预应力混凝土空心板桥铰缝模型化与铰缝剪应力传递机理分布

发布时间：2018-10-17 22:03

【摘要】：本文首先对河南省道高速公路安阳新乡段加宽一期改造工程某桥进行有限元分析。通过考虑材料非线性,截面接触非线性等因素,探究铰缝和空心板之间的应力应变对结构的影响,并确定桥梁铰缝传力具有明显的局部性。集中荷载作用于空心板桥梁时,荷载梁两侧铰缝受力最大,其它铰缝受力较小,且铰缝受力主要集中于荷载作用的位置,其余位置均较小。其次通过设计中间布置铰缝的简支梁进行试验,即一种空心板桥铰缝承载力试验试件。对铰缝构造的破坏形态,开裂荷载,裂缝宽度,铰缝张开量等破坏模式进行试验研究。以此探究铰缝受力状况,极限荷载,以及破坏机理,同时通过有限元软件ABAQUS对试验构件进行非线性分析以及试验尺寸效应研究,确定铰缝受力范围以及剪力传递分布机理。主要结论如下:均布荷载作用下,铰缝传递荷载范围成椭圆形分布,作用区域纵、横向长度分别为5倍和3倍的空心板宽度。试验过程中,铰缝腹部承受较大荷载,增加铰缝深度是控制铰缝破坏和增强铰接板横向刚度的有效措施。构件破坏的主要原因是铰缝抗剪钢筋锚固长度不够。铰缝混凝土破坏主要的两个重要因素是铰缝内部的横向拉应力和竖向剪应力。
[Abstract]:In this paper, the finite element analysis of a bridge in the first stage widening project of Anyang Xinxiang Section of Henan Province Road Expressway is carried out. The influence of stress and strain between hinged joints and hollow slabs on the structure is investigated by considering material nonlinearity and cross-section contact nonlinearity, and it is determined that the transmission force of bridge hinged joints has obvious locality. When the concentrated load is applied to the hollow slab bridge, the stress of the hinge joint on both sides of the load beam is the largest, while that of the other joints is small, and the stress of the hinge joint is mainly concentrated in the position where the load is acted on, and the other positions are smaller. Secondly, simply supported beams with hinged joints are designed to test the bearing capacity of hinged joints of hollow slab bridges. The failure modes of hinged joints, such as failure mode, crack load, crack width, joint opening and so on, are studied experimentally. In this paper, the stress condition, ultimate load and failure mechanism of hinged joints are discussed. At the same time, the nonlinear analysis and size effect of test members are carried out by finite element software ABAQUS to determine the stress range and shear force transfer distribution mechanism of hinged joints. The main conclusions are as follows: under uniform load, the load range of hinge joints is elliptical, and the width of hollow slab is 5 times and 3 times of transverse length, respectively. In the process of test, the joint underside is subjected to a large load, and increasing the depth of the hinge joint is an effective measure to control the failure of the hinge joint and enhance the transverse stiffness of the hinged plate. The main reason for the failure of the member is that the anchor length of the hinge joint shear-resistant steel bar is not enough. The transverse tensile stress and vertical shear stress are the two main factors in the failure of hinged concrete.
【学位授予单位】：华北水利水电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441

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