椒江特大桥长联连续梁地震响应分析
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摘要
杭绍台铁路椒江特大桥为四线高速铁路,位于低烈度地震区,根据该桥的重要程度以及地震破坏后桥梁结构修复的难易程度确定抗震性能目标。分别采用反应谱法、规范法、非线性时程法分析多遇地震、设计地震、罕遇地震作用下的桥梁结构地震响应。分析表明在多遇地震作用下桥梁结构处于弹性工作阶段,地震后不损坏;在设计地震作用下桥梁支座符合规范要求;在罕遇地震作用下桥梁结构处于弹塑性工作阶段,墩底塑性铰进入开裂状态,但不会出现整体倒塌。验证了低烈度地震区长联连续梁不采取减隔震措施可以符合抗震性能目标,给出了类似工程抗震性能设计的建议。
Located in a low-intensity seismic area,the Jiaojiang River Mega Bridge of the Hang-Shao-Tai Railway is a part of one of the four lines high-speed railway.The anti-earthquake performance targets for the mega bridge are decided according to the importance of the bridge and the difficulty of repairing the bridge structure after being damaged by an earthquake.The earthquake responses of the bridge structure under the action of common earthquakes,the designed earthquakes and rare earthquakes are analyzed respectively with the response spectrum method,the normal method and the non-linear time-history method.The result of the analyses shows that the bridge structure under the action of common earthquakes is at the stage of elastic work,and will not be damaged after the earthquake.Under the action of the designed earthquakes,the pedestals of the bridge are still in agreement with the requirements of the technical specifications.Under the action of rare earthquakes,the bridge structure is at the stage of the elastic-plastic work,with the plastic hinge at the bottom of the pier cracked,but the bridge structure will not wholly collapse.With no shock isolation measures taken,the long continuous beam can still meet the requirements in anti-earthquake performance targets in the low-intensity seismic area.Suggestions on the design of anti-earthquake performance for other similar projects are also presented in the paper.
Located in a low-intensity seismic area,the Jiaojiang River Mega Bridge of the Hang-Shao-Tai Railway is a part of one of the four lines high-speed railway.The anti-earthquake performance targets for the mega bridge are decided according to the importance of the bridge and the difficulty of repairing the bridge structure after being damaged by an earthquake.The earthquake responses of the bridge structure under the action of common earthquakes,the designed earthquakes and rare earthquakes are analyzed respectively with the response spectrum method,the normal method and the non-linear time-history method.The result of the analyses shows that the bridge structure under the action of common earthquakes is at the stage of elastic work,and will not be damaged after the earthquake.Under the action of the designed earthquakes,the pedestals of the bridge are still in agreement with the requirements of the technical specifications.Under the action of rare earthquakes,the bridge structure is at the stage of the elastic-plastic work,with the plastic hinge at the bottom of the pier cracked,but the bridge structure will not wholly collapse.With no shock isolation measures taken,the long continuous beam can still meet the requirements in anti-earthquake performance targets in the low-intensity seismic area.Suggestions on the design of anti-earthquake performance for other similar projects are also presented in the paper.
引文
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[3]秦煜,杨超华,吴多,等.速度锁定器理论模型及铁路桥梁抗震实用性分析[J].高速铁路技术,2018,9(02):5-8
[4]刘正南,陈兴冲,马华军,等.高速铁路大跨长联连续梁桥减隔震方案优化研究[J].世界地震工程,2017,33(04):129-134
[5]中华人民共和国铁道部.无缝线路设计规范:TB 10015—2012[S].北京:中国铁道出版社,2013
[6]中华人民共和国建设部.铁路工程抗震设计规范(2009年版):GB 50111—2006[S].北京:中国计划出版社,2009
[7]竹晓华.连续刚构桥地震反应分析[J].铁道工程学报,2008,25(10):15-19
[8]钟铁毅,吕吉应,张常勇.铁路隔震连续梁桥地震碰撞响应研究[J].中国铁道科学,2012(03):16-20