界面优化下的GFRP-混凝土组合桥面板静力性能试验研究

为推广GFRP-混凝土组合桥面板的工程应用,在GFRP-混凝土组合板界面抗剪试验研究的基础上,选取黏砂连接和环氧树脂湿黏结2种连接界面,将前期研究的GFRP-混凝土组合桥面板的连接界面进行重新优化设计,制作10块试件进行静力试验,并将试验结果与前期研究结果进行对比分析.研究结果表明:界面重新优化设计的组合板试件,在试验加载过程中能够满足平截面假定,具有良好的整体工作性能,具有较高的承载力和良好的变形恢复能力;试件的破坏虽然为脆性破坏,但是在破坏前构件的变形较大,有一定预兆,具有较高的强度安全储备.

Static Experimental Study on Performance of GFRP-concrete Composite Bridge Deck with an Optimized Interface

Reliable interface connections of composite decks are important for their structural performance. To promote engineering applications of GFRP-concrete bridge decks, both the distributed sand bonding interface and the wet epoxy resin bonding interface are considered in the present study. Previous GRFP-concrete interface details are also optimized based on the double-shear test results of the GFRP-concrete composite bridge deck. Ten specimens are manufactured and tested under static loading, and the test results are compared with the previous test results. The present study shows that, with the optimized GFRP-concrete interface, the deformation of the specimens agrees with the plane deformation assumption during the loading process. The specimens show good integrity and high load-carrying capacity as well as good capability in recovering their deformations. Although brittle failure modes are observed in the specimens, large deflections occur before failure, which give some failure warning and ensure relatively high reservation of strength safety.