基于设置参数的传力杆力学特征计算与分析

Mechanical Characteristics Calculation and Analysis of Dowel Bar Based on Design Parameters

建立了Winkler地基上考虑层间接触状况的双层路面结构模型,计算了传力杆几何尺寸、空间位置、与混凝土结合状况及布设方式对采用乳化沥青进行层间处治的水泥混凝土路面接缝传荷能力、传力杆内力和面层最大应力的影响。结果表明:增加传力杆长度、直径不能有效提高接缝传荷能力,但能降低面层最大应力;弯沉传荷系数随传力杆竖直偏角的增大线性减小,随传力杆支撑模量的增大呈指数增大,随松动量的增大呈二次曲线下降;弯沉传荷系数随传力杆数量的增加而提高;数量相同时,层数和位置差异对传荷能力影响不大,均匀布设改为轮迹带布置时传荷能力略有降低;达到一定数量后接缝传荷能力几乎不再因布设位置、层数发生变化。

Based on double-layer pavement structure model which considering interlayer contact situation, the effect of geometrical dimension, three-dimensional position, condition of combining with concrete as well as setting mode of dowel bar to joint load-transfer capacity, internal stress of dowel bar and maximum stress of slab in cement concrete pavement with interlayer treated by emulsified asphalt are analyzed. The results show that increasing the diameter and length of dowel bar cannot effectively enhance the capacity of load-transfer, but can reduce maximum stress of slab; load transfer coefficient decreases linearly with increasing of dowel bar vertical angle, exponential grows with the increase of dowel bar supporting modulus, and conical decreases with increase of dowel bar looseness; when an equal number of dowel bar laid on the wheel track belt or laid evenly along the transverse joint, transfer capacity is approximately the same, and transfer capacity slightly lowers when position move changing from evenly to wheel track belt, and when the quantity of dowel bar reaches to a certain amount, transfer capacity doesn＇t change significantly due to the setting position and layer.