Development of Setting Up Method of Prefabricated Highway Bridge Expansion Joint with Continuous Asphalt Layr Reinforced Polymer Grid

为探讨聚合物格栅加筋连续沥青层装配式公路伸缩缝的抗压屈曲性能，进行了试验研究。试验结果表明，由于防止了聚合物格栅与沥青之间的分离，聚合物格栅的合理布置是在沥青底层设置一个聚合物格栅，在上层设置另一个聚合物格栅。并将屈曲解析值与实验值进行了比较。并对作为伸缩缝构件的两个预制复合沥青管片与连续沥青层的连接方法进行了探讨。并根据试验结果和有限元分析，探讨了在施工现场伸缩缝部位设置这种连接块的方法。结果表明，将聚合物格栅边长约1 cm的两个复合沥青段连接起来，其抗拉强度与一块沥青砌块的抗拉强度基本相同。从试验结果和有限元分析中还认识到，合成树脂胶应粘贴在沥青砌块两边附近的较小区域，到本项目期末，能够适当模拟沥青砌块开裂后塑性行为的计算机程序尚未编制完成。钢筋混凝土工程领域正在发展的旋转裂缝模型的引入可以被认为是模拟上述行为的一种有益的尝试。

In order to discuss the compression and buckling behavior of prefabricated highway expansion joint with continuous asphalt layr reinforced by polymer grid, the experiment has conducted. The experimental results show that the appropriate arrangement of polymer grid is to place one polymer grid in the bottom layr and to place another polymer grid in the upper layr of asphalt because of the prevention of the separation between polymer grid and asphait. The comparison of analytical values of buckling with experimental ones has been made, too. And it has been revealed that the experimental values are between 50% and 90% of analytical ones.The way to connect two prefabricated composite asphalt segments which are used as the component of exansion joint with continuous asphalt layr is also discussed. And the way to set up this connected block in the portion of expansion joint at construction site is investigated based on experimental results and Finite Element Method analysis. The result shows that if two composite asphalt segments in which polymer grid protrudes with the length of about 1cm at an edge are connected, the tensile strength of connected block is approximately the same as that of one piece of asphalt block. It has been also reconized from experimental results and Finite Element Method analysis that the synthetic resin glue should be pasted in a small area near both edges of the asphalt block.The computer program in which the plastic behavior after cracking of asphalt block is able is able to be simulated appropriately has not been completed by the end of this project term. The incorporation of rotated crack model which is under development in the field of reinforced concrete engineering may be considered to be an useful attempt to simulate the above mentioned behavior.