發(fā)布時(shí)間：2018-07-17 21:28

【摘要】：橋梁結(jié)構(gòu)以其美觀、快捷等特點(diǎn)在現(xiàn)代公路交通建設(shè)中備受青睞。瀝青混凝土橋面鋪裝結(jié)構(gòu)作為橋梁上部結(jié)構(gòu)的重要組成部分,不僅起著傳遞分散車輛荷載的作用與此同時(shí)作為保護(hù)層避免水等有害物質(zhì)對(duì)下層結(jié)構(gòu)的侵蝕。近年來(lái)超載現(xiàn)象日趨嚴(yán)重,加上頻繁出現(xiàn)的特殊天氣條件對(duì)瀝青混凝土橋面鋪裝結(jié)構(gòu)造成了很嚴(yán)重的破壞,嚴(yán)重影響了行車安全與舒適性以及威脅到橋梁的使用壽命。因此研究水泥混凝土橋?yàn)r青混凝土鋪裝結(jié)構(gòu)力學(xué)特性,確定影響其性能的主要力學(xué)指標(biāo),在此基礎(chǔ)上有針對(duì)性的選擇鋪裝材料具有明顯的現(xiàn)實(shí)意義。本文通過使用Ansys有限元軟件,主要作了以下分析計(jì)算:(1)選擇具有代表性的半剛性瀝青路面結(jié)構(gòu),就不同層間接觸狀態(tài)下的彎沉、最大主應(yīng)力、最大剪應(yīng)力以及軸載變化對(duì)各力學(xué)指標(biāo)的影響規(guī)律展開研究。(2)在現(xiàn)有瀝青混凝土鋪裝結(jié)構(gòu)調(diào)查統(tǒng)計(jì)基礎(chǔ)上,結(jié)合相關(guān)文獻(xiàn)建立橋面鋪裝結(jié)構(gòu)的簡(jiǎn)化模型;首先研究接觸模型和連續(xù)模型的瀝青混凝土層最大主應(yīng)力、最大剪應(yīng)力,防水層界面最大剪應(yīng)力以及不同溫差條件下鋪裝結(jié)構(gòu)內(nèi)部溫度場(chǎng)與溫度應(yīng)力的分布規(guī)律;其次研究軸載以及水平力,瀝青混凝土鋪裝結(jié)構(gòu)參數(shù)、防水層參數(shù)、水泥調(diào)平層參數(shù)變化對(duì)上述主要力學(xué)指標(biāo)的影響情況。(3)分析對(duì)比半剛性瀝青路面結(jié)構(gòu)與瀝青混凝土橋面鋪裝結(jié)構(gòu)主要力學(xué)指標(biāo);在此基礎(chǔ)上選擇聚丙烯抗裂纖維和PRCR兩種瀝青混凝土添加劑,進(jìn)行了瀝青混凝土的耐水性、耐高低溫以及層間性能的試驗(yàn)驗(yàn)證。在上述計(jì)算分析以及路用性能試驗(yàn)驗(yàn)證基礎(chǔ)上,研究認(rèn)為:采用接近連續(xù)模型結(jié)構(gòu)的瀝青路面和瀝青混凝土橋面鋪裝綜合性能會(huì)有明顯改善;以抗剪性能和溫度應(yīng)力作為瀝青混凝土橋面鋪裝主控制指標(biāo);PRCR和聚丙烯抗裂纖維對(duì)瀝青混凝土的改善效果要高于普通的改性瀝青混凝土,PRCR改善效果明顯優(yōu)于聚丙烯抗裂纖維。
[Abstract]:Bridge structure is favored in modern highway traffic construction for its beautiful and quick features. As an important part of the bridge superstructure, asphalt concrete deck pavement not only acts as the transmission of dispersed vehicle load, but also acts as a protective layer to avoid the erosion of the substructure caused by harmful substances such as water. In recent years, the phenomenon of overloading is becoming more and more serious, and the special weather conditions frequently appear have caused very serious damage to the asphalt concrete bridge deck pavement structure, which has seriously affected the driving safety and comfort and threatened the service life of the bridge. Therefore, it is of great practical significance to study the mechanical properties of asphalt concrete pavement structure of cement concrete bridge and determine the main mechanical indexes that affect its performance. By using Ansys finite element software, this paper mainly makes the following analysis and calculation: (1) selecting the representative semi-rigid asphalt pavement structure, according to the deflection and maximum principal stress of different interlayer contact state, The effects of maximum shear stress and axial load on the mechanical properties are studied. (2) on the basis of investigation and statistics of existing asphalt concrete pavement structure, a simplified model of bridge deck pavement structure is established based on relevant literature. Firstly, the maximum principal stress, maximum shear stress at the interface of waterproof layer and the distribution law of temperature field and temperature stress in pavement structure under different temperature difference conditions are studied in the contact model and continuous model. Secondly, the axial load and horizontal force, the parameters of asphalt concrete pavement structure and waterproof layer are studied. The influence of cement leveling layer parameters on the above main mechanical indexes. (3) analyzing and comparing the main mechanical indexes between semi-rigid asphalt pavement structure and asphalt concrete bridge deck pavement structure; On this basis, two kinds of asphalt concrete additives, polypropylene anti-cracking fiber and PRCR, were selected to test the water resistance, high and low temperature resistance and interlayer performance of asphalt concrete. On the basis of the above calculation analysis and road performance test, it is concluded that the comprehensive performance of asphalt pavement and asphalt concrete bridge deck pavement with close to continuous model structure will be improved obviously; The improvement effect of PRCR and polypropylene fiber on asphalt concrete is better than that of conventional modified asphalt concrete and polypropylene fiber.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U443.33

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本文編號(hào)：2130991