斜梁桥上部结构施工阶段横向应力分析

发布时间：2018-04-09 10:31

本文选题：斜交箱梁　切入点：预应力　出处：《东北林业大学》2014年硕士论文

【摘要】：在桥梁的布置过程中,不可避免的会受到复杂地形、水利条件等因素的影响,使得箱形梁不能或很难呈正交角度跨越障碍物,斜交箱梁桥就是在这种情况下产生、发展并且被广泛应用。相对于正交箱梁桥而言,斜交箱梁桥能够很好的适应地形地物的限制,合理跨越障碍物,使得路线整体平顺流畅。在预应力混凝土斜交箱梁桥被广泛应用的过程中,发现已建的一些桥梁产生了纵向裂缝。针对这一现象,本文对在施工阶段预应力混凝土斜梁桥的横向应力进行分析,为预应力混凝土斜梁桥的设计和施工提供一定的理论依据和参考。本文以预应力混凝土斜交箱梁桥——知行桥为研究背景,对试验箱梁在施工阶段的混凝土横向受力情况进行了测试,获得了大量的实测应变数据。利用有限元软件ANSYS建立有限元数值分析模型,对试验桥梁的施工过程、满堂支架等进行模拟,模型计算的理论值与试验值吻合较好。建立不同斜度、有无横向预应力钢筋的斜交箱梁数值分析模型,对比分析斜度、横向预应力在施工阶段对斜交箱梁桥横向受力的影响。通过分析实测混凝土应变数据,对比斜交箱梁不同截面横向应力的分布情况,得出试验箱梁1#跨跨中截面、3/4截面、1#墩顶支点截面及2#跨跨中截面的横向应力分布特点及规律；通过所建立的不同斜交角度的数值分析模型,总结出斜度的大小对箱梁横向应力分布的影响；对比有无横向预应力钢筋箱梁各截面的横向应力,得出横向预应力对斜交箱梁横向应力的影响。
[Abstract]:In the process of bridge arrangement, it will inevitably be affected by complex terrain, water conservancy conditions and other factors, which make box girder can not or very difficult to cross obstacles in orthogonal angle, which is the case of skew box girder bridge.Develop and be widely used.Compared with the orthogonal box girder bridge, the skew box girder bridge can adapt to the limitation of terrain and ground objects, cross the obstacle reasonably, and make the whole route smooth and smooth.In the process of extensive application of prestressed concrete skew box girder bridge, longitudinal cracks have been found in some bridges that have been built.In view of this phenomenon, this paper analyzes the transverse stress of prestressed concrete skew beam bridge in construction stage, which provides certain theoretical basis and reference for the design and construction of prestressed concrete skew beam bridge.In this paper, based on the research background of prestressed concrete skew box girder bridge, the transverse force of concrete in the construction stage of the test box girder is tested, and a large number of measured strain data are obtained.The finite element numerical analysis model is established by using the finite element software ANSYS. The construction process of the test bridge and the full hall support are simulated. The theoretical value of the model is in good agreement with the experimental value.A numerical analysis model of skew box girder with or without transverse prestressing bar is established, and the influence of transverse prestress on lateral force of skew box girder bridge in construction stage is compared and analyzed.By analyzing the measured concrete strain data and contrasting the transverse stress distribution of different cross sections of skew box girder, the characteristics and rules of transverse stress distribution of the top fulcrum section of the pier and the cross section of 2# span in the middle section of the central span of the test box girder are obtained.Through the numerical analysis model of different oblique angles, the influence of slope on the transverse stress distribution of box girder is summarized, and the transverse stress of each section of box girder with or without transverse prestressing bar is compared.The influence of transverse prestress on transverse stress of skew box girder is obtained.
【学位授予单位】：东北林业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445;U441.5

【共引文献】