基于加速加载试验的钢桥面铺装性能研究

发布时间：2018-01-12 13:04

本文关键词：基于加速加载试验的钢桥面铺装性能研究　出处：《公路交通科技》2017年11期 　论文类型：期刊论文

【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。
[Abstract]:In order to use the actual effect of ERS steel deck pavement system is verified, based on the project of Jiashao Bridge Based on the test of performance using the accelerated loading system of steel deck pavement of long term performance and extreme conditions. Experiments showed that ERS and ERN two kinds of structure of axle load 2 million 50 thousand, the absolute value of average growth rut depth was less than 5 mm; after loading more than 1 million 300 thousand times, two kinds of pavement structure without water seepage, the anti sliding performance tends to be stable; after loading more than 800 thousand times the number of pavement materials appeared, internal fatigue damage, the tensile strain grew significantly, and the maximum transverse tensile stress is greater than the maximum longitudinal tensile stress. In hot humid extreme conditions, the structure of ERN load on the shaft up to 60 thousand times the number, the ultra-thin layer began pushing off; ERS In the structure of axle load of more than 90 thousand times, the structure of SMA layer rapidly destroyed. The results showed that ERS and ERN two kinds of structures under natural conditions without cracking or breakage, has excellent anti rutting performance; while in extreme conditions, these two structures are evident slip shear failure instead. Resin, thermosetting asphalt materials under extreme conditions showed excellent high-temperature stability, but its anti cracking performance needs to be further studied. The longitudinal cracks caused by transverse tensile stress is the main cause of pavement cracking, so it should be the maximum transverse tensile stress as an important control parameter of pavement design.

【作者单位】：交通运输部公路科学研究院;东南大学交通学院;江苏海事职业技术学院;
【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)
【分类号】：U443.33
【正文快照】： 3.江苏海事职业技术学院,江苏南京211100)0引言钢桥面铺装发展至今已形成了双层环氧、SMA+浇注式沥青混凝土、环氧沥青混凝土+浇注式沥青混凝土等铺装结构类型[1-3],但是在实际应用中仍然存在一定的问题,如环氧铺装有开裂病害出现,浇注式沥青混凝土高温稳定性差、易车辙等。然

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