摘要：
滑动层摩擦因数对斜向预应力水泥路面板结构受力及变形的影响较大,设置满足路面结构受力及变形要求的滑动层,是决定斜向预应力水泥路面铺设成功与否的关键因素之一,建立斜向预应力路面结构1/4有限元模型,基于此模型分析了斜向预应力水泥路面板在车轮荷载和温度梯度荷载作用下,滑动层摩擦因数对其路面结构受力与变形的影响;运用解析计算法,研究了滑动层摩擦因数对路面板内温度伸缩应力的影响,以及温度应力作用下滑动层摩擦因数对路面板伸缩量的影响;并进行了斜向预应力路面板屈曲验算.研究结果表明:车轮荷载作用下,斜向预应力路面滑动层摩擦因数对路面板内应力及变形影响较小,可忽略不计;温度梯度荷载作用下,斜向预应力路面滑动层摩擦因数在0.3～1.2范围内变化时,路面板内最大主应力均小于水泥混凝土抗弯拉强度5 MPa,不会引起斜向预应力路面板开裂;温度荷载作用下,滑动层摩擦因数小于1.04时,路面板内伸缩应力不会引起路面板开裂,且滑动层铺设初期摩擦因数越小越有利于减小路面板内温度应力值;增大滑动层后期摩擦因数,有利于减小斜向预应力路面板端伸缩量,但不应大于1.04;斜向预应力路面板最不利屈曲临界温度为48.166°C,在通常外界环境温度下,斜向预应力水泥路面板不会发生屈曲失稳破坏.%Coefficient of friction (COF) of sliding layer has significant effects on stress and deformation of panel of cross-prestressed concrete pavement (CPCP).Setting a reasonable sliding layer which can meet the requirements of CPCP structure is a key factor for sustainability of CPCP.In this paper,a 1/4 finite element model of CPCP was built to analyze the influence of COF of sliding layer on CPCP structure stress and deformation under wheel load and temperature gradient load.The influence of COF of sliding layer on the expansion stress and expansion amount of the CPCP were studied based on analytic calculation method.The buckling failure of CPCP was also checked.The results show that COF of CPCP sliding layer has negligible effects on stress and deformation in CPCP structure under wheel load.Under temperature gradient load,when COF of sliding layer varies from 0.3 to 1.2,the maximum principal stress in panel of CPCP is less than the flexural stress of cement concrete (i.e.5 MPa),which can not generate cracking in panel of CPCP.At the same time,the stress and deformation made by thermal load will not generate cracking in panel of CPCP when COF of sliding layer is under 1.04.The smaller the short-term COF of sliding layer is,the smaller temperature stress will hare in panel of CPCP.Meanwhile,the higher the long-term COF of sliding layer is,the smaller expansion the CPCP panels will have.In the end,the critical temperature of buckling failure of CPCP panel is 48.166 °C.Therefore,panel of CPCP can not appear any buckling failures under normal environmental temperature difference.13 figs,24 refs.
