Using the static and dynamic load test and finite element models to analyze the stress And deformation characteristics in different conditions of prestressed concrete continuous Curve box girder bridge, it provides a powerful proof for prestressed concrete continuous Curve box girder bridge crack prevention.
This Paper summarizes the design theory and calculation method of prestressed Concrete continuous curve box girder bridge. With prestressed concrete continuous curve Box girder bridge as the back ground, use Midas which is a finite element analysis software To analysis structure. Set five different prestressed adjustment scheme to analysis stress Changes of curve bridge and compare with the original program. Through the analysis, find Out that if the inside and outside ribs the box girders are gave asymmetric pre-stress, it can Effectively improve stress performance, reduce the bending-torsional coupling effect and prevent the cracks occurring. Analysising influence to curved girder Bridges by the different curvature radius,temperature effect and crossbeam, the deformation and stress rule of prestressed concrete continuous curve box girder bridge will be summarized and the factors influencing curve box girder bridge crack will be found.
预应力混凝土连续曲线箱梁桥以其优美、平滑、流畅的线形而成为一种非常常见的现代城市道路和高速公路桥。它能较好地满足公路平面线形要求,因此已经成为立交桥匝道的主要形式。但是连续曲线箱梁桥属于三维结构体系,其典型特点是考虑了弯扭耦合效应影响。受到弯、扭、大曲率箱梁剪滞效应和扭转变形影响的箱型截面的力学特性是非常复杂的。预应力索曲线梁在几何上是成双向弯曲形的,所以其等效力和预应力摩擦损失与直线桥相比较为复杂。
使用静态和动态加载试验以及有限元模型分析预应力混凝土连续曲线箱梁桥在不同荷载组合下的应力和变形特性,这将为预应力混凝土连续曲线箱梁桥裂缝的预防提供了一个有力的证明。
本文总结了预应力混凝土连续曲线箱梁桥的设计理论和计算方法。以预应力混凝土连续曲线箱梁桥为背景,使用Midas有限元分析软件来分析结构内力。设置五个不同预应力调整计划,分析曲线梁桥与原方案相比之下下的应力变化。通过分析,找出箱梁的内外腹板是否承受了非对称预应力,它可以有效地提高梁的受力性能,减小弯扭耦合效应,防止裂缝的产生。分析不同的曲率半径、温度效应和横梁对曲线梁桥的影响,通过总结预应力混凝土连续曲线箱梁桥的变形和应力规律找出曲线梁桥开裂的影响因素.下载本文