复合浇注式沥青钢箱梁桥面铺装设计研究

发布时间：2018-05-08 14:57

本文选题：钢桥面铺装 + 复合浇注式沥青混合料　；参考：《东南大学》2015年硕士论文

【摘要】：钢桥面铺装是世界桥梁界普遍关注的问题,也是桥梁工程中的关键技术之一。现在大跨径桥梁绝大多数均采用了正交异性钢桥面板,这就进一步加快了钢桥面铺装的研究进程。然而,到目前为止,尚无完全适合的钢桥面铺装材料和结构设计。本文结合南京长江第四大桥的使用条件,开展对钢桥面铺装材料、铺装结构和性能的分析,对适合南京四桥悬索桥这一结构特点的铺装结构进行研究。研究发现,下层浇注式沥青混合料是一种悬浮密实型结构,结构稳定性受温度的影响比较大,在常温、低温条件下,浇注式沥青混合料的模量比较大,但在高温条件下浇注式沥青混合料模量迅速衰减。为了提高浇注式沥青层的高温性能,可以在浇注式沥青层表面压入15-20mm的预裹沥青玄武岩碎石。由于悬索桥桥面板柔度大,以及在行车荷载与温度变化、风载、地震等自然因素共同影响下,特别是悬索桥柔性桥梁结构大变形的影响下,钢桥面铺装要求更高。以高弹改性沥青材料铺筑在浇注式沥青混凝土上层,可以有效提高面层和钢桥面的结合,提升高温性能。经过试验证明,在高弹改性沥青混凝土中掺加天然特细砂,可以在保证高弹改性沥青混凝土施工和易性的基础上,增加高弹改性沥青混凝土的路用性能。铺装总厚度保持不变的情况下,适当的降低浇注式结构层厚度,增加高弹改性沥青混凝土结构层厚度,可改善整个铺装层的高温性能。通过铺装试验桥段现场数据和试验室取得的试验结果系统地分析了复合浇注式沥青混凝土对大型悬索式钢桥面铺装的性能影响。为今后类似的跨江河大桥面铺装提供了宝贵数据。
[Abstract]:Steel deck pavement is a common concern in the world, and it is also one of the key technologies in bridge engineering. At present, orthotropic steel deck is used in most long span bridges, which speeds up the research process of steel deck pavement. However, up to now, there is no perfect steel bridge deck pavement material and structure design. Based on the application conditions of the fourth Nanjing Yangtze River Bridge, this paper analyzes the pavement material, pavement structure and performance of the steel bridge deck, and studies the pavement structure suitable for the structural characteristics of the suspension bridge of the fourth Nanjing Bridge. It is found that the lower pouring asphalt mixture is a kind of suspended dense structure, and the stability of the structure is greatly affected by temperature, and the modulus of the pouring asphalt mixture is relatively large at room temperature and low temperature. However, the modulus of cast asphalt mixture decays rapidly under high temperature. In order to improve the high temperature performance of the cast asphalt layer, 15-20mm precoated bituminous basalt macadam can be pressed on the surface of the cast asphalt layer. Because of the great flexibility of the deck slab of suspension bridge, and under the influence of natural factors such as train load and temperature change, wind load, earthquake and so on, especially under the influence of large deformation of suspension bridge flexible bridge structure, the requirement of steel deck pavement is higher. The combination of surface layer and steel bridge deck can be effectively improved and the high temperature performance can be improved by laying high elastic modified asphalt material on the upper layer of cast asphalt concrete. It is proved by experiments that adding natural ultra-fine sand to high elastic modified asphalt concrete can increase the pavement performance of high elastic modified asphalt concrete on the basis of ensuring its construction and ease. Under the condition that the total thickness of pavement remains unchanged, the high temperature performance of the whole pavement can be improved by decreasing the thickness of pouring structure layer and increasing the thickness of high elastic modified asphalt concrete structure layer. The influence of composite pouring asphalt concrete on the performance of large suspension steel bridge deck pavement is systematically analyzed by the field data of the pavement test section and the test results obtained from the laboratory. It provides valuable data for the similar pavement of bridge deck across the river in the future.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.33

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