IFA装置连续梁桥减震性能研究
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摘要
为满足温度荷载引起的变形需求,连续梁桥一般一联只设置一个固定墩,地震作用下,固定墩承担几乎全部上部结构的纵向水平地震荷载,固定墩处于十分不利的受力状态。为了充分利用滑动墩的抗震潜力,协同固定墩抵抗地震作用,解决固定墩单独承受水平地震荷载的问题,提出一种构造简单、维护方便,以惯性力激活的减震装置(IFA装置)。基于某7跨连续梁桥,利用ANSYS软件建立有限元模型,阐述装置的工作原理,研究装置对等高与非等高连续梁桥减震性能的影响。研究结果表明,IFA装置发挥作用后,上部地震荷载将按刚度分配的原则传递至各滑动墩,实现滑动墩和固定墩的协同受载,可有效提高连续梁桥的整体抗震性能,但应用于非等高连续梁桥时需注意对矮墩的能力保护。
In order to meet the demand of deformation caused by temperature load,only one fixed pier is usually installed in the continuous beam bridge. Under the action of earthquake,the fixed pier bears almost all horizontal seismic load of the superstructure,and it is in a very unfavorable stress state. In order to make full use of the seismic potential of sliding piers in cooperation with the fixed pier to resist the earthquake action and to solve the problem that the fixed pier withstands the horizontal seismic load alone,a seismic absorption device( IFA device) with simple structure,convenient maintenance and activation by inertial force is proposed. Based on a seven-span continuous beam bridge,the finite element model is established by using ANSYS software. The working principle of the device's seismic absorption is elaborated and the influence of IFA device on the seismic absorption of the equal and non-equal high continuous beam bridges is researched. The research results show that when the IFA device works,the upper seismic load will be transmitted to the sliding piers according to the principle of stiffness distribution. The synergistic loading of the sliding piers and the fixed pier can effectively improve the overall seismic absorption performance of the continuous beam bridge. However,for non-equal high continuous beam bridge,attention should be paid to the protection of the short piers' ability.
In order to meet the demand of deformation caused by temperature load,only one fixed pier is usually installed in the continuous beam bridge. Under the action of earthquake,the fixed pier bears almost all horizontal seismic load of the superstructure,and it is in a very unfavorable stress state. In order to make full use of the seismic potential of sliding piers in cooperation with the fixed pier to resist the earthquake action and to solve the problem that the fixed pier withstands the horizontal seismic load alone,a seismic absorption device( IFA device) with simple structure,convenient maintenance and activation by inertial force is proposed. Based on a seven-span continuous beam bridge,the finite element model is established by using ANSYS software. The working principle of the device's seismic absorption is elaborated and the influence of IFA device on the seismic absorption of the equal and non-equal high continuous beam bridges is researched. The research results show that when the IFA device works,the upper seismic load will be transmitted to the sliding piers according to the principle of stiffness distribution. The synergistic loading of the sliding piers and the fixed pier can effectively improve the overall seismic absorption performance of the continuous beam bridge. However,for non-equal high continuous beam bridge,attention should be paid to the protection of the short piers' ability.
引文
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[2]王宏谋.桥梁盆式橡胶支座的研究与应用[D].成都:西南交通大学,2008.
[3]顾正伟,钟铁毅,张贞阁.双曲面球型减隔震支座曲线连续梁桥的减隔震[J].中国铁道科学,2011,32(3):47-51.
[4]马涌泉,陈水生.基于汶川地震的LRB与RB隔震连续梁桥地震响应对比研究[J].世界地震工程,2012,28(1):130-134.
[5]陈彦江,郭凯敏,李勇,等.桥梁高阻尼隔震橡胶支座性能试验研究[J].振动与冲击,2015,34(9):136-140,148.
[6]王宝夫,韩强,杜修力.滑动摩擦支座隔震桥梁地震反应分析[J].土木工程学报,2016,49(S2):85-90.
[7]汤虎,李建中.连续梁桥固定墩减震设计方法研究[J].土木工程学报,2011,44(12):64-72.
[8]周友权.粘滞阻尼器在金水沟特大桥中的应用研究[J].铁道标准设计,2012(2):66-69,77.
[9]吴从晓,周云,邓雪松.钢铅粘弹性阻尼器试验研究[J].工程力学,2012,29(3):150-155,162.
[10]宋子威,蔡小培.粘滞性阻尼器在高速铁路长联大跨连续梁中的应用[J].清华大学学报(自然科学版),2012,52(8):1102-1105.
[11]郑晓龙,樊启武,金怡新,等.速度锁定支座的设计与减震性能分析[J].铁道工程学报,2015,32(10):73-78.
[12]颜志华,马良喆,陈永祁.速度锁定装置在津秦客运专线减震设计中的应用[J].桥梁建设,2014,44(1):95-100.
[13]陈士通,张文学,杜修力,等.锁死销对连续梁桥地震响应的影响[J].桥梁建设,2015,45(3):37-43.
[14]王新敏. ANSYS工程结构数值分析[M].北京:人民交通出版社,2007.
[15]王新敏,李义强,许宏伟.ANSYS结构分析单元与应用[M].北京:人民交通出版社,2011.