沥青加铺层温度应力研究(Ⅰ)：力学模型

研究比较了3维有限元模型、平面有限元模型和弹性地基上双层叠合梁模型在分析旧混凝土路面上沥青加铺层温度应力的适用性,指出加铺层路面结构变形视二垂直方向变形之叠加是可行的.由于旧混凝土路面接缝造成的结构间断,加铺层层底应力集中现象明显,收敛较其截面内力(弯矩和轴向力)困难,加铺层受力状况宜用其截面内力表征.调整双层梁的水平剪切变形和竖向拉压变形效应系数,弹性地基上双层叠合梁模型的加铺层截面内力计算结果与2维平面模型的结果具有很好的一致性.

Thermal Stresses of Asphalt Overlay on Cement Concrete Pavement (Ⅰ): Mechanistic Models

The paper presents a comparative study of the applicability of solid model, plane model and bi layer beams on elastic foundation model which are employed to analyze the thermal stresses of asphalt overlay paved on cement concrete pavement slabs.Study results show that it is feasible to represent the structural deformation of asphalt overlay by means of superposition of deformations occurring in two sets of beams perpendicular to each other. Due to the discontinuity at the joints of cement concrete pavement slabs, the thermal stresses of asphalt overlay near the joints concentrate remankably,and are more difficult to converge than sectional inner forces (axial force, sectional moment).It is appropriate to describe the stress state of asphalt overlay with the sectional inner forces.By adjusting the coefficients of horizontal shear and uniaxial tension compression effects, the sectional inner forces of asphalt overlay obtained with bi layer beams model agrees well with that based upon plane model.