The main ship channel bridge of the Hutong Changjiang River Bridge is a rail-cum-road continuous steel truss girder cable-stayed bridge with a main span of 1 092 m .On both sides of the main ship channel bridge are the 112-m span simply-supported steel truss girder bridges and between the main ship channel bridge and the steel truss girder bridges ,the girder end expansion devices of ± 900 mm movement amount are arranged .To investigate the influences of the expan-sion devices of the bridge on the dynamic responses of the train and bridge ,the train-track-bridge dynamic performance was studied based on the comparative schemes in the preliminary design of the expansion devices .The complete structural model ,including the main ship channel bridge , steel truss girder bridge and girder end expansion device ,was established according to the actual conditions and the train-bridge coupling vibration was analyzed ,using the step-by-step integration method .The results of the study demonstrate that the deformation of the girder end expansion de-vices and the track structures on the main ship channel bridge and the steel truss girder bridges on both sides has differences and the local irregularity in the areas nearby the girder ends causes im-pact to the train and expansion devices ,which will cause excessive responses of the train under some load cases .The acceleration of the supporting girders of the bridge is some high as compared to the relevant design in the girder end expansion device scheme for Tongling Changjiang River Bridge and particularly in the contraction state of the main girder , the said situation is more evident .%沪通长江大桥主航道桥为主跨1 092 m的公铁两用连续钢桁梁斜拉桥,主航道桥两侧为跨度112 m的钢桁简支梁桥 ,主航道桥、钢桁梁桥间设置伸缩量为± 900 m m的梁端伸缩装置.为考察该桥伸缩缝对列车和桥梁动力响应的影响 ,针对其梁端伸缩装置初步设计的比选方案进行车线桥动力性能研究.按照实际情况建立包括主航道桥、钢桁梁桥和梁端伸缩装置的完整桥梁结构模型 ,采用逐步积分法分析车桥耦合振动.结果表明 ,梁端伸缩装置与两侧主航道桥、钢桁梁桥上的轨道结构变形存在差异 ,此梁端附近区域的局部不平顺造成了对车辆和伸缩装置的冲击 ,使得部分工况下车辆响应超限 ,支承梁的加速度与铜陵长江大桥的梁端伸缩装置设计方案相比偏高 ,尤其在主梁收缩状态下 ,上述情况更为明显.
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