高温下复合材料桥梁防撞装置节段冲击及残余性能试验

Experiment on impact and residual compressive strength of segment of composite ship-bridge anti-collision system at high temperatures

以板式复合材料桥梁防撞装置节段为研究对象,参照相关规范,充分考虑节段泡沫芯材密度、冲击能量及环境温度的影响,采用落锤冲击试验研究防撞装置节段冲击性能及冲击后残余压缩性能的变化规律。研究结果表明:节段能量吸收能力随着环境温度升高而显著降低,表现为泡沫变脆、黏结层脱层及格构腹板断裂。在相同冲击能量下,相比30℃时,50,70和90℃下试件的能量吸收能力分别下降了8.5%,9.6%及19.4%;同时,泡沫芯材密度对冲击性能也有一定影响,芯材密度越大,试件抗冲击能力越高。冲击后残余压缩性能试验表明,高温作用下的冲击损伤更严重,刚度锐减,导致压缩能力下降,但压缩到一定程度的极限屈服荷载较接近。

The experimental on impact and residual compressive strength of segment of composite ship-bridge anti-collision system at high temperatures was conducted according to the related codes.The effects of foam core density,impact energy and environmental temperature on impact behavior and post impact residual compressive strength of segments were summarized.The results show that the impact energy loss of the specimens increases with the increase of temperatures.Compared to the specimens at 30℃,the energy absorbing ability of specimens at 50,70 and 90℃decreases by 8.5%,9.6%and 19.4%,respectively.In the meantime,the impact resistance of the specimens becomes larger when the foam core density is higher.According to the post-impact residual compressive strength,the impact damage of specimens is serious at high temperatures,and the stiffness decreases sharply.Although the residual compressive strength of damaged specimens decrease,the ultimate strength of specimens is identical.