Calculation of Bearing Capacity of Fiberglass Grid Reinforced Asphalt Mixture Based on Stress-Strain Relationship

Abstract

It can effectively reduce the damage of the asphalt mixture for bridge deck pavement to lay fiberglass grid in the asphalt mixture bridge deck pavement. However, there is little research on the bearing capacity of reinforced grid asphalt mixtures. Therefore, based on the material constitutive relationships and the plane section assumption, some relevant researches is conducted. Firstly, it is clear that the compression process of asphalt mixture can be divided into four stages, which are reverse bending stage, linear stage, hyperbolic stage, and failure stage. The stress-strain fitting formulas for each stage are different, and the stress on asphalt mixture bridge deck pavement is generally in the hyperbolic stage. Secondly, based on the assumption of plain section, the bearing capacity calculation formula for a double reinforced rectangular section with fiberglass grid reinforcement is derived by considering the compression and tension of the asphalt mixture separately. Finally, with specific examples, the correctness of the formula is verified. Meanwhile, in order to uniquely determine the area of fiberglass grid and steel reinforcement, we need to add an additional condition, usually with the lowest cost as the supplementary condition. Moreover, considering the stress effect of asphalt mixture and the effect of fiberglass grid reinforcement, a height of the compression zone of section is slightly reduced, and the structural bearing capacity is slightly improved.