钢桥面沥青铺装界面应力应变状态试验研究

发布时间：2018-03-18 02:03

本文选题：钢桥面铺装　切入点：防水粘结层　出处：《长沙理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：调查显示,国内外钢桥面沥青铺装病害中,造成沥青层脱层、开裂、推移和拥包的原因之一是防水粘结层抗剪性能不足。无论是设计理论还是试验研究,对钢桥面铺装防水粘结层应力应变状态研究较少。为保证西樵大桥钢桥面铺装界面性能满足要求,通过叠层梁弯曲试验分析界面剪切特性,研究钢桥面沥青铺装界面应力应变状态。本文采用叠层梁弯曲试验研究钢桥面铺装界面剪切特性。由于钢桥面板和沥青铺装层模量相差较大,在界面产生较大剪应力。通过测量叠层梁侧面的线应变,得到界面层的平均剪应变。相同加载条件下,铺装层底部的线应变明显大于钢板顶部线应变;界面的平均剪应变大小位于顶面线应变和底面线应变值之间;防水粘结层材料的粘结力影响荷载的传递,粘结力好的防水粘结层利于荷载的传递;不同铺装层材料由于模量不同,使得在相同荷载作用下相同位置的界面应力不同,模量大的改性沥青SMA-13的应变比AC-13小。叠层梁弯曲试验界面剪切性能研究,得到防水粘结层剪切应力应变关系;铺装层材料和防水粘结材料的不同,将影响界面剪切应力应变函数关系中参数取值,当铺装材料为AC-13时A2取值为0。对比试验所测线应变和理论值可知,假设界面完全连续的剪应变计算值小于试验值,故现有设计方法所得设计指标偏危险。
[Abstract]:The investigation shows that one of the causes of asphalt pavement diseases at home and abroad is the insufficient shear resistance of waterproof adhesive layer, both in design theory and experimental study. In order to ensure that the interface performance of steel deck pavement of Xiqiao Bridge meets the requirements, the shear behavior of interface is analyzed by bending test of laminated beam. The stress and strain state at the interface of steel bridge deck asphalt pavement is studied. In this paper, the shear characteristics of steel bridge deck pavement interface are studied by means of laminated beam bending test. The average shear strain of the interface layer is obtained by measuring the linear strain of the side of the laminated beam. Under the same loading conditions, the linear strain at the bottom of the pavement is obviously larger than that at the top of the steel plate. The average shear strain of the interface lies between the line strain of the top plane and the line strain value of the bottom surface, and the bond force of the waterproof adhesive layer affects the load transfer, and the waterproof bond layer with good adhesive force is propitious to the transfer of the load. Because of the different modulus of different paving materials, the interfacial stress at the same position under the same load is different. The strain of modified asphalt SMA-13 with high modulus is smaller than that of AC-13. The shear stress-strain relationship of waterproof adhesive layer is obtained, and the difference between pavement material and waterproof bond material will affect the parameters of interface shear stress-strain function. When the pavement material is AC-13, the A2 value is 0. By comparing the measured linear strain with the theoretical value, it can be seen that the calculated value of shear strain with completely continuous interface is less than the test value, so the design index obtained by the existing design method is dangerous.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.33

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