徐变对水泥路面板湿度翘曲及应力影响研究

发布时间：2018-05-09 06:30

本文选题：水泥混凝土路面 + 弯曲徐变　；参考：《工程力学》2017年10期

【摘要】：水泥混凝土路面板的温湿度翘曲和交通荷载的耦合作用是其发生疲劳破坏的主要原因之一。湿度梯度及湿度翘曲在路面板中的存在时间较为持续长久,不可避免地会受到混凝土徐变的影响。该文进行了干燥和密闭状态下水泥混凝土梁的弯曲徐变试验,提出弯曲徐变度和徐变系数的计算方法,并将上述徐变参数植入有限元程序中模拟分析徐变对结合式和分离式混凝土路面板翘曲变形和应力发展影响。结果表明:干燥状态下的弯曲徐变是密闭状态下徐变的1.67倍;徐变能够降低翘曲变形、翘曲应力及与荷载耦合情况下的总应力;徐变对结合式路面板的翘曲变形和应力发展影响较大,徐变降低了36%的湿度翘曲变形和45%的翘曲应力;在板角交通荷载的耦合作用下,徐变可使结合式路面板的总应力降低34%。因此徐变是合理分析混凝土路面板的翘曲变形和应力发展不可忽略的因素。
[Abstract]:The coupling of temperature and humidity warpage and traffic load is one of the main reasons for fatigue failure of cement concrete pavement. Humidity gradient and moisture warping in the pavement slab exist for a long time and will inevitably be affected by concrete creep. In this paper, the bending creep tests of cement concrete beams under dry and airtight conditions are carried out, and the calculation method of bending creep degree and creep coefficient is presented. The above creep parameters are implanted into the finite element program to simulate and analyze the effect of creep on the warpage deformation and stress development of combined and separated concrete pavement panels. The results show that the bending creep in the dry state is 1.67 times higher than that in the closed state, and the creep can reduce the warpage deformation, the warpage stress and the total stress when coupled with the load. Creep has a great influence on the warpage deformation and stress development of the combined road slab, and the creep reduces the moisture warping deformation by 36% and the warpage stress by 45%, and under the coupling of the traffic load at the angle of the plate, the creep can reduce the total stress of the combined road slab by 34%. Therefore, creep is a factor that can not be ignored in analyzing the warpage deformation and stress development of concrete pavement slab.
【作者单位】：清华大学土木工程系;
【基金】：国家自然科学基金项目(51578316)
【分类号】：U416.216

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