【摘要】：瀝青混凝土鋪裝層是橋面行車體系的重要組成部分,其受力模式與一般的路面結構有所差異,若處置不當,更容易出現病害。目前,,在進行橋梁結構設計時,瀝青混凝土鋪裝層僅作為構造層來考慮,一般不作專門的計算分析,并且對于超載、車速和阻尼等因素對瀝青混凝土鋪裝層影響的分析也有限。本文依托雷西高速公路上的一座連續(xù)剛構橋,對該橋瀝青混凝凝土鋪裝層進行線性和非線性有限元受力分析。 首先對瀝青混凝土鋪裝層的病害類型進行歸納總結并闡述了病害的成因。第二,利用Midas有限元軟件建立全橋模型,計算全橋最不利截面的內力值,從而確定橋面鋪裝層的最不利位置。第三,利用Abaqus有限元軟件建立最不利位置處瀝青混凝土鋪裝層的局部模型,逐一研究瀝青混凝土鋪裝層在超載、不同車速和瀝青混凝土阻尼、不同水平荷載、移動荷載和孔洞積水結冰等因素影響下的力學性能。 為更真實模擬行車荷載對瀝青混凝土鋪裝層的影響,本文分別采用移動荷載加載和單次動態(tài)加載兩種模式,研究發(fā)現瀝青混凝土鋪裝層在移動荷載作用下應力的變化規(guī)律與采用單次動態(tài)加載分析相差不大；另外本文還從混凝土彈性模量、水泥品種和加載齡期等方面探討了主梁混凝土收縮徐變對瀝青混凝土鋪裝層受力性能的影響；此外,本文還分析了瀝青混凝土鋪裝層內孔洞的位置、大小和形狀等因素對瀝青混凝土鋪裝層的影響,結果表明,瀝青混凝土鋪裝層內孔洞積水結冰會對其產生極為不利的影響。 以上述研究結果為基礎,針對瀝青混凝土鋪裝層的施工工藝,從溫度控制、瀝青混凝土的碾壓和層間粘結等方面提出了相應的措施。同時,為進一步確保瀝青混凝土鋪裝層施工質量,本文建議在連續(xù)剛構橋瀝青混凝土鋪裝層施工過程中采用施工質量動態(tài)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.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U443.33

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