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针对由斜向交叉预应力混凝土路面板、砂砾分离滑动层、半刚性基层组成的路面层状体系阶跃型温度场、温度应力,预应力筋对温度应力的抵抗作用等问题进行研究。首先,建立分离式预应力路面阶跃型温度场热传导方程,并按热阻等效原理求解该温度场;然后,利用自由板理论得出预应力混凝土路面板的温度应力及预应力筋分担的温度应力,并利用MAPLE程序进行实例分析。结果表明:1 cm厚砂砾层接触热阻相当于29 cm厚混凝土路面热阻,砂砾滑动层能够有效释放路面板温度应力,斜向交叉预应力筋能够有效抵抗路面板温度应力。
Aiming at the problems such as the step-type temperature field, the temperature stress and the resistance of the prestressing tendons to the temperature stress of the pavement lamellar system consisting of inclined cross-prestressed concrete pavement slab, gravel separating sliding layer and semi-rigid basement, etc. First of all, a step-type temperature field heat conduction equation of separate prestressed pavement is established, and the temperature field is solved according to the principle of thermal resistance equivalence. Then, the temperature stress of prestressed concrete pavement slab and the share of prestressing tendons Temperature stress, and use MAPLE program for example analysis. The results show that the thermal contact resistance of 1 cm thick gravel layer is equivalent to the thermal resistance of 29 cm thick concrete pavement, the gravel sliding layer can effectively release the temperature stress of pavement slab, and obliquely crossing prestressed steel bar can effectively resist the temperature stress of road pavement.