京沪高速铁路沧德特大桥地震反应分析
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摘要
沧德特大桥为京沪高速铁路上的一座(80+128+80)m连续梁桥,为评估该桥的抗震性能,建立全桥有限元动力分析模型,进行动力特性分析、弹性及弹塑性时程反应分析,并根据2009年版《铁路工程抗震设计规范》三水准抗震设防要求进行抗震性能验算。分析结果表明:该桥纵向、横向1阶自振周期均小于1.0s,与地震动的主要周期存在共振成分,地震反应较大;多遇地震作用下,桥墩及桩基础的强度满足规范要求;设计地震作用下,支座抗剪能力满足规范要求;罕遇地震作用下,桥墩纵、横向抗剪能力及塑性铰区的变形能力均满足规范要求。该桥满足了"小震不坏,大震不倒"的抗震设防目标。
The Cangde Bridge is a(80+128+80)m continuous beam bridge on the BeijingShanghai High Speed Railway.In order to appraise the seismic performance of the bridge,the finite element dynamic analytical model of the overall bridge was set up to carry out the dynamic property analysis,elasticity and elasto-plastic time history analysis,and the seismic performance was checked in accordance with the requirements of three-level seismic prevention suggested in the Code for Seismic Design of Railway Engineering(2009Edition).The results of the analysis indicated that in both the longitudinal and transverse directions,the 1st order natural vibration period was less than 1.0s,which had resonant proportion with the main seismic vibration periods and the seismic response is greater.Under the action of low-level earthquakes,strength of the piers and the pile foundations could meet the code requirements.Under the action of design earthquakes,the shear bearing capacity of the bearings were able to meet the code requirements;and in case of the high-level earthquakes,the shear bearing capacity of piers in both the longitudinal and transverse directions and the deformability in the plastic hinge region were able to meet the code requirements.The bridge meets the seismic defense principle of"no damages occurring under low-level earthquakes and being not able to collapse under high-level earthquakes".
The Cangde Bridge is a(80+128+80)m continuous beam bridge on the BeijingShanghai High Speed Railway.In order to appraise the seismic performance of the bridge,the finite element dynamic analytical model of the overall bridge was set up to carry out the dynamic property analysis,elasticity and elasto-plastic time history analysis,and the seismic performance was checked in accordance with the requirements of three-level seismic prevention suggested in the Code for Seismic Design of Railway Engineering(2009Edition).The results of the analysis indicated that in both the longitudinal and transverse directions,the 1st order natural vibration period was less than 1.0s,which had resonant proportion with the main seismic vibration periods and the seismic response is greater.Under the action of low-level earthquakes,strength of the piers and the pile foundations could meet the code requirements.Under the action of design earthquakes,the shear bearing capacity of the bearings were able to meet the code requirements;and in case of the high-level earthquakes,the shear bearing capacity of piers in both the longitudinal and transverse directions and the deformability in the plastic hinge region were able to meet the code requirements.The bridge meets the seismic defense principle of"no damages occurring under low-level earthquakes and being not able to collapse under high-level earthquakes".
引文
[1]王克海.桥梁抗震研究[M].北京:中国铁道出版社,2007.
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[8]揭志羽,卫星,李亚东,等.大跨高墩小半径刚构连续组合梁桥地震响应分析[J].桥梁建设,2013,43(1):52-57.
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[11]Applied Technology Council.Improved Seismic Design Criteria for California Bridges:Provisional Recommendations[Z].Redwood City:Applied Technology council,1996.
[2]李小珍,雷虎军.基于多点激励的刚构-连续组合梁桥行波效应分析[J].桥梁建设,2012,42(6):33-38.
[3]禚一,王菲.罕遇地震城际铁路连续梁桥延性抗震设计[J].铁道工程学报,2012,(4):66-72.
[4]邓小伟.基于两水平设防的连续梁桥抗震性能分析[J].石家庄铁道大学学报,2012,25(4):39-42.
[5]王晓黎.某高速铁路连续梁桥桥墩地震反应分析[J].世界桥梁,2012,40(4):38-41.
[6]王克海,孙永红,韦韩,等.汶川地震后对我国结构工程抗震的几点思考[J].公路交通科技,2008,25(11):54-59.
[7]徐秀丽,赵习刚,沈小平,等.盆式橡胶支座连续梁桥抗震性能优化设计研究[J].世界桥梁,2011,(5):40-43.
[8]揭志羽,卫星,李亚东,等.大跨高墩小半径刚构连续组合梁桥地震响应分析[J].桥梁建设,2013,43(1):52-57.
[9]范立础,卓卫东.桥梁延性抗震设计[M].北京:人民交通出版社,2001.
[10]JTG/T B02-01-2008,公路桥梁抗震设计细则[S].
[11]Applied Technology Council.Improved Seismic Design Criteria for California Bridges:Provisional Recommendations[Z].Redwood City:Applied Technology council,1996.
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