梁的约束对液化场地桥台震害模式的影响分析
发布时间：2019-05-15 23:13
【摘要】：为深入研究液化场地梁的约束对桥台震害模式的影响,首先在对唐山地震中胜利桥震害调查的基础上,采用有限元软件UWLC对该桥震害进行数值模拟分析,并将数值模拟结果与实际震害结果进行对比验证。研究结果表明:数值模拟结果与实际震害结果基本一致,说明采用UWLC软件进行震害数值模拟分析是可行的。然后对有、无桩基条件下梁的约束力和液化层厚度对桥台震害模式的影响分别进行数值模拟分析。研究结果表明:在地震作用下,桥梁发生落梁破坏后会导致桥台的滑移破坏更为严重。与无桩基的重力式桥台不同,桩基桥台的震害模式均表现为前倾式破坏,这主要是因为桩基础限制了桥台底部的水平移动。梁的约束力对桩基桥台震后残余位移的影响程度要明显小于无桩基桥台。对于重力式桥台,液化砂层对地震波的中高频段有一定滤波作用,反映出液化层的减震作用;而对于桩基桥台,由于桩-土-台身的相互作用,液化砂层的减震效果不明显。
[Abstract]:In order to deeply study the influence of the constraints of liquefied site beams on the seismic damage model of the bridge, firstly, based on the investigation of the earthquake damage of Shengli Bridge in Tangshan earthquake, the finite element software UWLC is used to simulate and analyze the seismic damage of the bridge. The numerical simulation results are compared with the actual earthquake damage results. The results show that the numerical simulation results are basically consistent with the actual earthquake damage results, which indicates that it is feasible to use UWLC software to carry out the numerical simulation analysis of earthquake damage. Then the effects of the binding force of the beam and the thickness of the liquefied layer on the seismic damage mode of the bridge deck are simulated and analyzed respectively under the condition of no pile foundation. The results show that under the action of earthquake, the sliding failure of the bridge platform will be more serious after the falling beam failure of the bridge occurs. Different from the gravity bridge without pile foundation, the earthquake damage mode of pile foundation bridge is forward tilting failure, which is mainly because the pile foundation limits the horizontal movement of the bottom of the bridge platform. The influence of the binding force of the beam on the residual displacement of the pile foundation bridge after earthquake is obviously smaller than that of the bridge without pile foundation. For gravity bridge, liquefied sand layer has a certain filtering effect on the middle and high frequency band of seismic wave, reflecting the damping effect of liquefied layer, while for pile foundation bridge, due to the interaction of pile, soil and platform, the damping effect of liquefied sand layer is not obvious.
【作者单位】： 大连交通大学土木与安全工程学院;沈阳市市政工程设计研究院;
【基金】：国家自然科学基金项目(51208073) 辽宁省“百千万人才工程”人选项目择优资助(2014921061) 辽宁省高等学校优秀人才支持计划资助(LJQ2014049) 大连市高层次人才创新支持计划项目(2015R073)
【分类号】：U442.55
，
本文编号：2477839
[Abstract]:In order to deeply study the influence of the constraints of liquefied site beams on the seismic damage model of the bridge, firstly, based on the investigation of the earthquake damage of Shengli Bridge in Tangshan earthquake, the finite element software UWLC is used to simulate and analyze the seismic damage of the bridge. The numerical simulation results are compared with the actual earthquake damage results. The results show that the numerical simulation results are basically consistent with the actual earthquake damage results, which indicates that it is feasible to use UWLC software to carry out the numerical simulation analysis of earthquake damage. Then the effects of the binding force of the beam and the thickness of the liquefied layer on the seismic damage mode of the bridge deck are simulated and analyzed respectively under the condition of no pile foundation. The results show that under the action of earthquake, the sliding failure of the bridge platform will be more serious after the falling beam failure of the bridge occurs. Different from the gravity bridge without pile foundation, the earthquake damage mode of pile foundation bridge is forward tilting failure, which is mainly because the pile foundation limits the horizontal movement of the bottom of the bridge platform. The influence of the binding force of the beam on the residual displacement of the pile foundation bridge after earthquake is obviously smaller than that of the bridge without pile foundation. For gravity bridge, liquefied sand layer has a certain filtering effect on the middle and high frequency band of seismic wave, reflecting the damping effect of liquefied layer, while for pile foundation bridge, due to the interaction of pile, soil and platform, the damping effect of liquefied sand layer is not obvious.
【作者单位】： 大连交通大学土木与安全工程学院;沈阳市市政工程设计研究院;
【基金】：国家自然科学基金项目(51208073) 辽宁省“百千万人才工程”人选项目择优资助(2014921061) 辽宁省高等学校优秀人才支持计划资助(LJQ2014049) 大连市高层次人才创新支持计划项目(2015R073)
【分类号】：U442.55
，
本文编号：2477839
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