深水桥墩在地震作用下的动力响应分析
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摘要
针对在地震作用下处于深水中的桥墩受到较大的的动力影响,导致结构产生较大的变形和应力,对整个桥梁的安全性造成严重的破坏.重点分析了以有限元理论为基础的数值分析法,并结合某桥的桥墩实例,利用ANSYS有限元软件建立模型,输入调整后的Taft地震波,采用时程分析方法对其进行地震反应分析.计算数据表明:有水工况下墩顶的位移和桩底应力较无水时均有明显的增加,最大位移和最大应力也发生在考虑水的作用下的工况下.在地震作用的作用下,深水桥墩的内力和位移时程图的衰减速度也要慢于无水时的工况,水对桥墩的动力响应起着不良作用.
Under the action of earthquake,piers are subjected to large dynamic effect in deep water,this caused the structure to produce large deformations and stress and the security of the entire bridge can be caused severe damage.This paper describes some calculation methods of dynamic hydraulic on underwater piers,focusing on analysis of the finite element numerical analysis method based on the theory,and emphatically analyzes numerical analysis method based on the theory of finite element.We combine a pier for example,establishing model by finite element software ANSYS,entering the adjusted Taft seismic waves,analyzing seismic response with the method of time history analysis.The calculation results show that:under the conditions of water,the pier top displacement and pile bottom stress are bigger than the anhydrous condition,the maximum displacement and maximum stress occur also in the condition of water.Under the action of water,the degenerative speed about the time history diagram of internal force and displacement is slower than the anhydrous condition.At the time of seismic time-history analysis on piers,water plays a negative role on dynamic response of the structures.
Under the action of earthquake,piers are subjected to large dynamic effect in deep water,this caused the structure to produce large deformations and stress and the security of the entire bridge can be caused severe damage.This paper describes some calculation methods of dynamic hydraulic on underwater piers,focusing on analysis of the finite element numerical analysis method based on the theory,and emphatically analyzes numerical analysis method based on the theory of finite element.We combine a pier for example,establishing model by finite element software ANSYS,entering the adjusted Taft seismic waves,analyzing seismic response with the method of time history analysis.The calculation results show that:under the conditions of water,the pier top displacement and pile bottom stress are bigger than the anhydrous condition,the maximum displacement and maximum stress occur also in the condition of water.Under the action of water,the degenerative speed about the time history diagram of internal force and displacement is slower than the anhydrous condition.At the time of seismic time-history analysis on piers,water plays a negative role on dynamic response of the structures.
引文
[1]高学奎,李辉.近场地震作用下深水桥墩的地震响应分析[J].工程抗震与加固改造,2006,28(3):83-87.
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[4]李悦,宋波.动水对斜拉桥结构动力响应影响研究[J].土木工程学报,2010,43(12):94.
[5]宋波,张国明,李悦.桥墩与水相互作用的振动台试验研究[J].北京科技大学学报,2010,32(3):403.
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[8]戴大农,王勖成,杜庆华.流固耦合系统动力响应的模态分析理论[J].固体力学学报,1990,11(4):305-312.
[2]WESTERGAARD H M.Water pressure on damsduring earthquakes[J].TransAm Soc CivEng,1933(98):418.
[3]赖伟,王君杰,胡世德.地震下桥墩动水压力分析[J].同济大学学报,2004,32(1):1-5.
[4]李悦,宋波.动水对斜拉桥结构动力响应影响研究[J].土木工程学报,2010,43(12):94.
[5]宋波,张国明,李悦.桥墩与水相互作用的振动台试验研究[J].北京科技大学学报,2010,32(3):403.
[6]LYSMER J,KULEMEYER R L.Finite dynamicmodel for infinite media[J].J.Eng.Mech.Div.ASCE,1969(6):759-877.
[7]VELETSOS A S,PRASAD A M,HAHN G.Fluid-structure interaction effects for offshore structures[J].Earthquake Engineering and Structural Dynam-ics,1988(16):631-652.
[8]戴大农,王勖成,杜庆华.流固耦合系统动力响应的模态分析理论[J].固体力学学报,1990,11(4):305-312.
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