高低墩铁路刚构连续梁受力特性分析

Analysis of the Force Characteristics of Continuous Steel Girders with High and Low Piers for Railways

文中以某特大刚构连续梁桥为依托,通过MIDAS建立高低墩连续刚构桥的仿真模型,对施工过程以及成桥状态下的全桥结构的受力特性进行分析,验证模型的准确性和桥梁的稳定性。结果表明:桥梁合龙方案对梁体成桥后的挠度变化有着直接的影响,中跨合龙段两侧梁端标高相对差值最多调整5.7cm;在活载作用下跨中最大挠度为28mm,满足规范限值要求,结构设计满足实际工程要求。

Based on a mega steel continuous girder bridge, a simulation model of a continuous steel bridge with high and low piers was established by MIDAS to analyses the construction process and the stress characteristics of the whole bridge structure in the completed state to verify the accuracy of the model and the stability of the bridge. The results show that the bridge closure scheme has a direct influence on the deflection changes of the girders after the bridge is completed, and the hanging baskets can make the relative difference in elevation of the girders on both sides of the mid-span closure section adjustable by up to 5.7cm;the maximum deflection in the span under live load is 28mm, which satisfies the specification limits and the structural design meets the actual engineering requirements.