基于组合结构的钢桥面浇注式沥青铺装材料疲劳损伤研究

发布时间：2018-06-01 17:50

  本文选题：钢桥面铺装 + 组合结构　； 参考：《重庆交通大学》2015年硕士论文

【摘要】：随着我国公路的高速发展,大跨径钢桥在公路运输中起着越来越重要的作用,而正交异性钢桥面板有着质量轻,施工期短,结构性能优良等特点,受到越来越多大跨径钢桥设计者的青睐。浇注式沥青混凝土因其优良的抗老化性、抗疲劳性、防水性以及追随正交异性钢桥面板变形的能力,使其经常被使用于正交钢桥面铺装,在欧洲以及日本的大跨径钢桥面铺装中也有着极其广泛的应用。经过十余年的研究与实践证明,钢桥面沥青铺装层的病害不仅仅是沥青混合料的材料性能问题,因为不论材料性能如何优良,毕竟有其局限性,而铺装的支撑面刚性不足或不均匀却能严重地抵消材料在性能上的提升。因此,研究浇注式沥青混凝土的疲劳性能应该把它与钢桥面板结合起来研究。本文通过对德国和日本评定浇注式沥青路用性能的方法进行了分析,并结合我国气候情况及浇注式沥青混合料应用情况,认为日本用车辙动稳定度来衡量浇注式沥青混合料热稳定性的方法缺乏控制性,因此认为采用贯入度以及贯入度增量的试验方法作为热稳定性的控制指标更加符合我国的情况,并根据不同气候分区分别提出技术要求,同时以流动性指标反映浇注式沥青混合料的和易性,要求240℃时不宜大于60s。在研究浇注式沥青混凝土的疲劳损伤时,主要根据正交异性钢桥面铺装结构受力的特性,对比分析了国内外疲劳试验模型的加载方式和破坏特点;以研究铺装材料的疲劳性能为目的,选取东南大学三点加载疲劳实验模型,建立了与实桥受力特点一致的钢桥面铺装组合结构体(由正交异性板和浇注式沥青混凝土组成)测试模型。该模型可以表征实桥正交异性钢桥面体系的结构特性,反应钢桥面铺装的真实形变特性,并可以对铺装体系的疲劳特性进行统一、快速、有效的评估。而后运用Chaboche和Lemaitre提出了疲劳损伤演化模型,从力学近似法的角度出发推导出单一沥青矩形截面梁的疲劳寿命模型。再运用抗弯刚度等效的原理简化复合结构体为单一矩形截面梁,将钢板转化为沥青铺装层叠加至矩形截面梁上,从而推导出复合结构的疲劳寿命模型。最后在实验室成型由组合结构体测试模型,采用UTM-100伺服液压沥青混合料动态疲劳试验系统进行疲劳实验,并收集相应数据,对实验数据进行分析和整理后用于对组合结构疲劳寿命的理论模型中的参数进行拟合求解,最后完善复合结构的疲劳寿命模型。
[Abstract]:With the rapid development of highway in our country, long span steel bridge plays a more and more important role in highway transportation, and orthotropic steel bridge face plate has the characteristics of light weight, short construction period, excellent structure performance, etc. It is favored by more and more designers of long span steel bridges. Due to its excellent aging resistance, fatigue resistance, waterproofing and the ability to follow the deformation of orthotropic steel bridge panels, cast asphalt concrete is often used in orthotropic steel deck pavement. It is also widely used in long span steel deck pavement in Europe and Japan. After more than ten years of research and practice, it has been proved that the disease of asphalt pavement on steel bridge deck is not only the problem of material performance of asphalt mixture, because no matter how good the material performance is, after all, it has its limitations. However, the rigidity of the supporting surface of the pavement is insufficient or uneven, but it can seriously counteract the improvement of the properties of the material. Therefore, the fatigue performance of cast asphalt concrete should be combined with steel bridge slab. In this paper, the methods of evaluating the performance of pouring asphalt in Germany and Japan are analyzed, and the climate of our country and the application of pouring asphalt mixture are analyzed. It is considered that the method of measuring the thermal stability of pouring asphalt mixture by rutting stability in Japan is lack of controllability. Therefore, it is considered that the test method of penetration and penetration increment as the control index of thermal stability is more suitable for the situation of our country. According to different climate zones, the technical requirements are put forward, and the flowability index is used to reflect the portability of pouring asphalt mixture, which should not be greater than 60 s at 240 鈩，

本文编号：1965104