无桥台斜腿刚架桥三维弹塑性分析

Three-dimensional Elasto-plastic Analysis of Non-abutment Rigid Frame Bridge with Inclined Legs

以武汉绕城公路K46+024 5跨线桥为原型,建立三维实体模型进行弹塑性分析,模型中考虑桥与周围土体的相互作用,得到无桥台斜腿刚架桥的真实位移、应力和破坏区域的分布,并与常规设计所采用的强迫位移法进行比较,分析常规设计计算的结果与桥的真实受力状态的差别。对于相互作用问题,本文提出土体计算范围与计算跨径的合理比值,从而为该桥型的设计与计算提供有重要参考价值的科研依据。

Based on the prototype of the viaduct of Wuhan round-city road (K46+024.5),a three-dimensional model was established.The elasto-plastic analysis with the interaction between the bridge and embankment soil was carried out.The true displacements,stresses and the distribution of the damage region were obtained.Compared with the forced-displacement method in the conventional design,the difference between the present results and the true stresses of the bridge was analyzed.Furthermore,the rational ratio between the calculated region of the soil and the bridge span was proposed.The presented results provided a significant reference for the bridge design..