multi—span con—
crete continuous girder bridge is an effective way to improve the piers subj ected to the action of
seismic force．In this paper，a six—span concrete continuous girder bridge was cited as an example
and by means of the finite element software ANSYS，two kinds of the seismic isolation systems of
the friction pendulum bearings and seismic mitigation spherical bearings respectively arranged on
the intermediate piers of the bridge were calculated and analyzed and the laws of influences of the
two kinds of the systems on the seismic responses of the bridge were studied．The results of the
study indicate that the two kinds of the systems can effectively reduce the internal forces and dis—
placement of the piers in the longitudinal direction of the bridge．In comparison with the seismic
resistant system ，the force conditions of the seismic isolation system are more reasonable and in
consideration of the vertical bearing capacity and resilient stiffness of the bearings，the friction
pendulum bearings have obvious advantage and it is therefore proposed that the pendulum bear—
ings should be selected for such type of the bridges where the seismic isolation measures are re—
quired to be taken．
Key words：continuous girder bridge；seismic isolation measure；seismic mitigation spherical
bearing；friction pendulum bearing；seismic response；dynamic analysis；finite element method
1 引言
多跨混凝土连续梁桥具有结构刚度大、变形小
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作者简介：
的特点，在我国有着广泛的应用。但是对于连续梁
桥来说，绝大多数上部结构的地震作用都是由固定