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

连续沥青层增强聚合物网格预制公路桥梁伸缩缝搭设方法的研制

• 批准号: 06650515
• 负责人: SUGIYAMA Toshiyuki
• 金额: $ 1.22万
• 依托单位: YAMANASHI UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06650515/
• 关键词: highway bridge; expansion joint; jointless bridge; asphalt layr reinfored by polymer grid; 合成樹脂グリッド

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.

为了探讨聚合物网格增强连续沥青层预制式公路伸缩缝的压缩和屈曲性能，进行了试验。实验结果表明，聚合物网格的合理布置方式是在底层放置一个聚合物网格，在沥青上层放置另一个聚合物网格，这样可以防止聚合物网格与沥青分离。还对屈曲的解析值与实验值进行了比较。结果表明,实验值在分析值的50%~90%之间。还讨论了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式。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分设置该连接块的方法。结果表明，如果将两块聚合物网格边缘突出约1cm的复合沥青块连接起来，则连接块的抗拉强度与一块沥青块的抗拉强度大致相同。从实验结果和有限元分析也确认，合成树脂胶应粘贴在靠近沥青块两侧边缘的小区域内。到本项目期结束时，尚未完成能够适当模拟沥青块开裂后塑性行为的计算机程序。钢筋混凝土工程领域正在开发的旋转裂缝模型的结合可以被认为是模拟上述行为的有用尝试。