高速铁路简支箱梁桥准静态变形对车桥动力响应的影响研究

针对高速列车运营阶段简支箱梁桥准静态变形对轨道平顺性的影响而引起的行车安全性问题进行了分析研究。首先建立了车辆-桥梁耦合动力相互作用模型,分析了桥梁准静态变形对轨道不平顺的影响,然后以轨道不平顺作为外部激励,分析了高速铁路简支梁桥在多因素作用影响下的准静态变形对车桥动力响应的影响。分析结果表明:梁体准静态变形对桥梁的动力响应影响很小;梁体徐变上拱对车辆竖向的动力响应影响较大,温度旁弯及墩顶横向变位对车辆横向的动力响应较大;梁体徐变上拱、温度效应引起的梁体旁弯幅值达到20 mm及墩顶变位幅值达到50 mm时,桥梁及列车各动力学参数均在行车安全范围内。

Effects of quasi-static deformation of a simply supported high speed railway box girder bridge on dynamic responses of vehicle-bridge coupled system

Effects of quasi-static bridge deformation on track irregularities during high speed train operation and the caused running safety problem were studied here.Firstly,the vehicle-bridge coupled system’s dynamic interaction model was established and used to study effects of quasi-static bridge deformation on track irregularities.Then track irregularities were taken as the external excitation to analyze effects of quasi-static deformation of a simple-supported high speed railway box girder bridge under the action of multi-factor on dynamic responses of the vehicle-bridge system.The analysis results showed that effects of the bridge beam’s quasi-static deformation on the bridge’s dynamic response is very small;the beam’s upward slowly bending affects vehicle vertical dynamic response obviously,and the beam’s temperature induced lateral bending and pier-top lateral displacement affect vehicle lateral dynamic response obviously;when amplitudes of the beam’s upward slowly bending and temperature induced lateral bending reach 20 mm and the amplitude of pier-top lateral displacement reaches 50 mm,dynamic parameters of the bridge and the vehicle are all in the train running safe range.