曲线梁桥的实体有限元模型与预应力作用

Solid finite element model and pre-stress effects of curved concrete bridge

为了研究预应力荷载对混凝土曲线梁桥典型病害的影响,基于通用有限元软件ABAQUS建立了混凝土曲线梁桥实体有限元模型,研究了预应力钢束的模拟及预应力作用实现的方法,通过与试验数据对比分析,验证了该建模方法的可靠性。采用上述建模方法对一独柱支承的混凝土曲线梁桥进行了预应力效应数值分析。研究结果表明:预应力荷载可在曲线梁桥中产生较大的扭转效应,尤其在小半径曲线梁桥设计中不容忽视;设计中对预应力产生的扭转认识不足,是混凝土曲线梁桥产生"典型病害"的主要原因之一。

To study the influence of pre-stressed force on the typical problems of the curved concrete bridges,a solid finite element model of curved concrete bridge was firstly set up based on ABAQUS software and the method for simulating the tendons and applying the tension to curved concrete bridge was studied.The modeling method was then verified by test and then used in the numerical analysis of a curved concrete bridge supporting with a single column. Analysis results showed that pre-stressed forces may generate large torsion effect in curved concrete bridge, especially in the bridges with small radius. The lack of its understanding is one of the main reasons for typical problems of curved concrete bridges.