水泥混凝土路面板温度翘曲应力的尺寸效应研究

Study on size effect of temperature warping stress of cement concrete pavement

通过对水泥混凝土板内温度翘曲应力的三维尺寸效应规律综合研究,得出当路面板厚度一定,板内纵向拉应力值随着板长的增大而增大,当板长达到8 m之后,纵向拉应力趋于一稳定值。路面板平面尺寸一定时,板内翘曲应力则呈现当板厚小于22 cm时,随板厚增大而增大,板厚大于22 cm时,则随着板厚的增大而减小的规律。对于考虑重力作用和层间接触完全连续的水泥混凝土路面,布设传力杆或水平拉杆对路面板的温度翘曲应力约束作用很小。

Through the 3D effect comprehensive study of the temperature warping stress of cement concrete slab,when slab thickness is constant,the pavement longitu-dinal tensile stress value increases with the increase of the length of the slab,and when the length is up to 8 m,the longitudinal tensile stress tends to a stable value. When the slab size is constant,the warping stress shows that when the slab thickness is less than 22 cm,the stress increases with the thickness increase,and when the slab thickness is more than 22 cm,it decreases with the thic-kness increase. To be considered as the interlayer com-pletely continuous and the gravity influence,the restraint effect of laying out dowel bars or horizontal tie beams on temperature warping stress of pavement slabs is very small.