汶川地震跨断裂带小鱼洞大桥地震破坏分析
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摘要
以汶川地震跨小鱼洞断裂带的小鱼洞大桥地震破坏为研究背景,通过对其震后现场的实地勘察分析,建立了小鱼洞大桥多点地震动激励的动力分析数值模型。考虑到断裂带两侧地震强度的区别,采用三角级数法模拟人工地震波时选用不同的地震峰值加速度,然后对其进行地震破坏数值分析,重点讨论了桥梁地震破坏的薄弱部位及其破坏原因。数值模拟结果基本体现了小鱼洞大桥的实际破坏状况,证明了数值分析模型的有效性。
Based on seismic failure of Xiaoyudong bridge across Xiaoyudong fault zone in Wenchuan earthquake,multi-support excitation numerical model for dynamic analysis of the bridge was established after investigating the post-earthquake field.Considering the difference of earthquake intensities in both sides of the fault zone,artificial earthquake waves were simulated by trigonometric series method with different seismic peak accelerations.Then the seismic failure numerical analysis was carried out,the weak areas of seismic failure and their reasons were discussed particularly.Numerical simulation result embodies actual failure conditions of Xiaoyudong bridge on the whole and demonstrates the validity of the analysis model.
Based on seismic failure of Xiaoyudong bridge across Xiaoyudong fault zone in Wenchuan earthquake,multi-support excitation numerical model for dynamic analysis of the bridge was established after investigating the post-earthquake field.Considering the difference of earthquake intensities in both sides of the fault zone,artificial earthquake waves were simulated by trigonometric series method with different seismic peak accelerations.Then the seismic failure numerical analysis was carried out,the weak areas of seismic failure and their reasons were discussed particularly.Numerical simulation result embodies actual failure conditions of Xiaoyudong bridge on the whole and demonstrates the validity of the analysis model.
引文
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[4]李海兵,付小方,司家亮,等.汶川地震(Ms8.0)地表破裂及其同震右旋斜向逆冲作用[J].地质学报,2008,82(12):1623-1643.LI Haibing,FU Xiaofang,SI Jialiang,et al.Co-seisimic Sur-face Rupture and Dextral-slip Oblique Thrusting of the Ms 8.0Wenchuan Earthquake[J].Acta Geological Sinica,2008,82(12):1623-1643.
[5]胡聿贤,何训.考虑相位谱的人造地震动反应谱拟合[J].地震工程与工程振动,1986,6(2):37-51.HU Yuxian,HE Xun.Phase Angle Consideration in Generat-ing Response Spectrum Compatible Ground Motion[J].Earth-quake Engineering and Engineering Vibration,1986,6(2):37-51.
[6]杜修力,陈厚群.地振动随机模拟及其参数确定方法[J].地震工程与工程振动,1994,14(4):1-12.DU Xiuli,CHEN Houqun.Random Simulation and Its Param-eter Determination Method of Earthquake Ground Motion[J].Earthquake Engineering and Engineering Vibration,1994,14(4):1-12.
[7]霍俊荣.近场强地面运动的衰减规律[D].哈尔滨:国家地震局工程力学研究所,1989.HUO Junrong.Attention Study of the Relation on Near FieldStrong Ground Motion[D].Harbin:Institute of EngineeringMechanics,State Seismological Bureau,1989.
[8]中华人民共和国交通部.JTJ 034-2000公路路面基层施工技术规范[S].北京:人民交通出版社,2000.P.R.China.Ministry of Communications.JTJ034-2000 Tech-nical Specification of Construction of Highway Roadbases[S].Beijing:China Communications Press,2000.
[9]范立础.桥梁抗震[M].上海:同济大学出版社,1997.FAN Lichu.Aseismic Design of Bridge[M].Shanghai:TongjiUniversity Press,1997.
[10]范立础,胡世德,叶爱君,等.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001.FAN lichu,HU Shide,YE Aijun,et al.Seismic Design ofLong Span Bridge[M].Beijing:China CommunicationsPress,2001.
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