跨断层桥梁结构地震响应影响
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摘要
以一座跨走滑断层连续梁桥为研究对象,利用混合模拟法合成该桥地面运动时程曲线,采用非一致激励时程法对其地震响应进行计算,并以断层穿越位置、穿越角度、墩高布置为分析参数,研究了上述参数对跨断层桥梁地震响应的影响。结果表明:(1)断层穿越位置、穿越角度、墩高布置方式对跨断层桥梁的地震响应具有显著影响,设计时应对此予以考虑。随着断层位置由桥梁中跨向边跨移动,其最不利地震响应呈增大趋势,结构受力偏向不利;当断层垂直穿过桥梁时,结构地震响应值相对较小,且分布合理性、经济性最优;跨断层桥梁横向最大弯矩需求并不一定发生在最高墩,而通常发生在断层同侧两个桥墩中的较高桥墩。(2)跨断层效应对桥梁结构的地震响应特征及规律影响显著,应对其进行针对性抗震设计。本文研究成果可为该类桥梁的抗震设计和桥位布置提供参考和依据。
This paper presents a study on seismic response,which influences the Bridge Crossing Active Fault(BCAF).One bridge crossing strike-slip active fault is taken as an example.The seismic ground motions at the site of the bridge are generated following a hybrid simulation methodology.Multi-support excitation displacement input models and time history analysis method are used to calculate seismic response of the structures.The fault crossing position,crossing angle,arrangement of the pier are taken as the key parameters,and their influences on the seismic response are discussed.The results show that the fault crossing position,crossing angle,arrangement of the pier are important parameters influencing the seismic responses of the bridge,which shoul be taken into consideration in the design.With the change of the fault position from the mid-span to side-span of bridge,the most disadvantageous seismic response shows a trend of increase,being unfavorable to stress of the structure.When the fault perpendicularly crosses the bridge the seismic response caused by fault dislocation is minimal,and the optimal rationality and economy for piers internal force are presented.Generally,the demand of maximum transversal bending moment of BCAF does notnecessarily occur at the highest pier,but on higher bent on the side of the fault with two bents.The structural response characteristics of the BCAF and the near fault bridge have significant influence,therefore should be paid particular attention in seismic design.The results in this research can be used as a reference to the seismic design and bridge location.
This paper presents a study on seismic response,which influences the Bridge Crossing Active Fault(BCAF).One bridge crossing strike-slip active fault is taken as an example.The seismic ground motions at the site of the bridge are generated following a hybrid simulation methodology.Multi-support excitation displacement input models and time history analysis method are used to calculate seismic response of the structures.The fault crossing position,crossing angle,arrangement of the pier are taken as the key parameters,and their influences on the seismic response are discussed.The results show that the fault crossing position,crossing angle,arrangement of the pier are important parameters influencing the seismic responses of the bridge,which shoul be taken into consideration in the design.With the change of the fault position from the mid-span to side-span of bridge,the most disadvantageous seismic response shows a trend of increase,being unfavorable to stress of the structure.When the fault perpendicularly crosses the bridge the seismic response caused by fault dislocation is minimal,and the optimal rationality and economy for piers internal force are presented.Generally,the demand of maximum transversal bending moment of BCAF does notnecessarily occur at the highest pier,but on higher bent on the side of the fault with two bents.The structural response characteristics of the BCAF and the near fault bridge have significant influence,therefore should be paid particular attention in seismic design.The results in this research can be used as a reference to the seismic design and bridge location.
引文
[1]惠迎新,王克海,李冲.跨断层地表破裂带桥梁震害研究及抗震概念设计[J].公路交通科技,2014,31(10):145-151.Hui Ying-xin,Wang Ke-hai,Li Chong.Study of seismic damage and seismic conceptual design of bridges crossing fault-rupture zones[J].Journal of Highway and Transportation Research and Development,2014,31(10):145-151.
[2]Park S W,Ghasemi H,Shen J,et al.Simulation of the seismic performance of the bolu viaduct subjected to near-fault ground motions[J].Earthquake Engineering and Structural Dynamics,2004,33:1249-1270.
[3]Ucak A,Mavroeidis G P,Tsopelas P,et al.The response of the seismically isolated Bolu Viaduct subjected to fault crossing[C]∥Structures Congress,ASCE,2013:817-826.
[4]Goel R K,Chopra A K.Linear analysis of ordinary bridges crossing fault-rupture zones[J].Journal of Bridge Engineering,2009,4(3):203-215.
[5]Goel R K,Qu B,Tures J,et al.Validation of fault rupture-response spectrum analysis method for curved bridges crossing strike-slip fault rupture zones[J].Journal of Bridge Engineering,2014,19(5):06014002.
[6]Saiidi M,Vosooghi A,Choi H,et al.Shake table studies and analysis of a two-span RC bridge model subjected to a fault rupture[J].Journal of Bridge Engineering,2014,19(8):182-190.
[7]杨怀宇,李建中.断层地震动对隔震桥梁地震响应的影响[J].同济大学学报:自然科学版,2015,43(8):1144-1152.Yang Huai-yu,Li Jian-zhong.Response analysis of seismic isolated bridge under influence of fault-crossing ground motions[J].Journal of Tongji University(Natural Science),2015,43(8):1144-1152.
[8]沈建明.客运专线铁路跨越断裂带有关问题探讨[J].铁道工程学报,2011,157(10):30-37.Shen Jian-ming.Study on relevant issues on passenger dedicated railway crossing fault zone[J].Journal of Railway Engineering Society,2011,157(10):30-37.
[9]帅少军,戴万江,罗嗣碧.跨断裂带桥梁设计研究[J].公路,2016(4):127-130.Shuai Shao-jun,Dai Wan-jiang,Luo Si-bi.Design Study of the bridges crossing fault[J].Highway,2016(4):127-130.
[10]胡盛,杨华振,罗嗣碧,等.海南铺前大桥总体设计[J].桥梁建设,2016,46(1):94-99.Hu Sheng,Yang Hua-zhen,Luo Si-bi,et al.Overall design of Puqian bridge in hainan[J].Bridge Construction,2016,46(1):94-99.
[11]惠迎新,王克海.基于多点激励位移输入模型的跨断层桥梁地震动输入方法研究[J].东南大学学报:自然科学版,2015,45(3):557-562.Hui Ying-xin,Wang Ke-hai.Earthquake motion input method for bridges crossing fault based on multisupport excitation displacement input model[J].Journal of Southeast University(Natural Science),2015,45(3):557-562.
[12]惠迎新,王克海.跨断层桥梁地震响应特性研究[J].桥梁建设,2015,45(3):70-75.Hui Ying-xin,Wang Ke-hai.Study of seismic response features of bridges crossing faults[J].Bridge Construction,2015,45(3):70-75.
[13]Somerville P.Characterizing near fault ground motion for the design and evaluation of bridges[C]//Proceedings of the 3rd National Seismic Conference and Workshop on Bridges and Highways,Portland,Oregon,2002:137-148.
[14]田玉基,杨庆山,卢明奇.近断层脉冲型地震动的模拟方法[J].地震学报,2007,29(1):77-84.Tian Yu-ji,Yang Qing-shan,Lu Ming-qi..Simulation method of near-fault pulse-type ground motion[J].ACTA Seismological Sinica,2007,29(1):77-84.
[15]Makris N,Chang S P.Effect of viscous,viscoplastic and friction damping on the response of seismic isolated structures[J].Earthquake Engineering and Structural Dynamics,2000,29:85-107.
[16]JTJ/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.
[17]Somerville P G.Magnitude scaling of the near-fault rupture directivity pulse[J].Physics of the Earth and Planetary Interiors,2003,137(1-4):201-212.
[18]田玉基,杨庆山.地震地面运动作用下结构反应的分析模型[J].工程力学,2005,22(6):170-174.Tian Yu-ji,Yang Qing-shan.Analysis models and methods for structural seismic responses[J].Engineering Mechanics,2005,22(6):170-174.
[19]Pamuk A,Kalkan E,Ling H I.Structural and geotechnical impacts of surface rupture on highway structures during recent earthquakes in turkey[J].Soil Dynamics and Earthquake Engineering,2005,25(7-10):581-589.
[2]Park S W,Ghasemi H,Shen J,et al.Simulation of the seismic performance of the bolu viaduct subjected to near-fault ground motions[J].Earthquake Engineering and Structural Dynamics,2004,33:1249-1270.
[3]Ucak A,Mavroeidis G P,Tsopelas P,et al.The response of the seismically isolated Bolu Viaduct subjected to fault crossing[C]∥Structures Congress,ASCE,2013:817-826.
[4]Goel R K,Chopra A K.Linear analysis of ordinary bridges crossing fault-rupture zones[J].Journal of Bridge Engineering,2009,4(3):203-215.
[5]Goel R K,Qu B,Tures J,et al.Validation of fault rupture-response spectrum analysis method for curved bridges crossing strike-slip fault rupture zones[J].Journal of Bridge Engineering,2014,19(5):06014002.
[6]Saiidi M,Vosooghi A,Choi H,et al.Shake table studies and analysis of a two-span RC bridge model subjected to a fault rupture[J].Journal of Bridge Engineering,2014,19(8):182-190.
[7]杨怀宇,李建中.断层地震动对隔震桥梁地震响应的影响[J].同济大学学报:自然科学版,2015,43(8):1144-1152.Yang Huai-yu,Li Jian-zhong.Response analysis of seismic isolated bridge under influence of fault-crossing ground motions[J].Journal of Tongji University(Natural Science),2015,43(8):1144-1152.
[8]沈建明.客运专线铁路跨越断裂带有关问题探讨[J].铁道工程学报,2011,157(10):30-37.Shen Jian-ming.Study on relevant issues on passenger dedicated railway crossing fault zone[J].Journal of Railway Engineering Society,2011,157(10):30-37.
[9]帅少军,戴万江,罗嗣碧.跨断裂带桥梁设计研究[J].公路,2016(4):127-130.Shuai Shao-jun,Dai Wan-jiang,Luo Si-bi.Design Study of the bridges crossing fault[J].Highway,2016(4):127-130.
[10]胡盛,杨华振,罗嗣碧,等.海南铺前大桥总体设计[J].桥梁建设,2016,46(1):94-99.Hu Sheng,Yang Hua-zhen,Luo Si-bi,et al.Overall design of Puqian bridge in hainan[J].Bridge Construction,2016,46(1):94-99.
[11]惠迎新,王克海.基于多点激励位移输入模型的跨断层桥梁地震动输入方法研究[J].东南大学学报:自然科学版,2015,45(3):557-562.Hui Ying-xin,Wang Ke-hai.Earthquake motion input method for bridges crossing fault based on multisupport excitation displacement input model[J].Journal of Southeast University(Natural Science),2015,45(3):557-562.
[12]惠迎新,王克海.跨断层桥梁地震响应特性研究[J].桥梁建设,2015,45(3):70-75.Hui Ying-xin,Wang Ke-hai.Study of seismic response features of bridges crossing faults[J].Bridge Construction,2015,45(3):70-75.
[13]Somerville P.Characterizing near fault ground motion for the design and evaluation of bridges[C]//Proceedings of the 3rd National Seismic Conference and Workshop on Bridges and Highways,Portland,Oregon,2002:137-148.
[14]田玉基,杨庆山,卢明奇.近断层脉冲型地震动的模拟方法[J].地震学报,2007,29(1):77-84.Tian Yu-ji,Yang Qing-shan,Lu Ming-qi..Simulation method of near-fault pulse-type ground motion[J].ACTA Seismological Sinica,2007,29(1):77-84.
[15]Makris N,Chang S P.Effect of viscous,viscoplastic and friction damping on the response of seismic isolated structures[J].Earthquake Engineering and Structural Dynamics,2000,29:85-107.
[16]JTJ/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.
[17]Somerville P G.Magnitude scaling of the near-fault rupture directivity pulse[J].Physics of the Earth and Planetary Interiors,2003,137(1-4):201-212.
[18]田玉基,杨庆山.地震地面运动作用下结构反应的分析模型[J].工程力学,2005,22(6):170-174.Tian Yu-ji,Yang Qing-shan.Analysis models and methods for structural seismic responses[J].Engineering Mechanics,2005,22(6):170-174.
[19]Pamuk A,Kalkan E,Ling H I.Structural and geotechnical impacts of surface rupture on highway structures during recent earthquakes in turkey[J].Soil Dynamics and Earthquake Engineering,2005,25(7-10):581-589.