重轴载交通下斜向预应力混凝土路面应用研究

发布时间：2018-06-19 21:23

本文选题：重轴载交通 + 斜向预应力　；参考：《大连理工大学学报》2015年03期

【摘要】：针对重轴载交通下普通水泥混凝土路面抗疲劳性能较差、容易产生裂纹的问题,提出将斜向预应力混凝土路面引入重轴载交通中,并结合已有定测下混凝土疲劳试验结果对其抗疲劳机理进行深入分析.同时,根据混凝土疲劳破坏发展的历程,提出此种路面结构中预应力筋的分步张拉方法:当混凝土浇筑完成24h后,预应力筋第一次张拉到30%的设计轴力,以控制混凝土路面初期裂纹;当混凝土达到设计龄期后,张拉至设计轴力用以抵消温度应力和部分重轴载引起的路面拉应力,保证路面结构在正常使用情况下处于三维压缩状态,从而防止混凝土裂纹的出现和扩展,达到提高混凝土第二阶段抗疲劳强度的目的.实例验证了斜向预应力混凝土路面结构适用于重轴载交通.
[Abstract]:In view of the problem that the fatigue resistance of ordinary cement concrete pavement under heavy axle traffic is poor and the cracks are easy to occur, the paper puts forward that the oblique prestressed concrete pavement should be introduced into the heavy axle load traffic. Combined with the fatigue test results of concrete, the anti-fatigue mechanism of concrete is analyzed. At the same time, according to the development course of fatigue failure of concrete, a step by step tension method of prestressed tendons in this kind of pavement structure is put forward: after 24 hours of concrete construction, the first tension of prestressed tendons reaches 30% of the design axial force. In order to control the initial crack of concrete pavement, when the concrete reaches the design age, the tension to the design axial force is used to counteract the temperature stress and the pavement tensile stress caused by partial heavy axle load. In order to prevent the concrete crack from appearing and spreading, the pavement structure is in the state of three-dimensional compression under normal use, and the purpose of improving the fatigue strength of the second stage of concrete is achieved. The example shows that the oblique prestressed concrete pavement structure is suitable for heavy axle traffic.
【作者单位】：沈阳建筑大学土木工程学院;吉林建筑大学土木工程学院;
【基金】：国家自然科学基金青年基金资助项目(51308255) 辽宁省高等学校杰出青年学者成长计划资助项目(LJQ2014059)
【分类号】：U416.216

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