|
|
|
| Shaking table tests on transverse pounding effect of high-speed railway simply-supported girder bridges under earthquake excitations |
| MENG Dongliang,GAO Qiong,YANG Menggang |
| School of Civil Engineering, Central South University, Changsha 410075, China |
|
|
|
|
Abstract The pounding occurs when the earthquake-induced transverse relative displacement between superstructures and substructures exceeds the initial gap between shear keys and girders or between shear keys and bearing bases.In order to investigate the transverse pounding effect of high-speed railway simply-supported girder bridges under earthquake excitations, taking a 32 m standard-span simply-supported girder bridge as the research object, a single-span bridge model was designed and made with the scale ratio of 1∶6.The influence of the spectral characteristic of the ground motion, peak ground acceleration (PGA), and the initial gap between shear keys and bearing bases on transverse pounding effects was studied through shaking table tests.And the anti-collision effect and isolation mechanism of rubber bumpers were also discussed.The results show that: shaking table tests could reproduce the transverse seismic pounding process of the bridge structure; the fixed bearings were not damaged under the low-level earthquake excitations, and there was no collision phenomenon between the shear keys and the bearing bases; however, the fixed bearings were damaged and most of the test cases collided under the excitations of the design and high-level earthquakes.The pounding between the shear keys and the bearing bases significantly limited the development of the transverse relative displacement between the superstructure and the substructure, but it also aroused high-frequency response of the structure, and hence, amplified the bending moment response at the bottom of the pier.The installation of the rubber bumpers would reduce the pounding stiffness and weaken the high-frequency response of the bridge structure caused by the pounding, thus reduced the seismic responses of the bridge structure.
|
|
Received: 13 June 2018
Published: 15 December 2019
|
|
|
|
[1] Earthquake Engineering Research Institute (EERI)．Northridge earthquake reconnaissance report，Vol.1［R］．Oakland：EERI，1995．
[2] LI Jianzhong，PENG Tianbo，XU Yan．Damage investigation of girder bridges under the Wenchuan earthquake and corresponding seismic design recommendations［J］．Journal of Earthquake Engineering and Engineering Vibration，2008，7(4)：337－344．
[3] 朱颖，魏永幸．汶川地震铁路工程震害特征及工程抗震设计对策思考［J］．岩石力学与工程学报，2010，29(s1)：3378－3386．
ZHU Ying，WEI Yongxing．Characteristics of railway damage due to Wenchuan earthquake and counter measure considerations of engineering seismic design［J］．Chinese Journal of Rock Mechanics and Engineering，2010，29(s1)：3378－3386．
[4] JANKOWSKI R，WILDE K，FUJINO Y．Reduction of pounding effects in elevated bridges during earthquakes［J］．Earthquake Engineering & Structural Dynamics，2000，29(2)：195－212．
[5] BI K，HAO H．Numerical simulation of pounding damage to bridge structures under spatially varying ground motions［J］．Engineering Structures，2013，46(1)：62－76．
[6] 王军文，吴天宇，闫聚考．斜交简支梁桥地震碰撞反应参数分析［J］．振动与冲击，2017，36(3)：209－214．
WANG Junwen，WU Tianyu，YAN Jukao．Parametrican analysis for seismic pounding responses of a skewed simply-supported girder bridge［J］．Journal of Vibration and Shack，2017，36(3)：209－214．
[7] 李青宁，尹俊红，张瑞杰，等．桥梁碰撞振动台试验及参数敏感性分析［J］．长安大学学报，2016，36(4)：58－65．
LI Qingning，YIN Junhong，ZHANG Ruijie，et al．Shaking table test of bridge pounding and analysis on parameter sensitivity［J］．Changan Daxue Xuebao，2016，36(4)：58－65．
[8] 李忠献，张勇，岳福青．地震作用下隔震简支梁桥碰撞反应的振动台试验［J］．地震工程与工程振动，2007，27(2)：152－157．
LI Zhongxian，ZHANG Yong，YUE Fuqing．Shaking table test on pounding responses of simply supported isolated bridges under earthquake excitation［J］．Journal of Earthquake Engineering & Engineering Vibration，2007，27(2)：152－157．
[9] GUO A X，LI Z J，LI H，et al．Experimental and analytical study on pounding reduction of base‐isolated highway bridges using MR dampers［J］．Earthquake Engineering & Structural Dynamics，2009，38(11)：1307－1333．
[10] GUO A X，LI Z J，LI H．Point-to-surface pounding of highway bridges with deck rotation subjected to bi-directional earthquake excitations［J］．Journal of Earthquake Engineering，2011，15(2)：274－302．
[11] KUN C，JIANG L，CHOUW N．Influence of pounding and skew angle on seismic response of bridges［J］．Engineering Structures，2017，148：890－906．
[12] MALEKI S．Seismic modeling of skewed bridges with elastomeric bearings and side retainers［J］．Journal of Bridge Engineering，2005，10(4)：442－449．
[13] MALEKI S．Effect of side retainers on seismic response of bridges with elastomeric bearings［J］．Journal of Bridge Engineering，2004，9(1)：95－100．
[14] GOEL R K，CHORPRA A K．Role of shear keys in seismic behavior of bridges crossing fault-rupture zones［J］．Journal of Bridge Engineering，2008，13(4)：398－408．
[15] BI K，HAO H．Modelling of shear keys in bridge structures under seismic loads［J］．Soil Dynamics & Earthquake Engineering，2015，74：56－68．
[16] 邓育林，彭天波，李建中．地震作用下桥梁结构横向碰撞模型及参数分析［J］．振动与冲击，2007，26(9)：104－107．
DENG Yulin，PENG Tianbo，LI Jianzhong．Pounding model of bridge structures and parameter analysis under transverse earthquakes［J］．Journal of Vibration and Shack，2007，26(9)：104－107．
[17] 焦驰宇，龙佩恒，李士锣，等．地震作用下中小跨度梁桥横向碰撞参数影响分析［J］．振动与冲击，2014，33(8)：48－53．
JIAO Chiyu，LONG Peiheng，LI Shiluo，et al．Parametric analysis of transverse collision of medium and small-span bridges under earthquake excitation［J］．Journal of Vibration and Shack，2014，33(8)：48－53．
[18] 王军文，李建中，范立础．非规则梁桥横桥向地震碰撞反应分析[J]．振动与冲击，2010，29(6)：26－30．
WANG junwen，LI Jiangzhong，FAN Lichu．Analysis on pounding effect of irregular girder bridges under transverse earthquake[J]．Journal of Vibration and Shack，2010，29(6)：26－30．
[19] 石岩，王军文，王东升，等．地震作用下高速铁路简支箱桥横向偏心碰撞反应分析［J］．铁道学报，2013，35(2)：99－105．
SHI Yan，WANG Junwen，WANG Dongsheng，et al．Analysis on eccentric pounding responses of simply-supported box girder bridges on high-speed railways under transverse earthquake［J］．Journal of the China Railway Society，2013，35(2)：99－105．
[20] 杨孟刚，孟栋梁，戴良缘．考虑轨道约束的高铁简支梁桥横向地震碰撞效应［J］．中南大学学报(自然科学版)，2018，49(4)：916－924．
YANG Menggang，MENG Dongliang，DAI Liangyuan．Transverse seismic pounding effect for simply-supported girder bridges of high-speed railway considering track constraint［J］．Journal of Central South University (Science and Technology)，2018，49(4)：916－
924．
[21] BOZORGZADEH A，MEGALLY S，RESTREPO J I，et al．Capacity evaluation of exterior sacrificial shear keys of bridge abutments［J］．Journal of Bridge Engineering，2006，11(5)：555－565．
[22] HAN Q，ZHOU Y L，ZHONG Z L，et al．Seismic capacity evaluation of exterior shear keys of highway bridges［J］．Journal of Bridge Engineering，2016，22(2)：04016119．
[23] HAN Q，ZHOU Y L，OU Y，et al．Seismic behavior of reinforced concrete sacrificial exterior shear keys of highway bridges［J］．Engineering Structures，2017，139：59－70．
[24] LI J，XIANG N，TANG H，et al．Shake-table tests and numerical simulation of an innovative isolation system for highway bridges［J］．Soil Dynamics & Earthquake Engineering，2016，86：55－70．
[25] 叶爱君，方家欣，张少为，等．小箱梁桥横向减震体系及其耗能特性［J］．中国公路学报，2017，30(12)：21－29
YE Aijun，FANG Jiaxing，ZHANG Shaowei，et al. Transverse seismic system of multi－box girder bridges and its energy dissipation characteristics［J］．China Journal of Highway & Transport，2017，30(12)：21－29
[26] B/T 3320—2013 铁路桥梁球型钢支座［S］．北京：中国铁道出版社，2013．
TB/T 3320—2013 Spherical bearings for railway bridges［S］．Beijing：China Railway Press，2013．
[27] American Association of State Highway and Transportation Officials．AASHTO Guide Specifications for LRFD Seismic Bridge Design［S］．Washington，DC，USA：AASHTO，2009．
[28] Masroor A，Mosqueda G．Experimental simulation of base-isolated buildings pounding against moat wall and effects on superstructure response［J］．Earthquake Engineering & Structural Dynamics，2012，41(14)：2093－2109．
[29] JANKOWSKI R．Non-linear viscoelastic modelling of earthquake‐induced structural pounding［J］．Earthquake Engineering & Structural Dynamics，2005，34(6)：595－611． |
|
|
|
