汶川大地震曲线梁桥震害及破坏机理分析
|
摘要
以汶川大地震中严重破坏的回澜立交桥为例,基于数值模拟手段并结合现场震害调查,分析了回澜立交桥的地震破坏机理。数值分析表明,地震时设有支座的最矮的1号桥墩支座发生滑移破坏,以致刚度较大(次矮)的2号刚构桥墩承受很大的地震惯性力,2号墩首先发生弯曲屈服,此后随延性发展因抗剪能力不足最终发生剪切破坏直至倒塌损毁,呈现典型的弯剪破坏特征。现场震害调查发现,回澜立交桥震害集中于抗弯刚度较大的刚构墩上,而其余桥墩震害相对较轻,主要表现为混凝土保护层的脱落、混凝土开裂以及墩顶支座的滑移破坏等。数值分析结果与震害调查呈现出较好的一致性。
The seismic damage mechanism of Huilan interchange,which was severely damaged during Wenchuan earthquake,was studied through numerical simulation and post-earthquake investigation.The simulation results show that the bearing at the top of the most shortest No.1 pier was firstly damaged due to sliding.Then,seismic action concentrated on the next shortest No.2 rigid frame pier which has a larger stiffness.No.2 pier firstly yielded in flexure,and as the lateral displacement increased,the No.2 pier was dominated by shear capacity,and eventually failed in flexure-shear modes.By field investigation,it was found that the short rigid frame piers with largest lateral stiffness suffered severely damage while other piers suffered slight-to-moderate damage,which including concrete cover spalling,concrete cracking and sliding damage of the rubber bearing on the top of piers.It is concluded that the simulation results agree well with post-earthquake investigations.
The seismic damage mechanism of Huilan interchange,which was severely damaged during Wenchuan earthquake,was studied through numerical simulation and post-earthquake investigation.The simulation results show that the bearing at the top of the most shortest No.1 pier was firstly damaged due to sliding.Then,seismic action concentrated on the next shortest No.2 rigid frame pier which has a larger stiffness.No.2 pier firstly yielded in flexure,and as the lateral displacement increased,the No.2 pier was dominated by shear capacity,and eventually failed in flexure-shear modes.By field investigation,it was found that the short rigid frame piers with largest lateral stiffness suffered severely damage while other piers suffered slight-to-moderate damage,which including concrete cover spalling,concrete cracking and sliding damage of the rubber bearing on the top of piers.It is concluded that the simulation results agree well with post-earthquake investigations.
引文
[1]Li J Z,Peng T B,Xu Y.Damage investigation of girder bridges under the Wenchuan earthquake and corresponding seismic design recommendations[J]. Earthquake Engineering and Engineering Vibration, 2008,7(4):337-344.
[2]孙治国,王东升,郭迅,等.汶川大地震绵竹市回澜立交桥震害调查[J].地震工程与工程振动,2009,29(4): 132-138. Sun Z G,Wang D S,Guo X,et al.Damage investigation of Huilan interchange in Mianzhu after Wenchuan earthquake[J].Earthquake Engineering and Engineering Vibration,2009,29(4):132-138.
[3]王东升,郭迅,孙治国,等.汶川大地震公路桥梁震害初步调查[J].地震工程与工程振动,2009,29(3):84- 94. Wang D S,Guo X,Sun Z G,et al.Damage to highway bridges during Wenchuan earthquake[J].Earthquake Engineering and Engineering Vibration,2009, 29(3):84-94.
[4]Tseng W S,Penzien J.Seismic analysis of long multiple-span highway bridges[J].Earthquake Engineering and Structural Dynamics,1975,4(1):1-24.
[5]Tseng W S,Penzien J.Seismic response of long multiple-span highway bridges[J].Earthquake Engineering and Structural Dynamics,1975,4(1):25-48.
[6]Williams D,Godden W.Seismic response of long curved bridge structures;experimental model studies [J].Earthquake Engineering and Structural Dynamics, 1979,7(2):107-128.
[7]Kawashima K,Penzien J.Theoretical and experimental dynamic behavior of a curved model bridge structure [J].Earthquake Engineering and Structural Dynamics, 1979,7(2):129-145.
[8]Fenves G,Elley M.Behavior and Failure Analysis of A Multiple-frame Highway Bridge in the 1994 Northridge Earthquake[R].Berkeley:Pacific Earthquake Engineering Research Center,1998.
[9]Malhotra P K,Huang M J,Shakal A F.Seismic interaction at separation joints of an instrumented concrete bridge[J].Earthquake Engineering and Structural Dynamics,1995,24(8):1055-1067.
[10]Desroches R,Fenves G L.Evaluation of recorded earthquake response of a curved highway bridge[J]. Earthquake Spectra,1997,13(3):363-386.
[11]Mwafy A,Elnashai A,Yen W H.Implications of design assumptions on capacity estimates and demand predictions of multispan curved bridges[J].Journal of Bridge Engineering,ASCE,2007,12(6):710-726.
[12]王东升,杨海红,艾庆华.不规则钢筋混凝土梁桥抗震性能评价N2方法[J].哈尔滨工业大学学报,2007,39 (12):1993-1997. Wang D S,Yang H H,Ai Q H.N2 method for seismic performance evaluation of irregular RC bridges [J].Journal of Harbin Institute of Technology,2007, 39(12):1993-1997.
[13]高晓安.曲线桥梁抗震设计方法研究[D].北京:中国建筑科学研究院,2003. Gao X A.Research on the seismic design method for curved bridges[D].Beijing;China Academy of Building Research,2003.
[14]王丽,周锡元,闫维明.曲线梁桥地震响应的简化分析方法[J].工程力学,2006,23(6):77-84. Wang L,Zhou X Y,Yan W M.Simplified analysis method for seismic response of curved bridges[J].Engineering Mechanics,2006,23(6):77-84.
[15]朱东生,刘世忠,虞庐松.曲线桥地震反应研究[J].中国公路学报,2002,15(3):42-48. Zhu D S,Liu S Z,Yu L S.Research on seismic response of curved girder bridges[J].China Journal of Highway and Transport,2002,15(3):42-48.
[2]孙治国,王东升,郭迅,等.汶川大地震绵竹市回澜立交桥震害调查[J].地震工程与工程振动,2009,29(4): 132-138. Sun Z G,Wang D S,Guo X,et al.Damage investigation of Huilan interchange in Mianzhu after Wenchuan earthquake[J].Earthquake Engineering and Engineering Vibration,2009,29(4):132-138.
[3]王东升,郭迅,孙治国,等.汶川大地震公路桥梁震害初步调查[J].地震工程与工程振动,2009,29(3):84- 94. Wang D S,Guo X,Sun Z G,et al.Damage to highway bridges during Wenchuan earthquake[J].Earthquake Engineering and Engineering Vibration,2009, 29(3):84-94.
[4]Tseng W S,Penzien J.Seismic analysis of long multiple-span highway bridges[J].Earthquake Engineering and Structural Dynamics,1975,4(1):1-24.
[5]Tseng W S,Penzien J.Seismic response of long multiple-span highway bridges[J].Earthquake Engineering and Structural Dynamics,1975,4(1):25-48.
[6]Williams D,Godden W.Seismic response of long curved bridge structures;experimental model studies [J].Earthquake Engineering and Structural Dynamics, 1979,7(2):107-128.
[7]Kawashima K,Penzien J.Theoretical and experimental dynamic behavior of a curved model bridge structure [J].Earthquake Engineering and Structural Dynamics, 1979,7(2):129-145.
[8]Fenves G,Elley M.Behavior and Failure Analysis of A Multiple-frame Highway Bridge in the 1994 Northridge Earthquake[R].Berkeley:Pacific Earthquake Engineering Research Center,1998.
[9]Malhotra P K,Huang M J,Shakal A F.Seismic interaction at separation joints of an instrumented concrete bridge[J].Earthquake Engineering and Structural Dynamics,1995,24(8):1055-1067.
[10]Desroches R,Fenves G L.Evaluation of recorded earthquake response of a curved highway bridge[J]. Earthquake Spectra,1997,13(3):363-386.
[11]Mwafy A,Elnashai A,Yen W H.Implications of design assumptions on capacity estimates and demand predictions of multispan curved bridges[J].Journal of Bridge Engineering,ASCE,2007,12(6):710-726.
[12]王东升,杨海红,艾庆华.不规则钢筋混凝土梁桥抗震性能评价N2方法[J].哈尔滨工业大学学报,2007,39 (12):1993-1997. Wang D S,Yang H H,Ai Q H.N2 method for seismic performance evaluation of irregular RC bridges [J].Journal of Harbin Institute of Technology,2007, 39(12):1993-1997.
[13]高晓安.曲线桥梁抗震设计方法研究[D].北京:中国建筑科学研究院,2003. Gao X A.Research on the seismic design method for curved bridges[D].Beijing;China Academy of Building Research,2003.
[14]王丽,周锡元,闫维明.曲线梁桥地震响应的简化分析方法[J].工程力学,2006,23(6):77-84. Wang L,Zhou X Y,Yan W M.Simplified analysis method for seismic response of curved bridges[J].Engineering Mechanics,2006,23(6):77-84.
[15]朱东生,刘世忠,虞庐松.曲线桥地震反应研究[J].中国公路学报,2002,15(3):42-48. Zhu D S,Liu S Z,Yu L S.Research on seismic response of curved girder bridges[J].China Journal of Highway and Transport,2002,15(3):42-48.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心