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武广客运专线是我国目前建设的线路里程最长、技术标准最高、投资规模最大的铁路客运专线,采用上部大型建筑与下部桥梁共同组成的“桥建合一”新型结构,该新型结构动力性能和结构稳定分析难度大。基于移动荷载作用下简支梁动力响应计算的基本理论,采用ANSYS大型通用软件建立了移动荷载列-桥梁的数值计算模型,其中将列车荷载简化为移动的荷载列。计算了桥梁的自振频率、变形及加速度等动力响应,得到了桥梁支座处的反力时程曲线及其富氏谱,同时分析了桥梁盆式橡胶支座橡胶块弹性性能对桥梁动力响应的影响。计算结果表明在限定的车速下,桥梁不会发生共振,且桥梁的频率、变形及加速度等各项技术指标均满足相关规定,表明桥梁的动力设计是合理的。
The Wuhan-Guangzhou Passenger Dedicated Line is a new type of passenger dedicated railway line with the longest line mileage, the highest technical standard and the largest investment scale in our country. It adopts a new structure of “bridge construction and integration” consisting of a large upper part of the building and a lower part of the bridge. Dynamic performance and structural stability analysis difficult. Based on the basic theory of dynamic response calculation of simply supported beams under moving loads, the numerical calculation model of moving load columns - bridges is established by using the general software ANSYS, in which the train loads are simplified as the moving load columns. The dynamic responses such as natural frequency, deformation and acceleration of the bridge are calculated. The reaction time history curve and its Foucault spectrum at the bridge abutment are obtained. At the same time, the elastic response of the bridge pot rubber bearing block to the bridge dynamic response Impact. The calculation results show that the bridge will not resonate under the limited vehicle speed, and all the technical indexes such as the frequency, deformation and acceleration of the bridge satisfy the relevant regulations, which shows that the dynamic design of the bridge is reasonable.