CFRP增强工程水泥基复合材料桥面连接板的结构和性能

桥梁面板的伸缩缝连接装置是现今桥梁施工与维护的难题之一。桥面无缝连接板是将相邻的桥面板连接在桥墩上，形成桥跨间的连续板。结合碳纤维增强聚合物基复合材料（CFRP）良好的耐腐蚀性与工程水泥基复合材料（Engineered Cementitious Composites，ECC）的高延性，对CFRP材料增强ECC桥面连接板进行研究。对比了CFRP软质格栅、CFRP筋材和纯ECC桥面连接板的荷载-位移曲线、裂缝分布、应变以及变形，分析三种连接板的连接性能。试验结果表明，三种桥面连接板能满足工程变形与开裂要求。CFRP软质格栅削弱连接板材料界面，降低板多裂缝开展，对增强桥面连接板作用较小。相对其他ECC连接板构件，CFRP筋材对ECC连接板增强作用明显，其弯曲变形能力显著提高，裂缝均匀且分布广泛，整体工作性能良好。 

Structural performance of CFRP reinforced ECC link slabs in jointless bridge decks

The maintenance of the expansion joints in concrete deck slabs is one of the most serious problems in current bridge engineering. One of the alternatives is the use of link slab in a jointless bridge, which connects the adjacent bridge deck slabs at the pier, forming a continuous slab across the bridge spans. Based on the good corrosion resistance of carbon fiber reinforced polymer (CFRP) and high ductility of engineered cementitious composites(ECC), the CFRP reinforced ECC link slabs were proposed in this study and the behaviour of this novel link slab were investigated through a series of experimental test. The load-displacement response, crack distribution, strain, and deformation of CFRP soft grid, CFRP bar and ECC link slabs were compared to investigate the behaviour of the test link slabs. The experimental results show that all the ECC test link slabs can satisfy the requirements of deformation and cracking. It is found that using CFRP grid results in the damage in the interface of the link slab. Therefore, the multi-cracking behaviour of the ECC link slab is reduced, which has negative effect on the behaviour of ECC link slab. Compared with the other test link slabs, CFRP bars has a significant effect on the ECC link slab. The deformation capacity is significantly enhanced. The cracks are evenly distributed with small crack width. As a result, the global structural performance of ECC link slabs is improved.