连续刚构桥沥青混凝土桥面铺装线性及非线性受力特性分析

发布时间：2018-12-28 17:07

【摘要】：沥青混凝土铺装层是桥面行车体系的重要组成部分,其受力模式与一般的路面结构有所差异,若处置不当,更容易出现病害。目前,,在进行桥梁结构设计时,沥青混凝土铺装层仅作为构造层来考虑,一般不作专门的计算分析,并且对于超载、车速和阻尼等因素对沥青混凝土铺装层影响的分析也有限。本文依托雷西高速公路上的一座连续刚构桥,对该桥沥青混凝凝土铺装层进行线性和非线性有限元受力分析。首先对沥青混凝土铺装层的病害类型进行归纳总结并阐述了病害的成因。第二,利用Midas有限元软件建立全桥模型,计算全桥最不利截面的内力值,从而确定桥面铺装层的最不利位置。第三,利用Abaqus有限元软件建立最不利位置处沥青混凝土铺装层的局部模型,逐一研究沥青混凝土铺装层在超载、不同车速和沥青混凝土阻尼、不同水平荷载、移动荷载和孔洞积水结冰等因素影响下的力学性能。为更真实模拟行车荷载对沥青混凝土铺装层的影响,本文分别采用移动荷载加载和单次动态加载两种模式,研究发现沥青混凝土铺装层在移动荷载作用下应力的变化规律与采用单次动态加载分析相差不大；另外本文还从混凝土弹性模量、水泥品种和加载龄期等方面探讨了主梁混凝土收缩徐变对沥青混凝土铺装层受力性能的影响；此外,本文还分析了沥青混凝土铺装层内孔洞的位置、大小和形状等因素对沥青混凝土铺装层的影响,结果表明,沥青混凝土铺装层内孔洞积水结冰会对其产生极为不利的影响。以上述研究结果为基础,针对沥青混凝土铺装层的施工工艺,从温度控制、沥青混凝土的碾压和层间粘结等方面提出了相应的措施。同时,为进一步确保沥青混凝土铺装层施工质量,本文建议在连续刚构桥沥青混凝土铺装层施工过程中采用施工质量动态控制方法。
[Abstract]:Asphalt concrete pavement is an important part of bridge deck driving system, and its stress mode is different from that of general pavement structure. At present, in the design of bridge structure, asphalt concrete pavement is only considered as structural layer, and generally does not make special calculation and analysis, and for overload, The influence of speed and damping on asphalt concrete pavement is also limited. Based on a continuous rigid frame bridge on the Raixi Expressway, the linear and nonlinear finite element analysis of the asphalt coagulant layer of the bridge is carried out in this paper. First, the disease types of asphalt concrete pavement are summarized and the causes of the disease are expounded. Secondly, the Midas finite element software is used to establish the full bridge model and to calculate the internal force of the most unfavorable section of the bridge, so as to determine the most unfavorable position of the bridge deck pavement. Thirdly, the local model of asphalt concrete pavement at the most unfavorable position is established by using Abaqus finite element software, and the asphalt concrete pavement under overload, different speed, asphalt concrete damping and different horizontal load is studied one by one. The mechanical properties are affected by moving load and freezing of pore water. In order to simulate the effect of driving load on asphalt concrete pavement, moving load and single dynamic loading are used in this paper. It is found that the stress variation of asphalt concrete pavement under moving load is not different from that of single dynamic loading. In addition, the influence of shrinkage and creep of main beam concrete on the mechanical properties of asphalt concrete pavement is discussed from the aspects of elastic modulus of concrete, variety of cement and loading age. In addition, the influence of the position, size and shape of the holes in the asphalt concrete pavement on the asphalt concrete pavement is analyzed. The accumulation of water in the holes in the asphalt concrete pavement will have an adverse effect on it. Based on the above research results, the corresponding measures are put forward for the construction technology of asphalt concrete pavement from the aspects of temperature control, asphalt concrete roller compaction and interlayer bonding. At the same time, in order to further ensure the construction quality of asphalt concrete pavement, this paper suggests that the construction quality dynamic control method should be adopted in the construction process of asphalt concrete pavement of continuous rigid frame bridge.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.33

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