【作者】 杨涛；

【导师】 艾长发；

【作者基本信息】 西南交通大学 ， 道路与铁道工程， 2013， 硕士

【摘要】 改性沥青桥梁伸缩缝是近些年发展起来的一种新兴桥梁伸缩装置,逐步在我国桥梁建设中得到应用。本文以成都至仁寿高速公路新建桥梁长联无缝桥面关键技术研究课题为依托,通过桥梁伸缩装置病害调查,分析病害原因,得出了伸缩装置损坏的主要影响因素。试验测试了改性沥青混凝土路用性能和伸缩性能,同时利用ABAQUS有限元软件建立伸缩缝结构模型,获得了接触面上的力学响应规律,并对桥梁伸缩缝的施工工艺、应用效果和效益等进行了分析。(1)通过原材料的性能测试,确定了伸缩缝装置原材料应选用粘稠度大、耐高温性能好、弹塑性能强的改性沥青胶结料和粒径9.5mm～16mm的玄武岩粗集料。(2)根据有关资料推荐意见,改性沥青混合料采用的油石比为1：3,通过试验测试了改性沥青混合料强度特性、高温稳定性、水稳定性、渗水性、低温抗裂性、抗疲劳性等路用性能指标；并测定了混合料的性能恢复特性、直接拉伸性能、与水泥混凝土粘结性能等指标,测试结果表明该改性沥青混合料拥有较好适应伸缩变形的能力、恢复性能、自身抗拉性能以及与水泥混凝土的粘结性能；在保证良好伸缩性能的情况下,同时保证了良好的路用性能。(3)提出了粘结面粗糙处治可以提高改性沥青混合料与梁端水泥混凝土的粘结强度,在0℃以下时,提高率大于20%：在10℃～40℃区间时,提高率在10%～20%之间；在50℃以上,提高率小于10%,低温下效果更为明显。(4)通过桥梁伸缩装置模型计算得出了结构内部应力、位移的分布规律,计算结果表明结构接触面容易造成拉压破坏和剪切破坏,并对结构模型进行了接触面粗糙化及预埋钢筋的优化,在一定程度上降低接触面发生破坏的可能。(5)贝克曼梁回弹弯沉测试结果表明改性沥青桥梁伸缩缝处路面能够满足承载能力的要求,分析表明其具有良好的社会效益与可观的经济效益。更多还原

【Abstract】 The modified bitumen bridge expansion joint is a new kind of bridge expansion devices which has been applied and developed in bridge construction in china. After surveying the disease form of bridge expansion devices, and analyzing the cause of diseases, the main factors of bridge expansion devices damage are concluded which are based on the research of the technology of the new long seamless bridge deck which is widely used in Chengdu to Renshou expressway. The pavement performance and expansion performance of modified asphalt concrete are obtained through test. This paper studies the law of mechanical response on the interface by building the model of expansion joint structure under the environment of finite element software of ABAQUS. Construction technology, application effect and advancement of the bridge expansion joint are analyzed also.(1) For the performance test of raw material, a modified asphalt cement material is selected with high viscosity, high temperature performance and strong elastic-plastic performance,and the range of basalt size is from9.5mm to16mm.(2) According to the relevant documents, they propose that the asphalt-aggregate ratio is1:3. The performance index of it is tested that of strength characteristics, high temperature stability, water stability, water permeability, low temperature crack resistance and fatigue resistance of the modified asphalt mixture. The results indicate that this modified asphalt mixture has a good performance to adapt the stretching deformation, recovery performance, tensile properties, and bonding properties with cement concrete.(3) Making the bond interface roughly could improve the bond strength between the asphalt mixture and the end of the beam concrete. The results show that if the temperature is below0℃, the enhancement rate is more than20%, and if between10℃to40℃, that is between10%to20%,while above50℃, that is lower than10%. The effect is significant at low temperature.(4) Based on the internal stress and displacement distribution of the structure, a conclusion is obtained that the interface of the structure is likely to cause tension and compression damage and shear failure. Making the interface more roughly and embedding some steel may reduce the interface damage to a certain extent.(5) The test of deflection by baker-man beam shows that the pavement with modified bitumen bridge expansion joint can meet the requirement of the carrying capacity. At the same time, it has a good social benefit and considerable economic benefit.更多还原