基于加速加载试验的钢桥面铺装性能研究  

Study on Steel Deck Pavement Performance Based on Accelerated Loading Test

作　　者：钟科[1] 陈飞[1] 魏小皓 刘鎏[3] 

机构地区：[1]交通运输部公路科学研究院,北京100088 [2]东南大学交通学院,江苏南京210096 [3]江苏海事职业技术学院,江苏南京211100

出　　处：《公路交通科技》2017年第11期50-56,共7页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51408280;51408125);中国博士后科学基金项目(2017M610846)

摘　　要：为了对ERS钢桥面铺装体系的实际使用效果进行验证,本研究以嘉绍大桥项目为依托,采用路面加速加载系统对钢桥面铺装层的长期使用性能以及极端条件下的路用性能进行试验研究。试验发现,ERS和ERN两种结构轴载作用次数达205万次时,平均车辙深度增长的绝对值均不超过5 mm;试验加载次数超过130万次以后,两种桥面铺装结构基本不渗水,其抗滑性能也趋于稳定;加载次数超过80万次以后,铺装结构内部材料出现了疲劳损伤,弯拉应变出现明显增长,且横向最大拉应力大于纵向最大拉应力。而在高温湿热极端条件下,ERN结构在轴载作用次数达6万次时,超薄磨耗层开始出现推移剥落;ERS结构在轴载作用次数超过9万次后,SMA结构层迅速破坏。结果表明,ERS和ERN两种结构在自然条件下均未出现开裂或破损,具有优良的抗车辙性能;而在极端条件下,这两种结构都出现明显的滑移剪切破坏。相反,热固性的树脂沥青材料在极端条件下表现出了极佳的高温稳定性能,但其抗开裂性能有待进一步研究。横向拉应力引起的纵向裂缝是造成铺装层开裂破坏的主要原因,因此应将横向最大拉应力作为铺装层设计的重要控制指标。In order to verify the practical service effect of ERS steel deck pavement system, based on the project of Jiaxing - Shaoxing Bridge, the long-term performance of steel bridge deck pavement and the pavement performance under extreme conditions are experimentally studied by using pavement accelerated loading system. The test result shows that （ 1 ） the absolute values of the average rut depth growth of ERS and ERN are less than 5 mm when the number of axle loads is 2.05 million times ; （2） after more than 1.3 million loading times, the 2 deck pavement structures are almost impermeable to water and their anti-skid properties also tend to be stable ; （3） after more than 0. 8 million loading times, the fatigue damage occurred in the pavement structure, the flexural tensile strain increased obviously, and the maximum tensile stress in transverse direction is greater than that in longitudinal direction; （4） under the extreme heat and humid condition, when the ERN structure is in the axle loading up to 60 000 times, the ultrathin wear layer began to appear to exfoliation ; （5） the SMA layer of ERS structure is rapidly destroyed after more than 90 000 times of axial loading. The result shows that （ 1 ） both ERS and ERN structures are not cracked or damaged under natural conditions and have excellent anti-rutting performance; （2） both structures have obvious slippage and shear failure under the extreme conditions; （3） on the contrary, the thermosetting resin asphalt materials show excellent high temperature stability under extreme conditions, but its anti-cracking performance remains to be further studied; （4） the longitudinal crack caused by transverse tensile stress is the main cause of pavement cracking, therefore, the maximum transverse tensile stress should be taken as an important control index of pavement design.

关 键 词：桥梁工程 钢桥面铺装 加速加载试验 ERS ERN 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]