考虑动水压力作用的深水桥墩地震响应分析
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摘要
采用附加质量的形式考虑动水压力对桥墩的影响,以ANSYS有限元软件为计算平台,建立单墩模型并进行深水桥墩地震响应分析。得出动水压力改变桥墩的地震反应特性,增大了桥墩墩顶位移和墩底内力,并且动水压力作用还与结构本身质量和周期有关等结论。通过对连续梁桥和连续刚构桥的分析,验证了动水压力作用与结构固有周期有关,随着固有周期的增大,动水压力对结构的影响越小。
The additional mass method of water was used to demonstrate the effect of hydrodynamic pressure on the bridge pier.With the help of ANSYS finite element software,a single pier model was established to analyze the seismic response of the bridge pier in deep water.The results show that the hydrodynamic pressure effect changes the seismic response characters of the pier and increases displacement of pier top and the internal force of pier bottom,and the hydrodynamic pressure role is also connected with structure itself and the cycle.Through actual analysis of continuous bridge and continuous rigid-frame bridge,the hydrodynamic pressure function has been connected with structure of the innate cycle.Along with the increase of the innate cycle,the influence of the hydrodynamic pressure on the structure decreases.
The additional mass method of water was used to demonstrate the effect of hydrodynamic pressure on the bridge pier.With the help of ANSYS finite element software,a single pier model was established to analyze the seismic response of the bridge pier in deep water.The results show that the hydrodynamic pressure effect changes the seismic response characters of the pier and increases displacement of pier top and the internal force of pier bottom,and the hydrodynamic pressure role is also connected with structure itself and the cycle.Through actual analysis of continuous bridge and continuous rigid-frame bridge,the hydrodynamic pressure function has been connected with structure of the innate cycle.Along with the increase of the innate cycle,the influence of the hydrodynamic pressure on the structure decreases.
引文
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[2]郑史雄.深水桥梁考虑液固相互作用的地震反应分析[J].桥梁建设,1998(1):52-54.Zheng Shixiong.The effects of fluid-structure interaction seismic re-sponse of bridge piers[J].Bridge Construction,1998(1):52-54.
[3]Arnold P,Bea R G,Idriss L M.A study of soil-pile-structure sys-tems in severe earthquakes[C]//The9th Annual Offshore Technol-ogy Conference.Houston:Offshore Technology Conference,1977:27-49.
[4]柳春光,齐念.考虑流固耦合作用的深水桥墩地震响应分析[J].防灾减灾工程学报,2009,29(4):433-437 Liu Chunguang,Qi Nian.Seismic response analysis of piers in deed water considering fluid structure interaction[J].Journal of Disaster Prevention and Mitigation Engineering,2009,29(4):433-437.
[5]李玉成,滕斌.波浪对海上建筑物的作用[M].北京:海洋出版社,1993.
[6]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):55-58.Lai Wei,Wang Junjie,Hu Shide.Earthquake induced hydrody-namic pressure on bridge pier[J].Journal of Tongji University,2004,32(1):55-58.
[7]Morison J,O’Brien M,Johnson J,et al.The force exerted by sur-face wave on piles[J].Petroleum Transactions,AIME,1950,189:149-154.
[8]竺艳蓉.海洋工程波浪力学[M].天津:天津大学出版社,1991.
[9]JTG/T B02-01—2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.
[10]小坪高西.Reporton Investigation of Earthquake Hydrodynamic Pressure Experiment[M].Honshu-Shikoku:Honshu-Shikoku Bridge Construction Corporation,Institute of Foundation Technolo-gy,1995.
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