带工作裂缝GFRP筋混凝土梁抗弯性能受环境影响试验研究  

Experimental Study on the Environmental Effect of Bending Performance of GFRP Reinforced Concrete Beams with Work Cracks

作　　者：代力[1] 何雄君[1] 杨文瑞[1] 王江[1] 

机构地区：[1]武汉理工大学交通学院,武汉430063

出　　处：《武汉理工大学学报（交通科学与工程版）》2015年第4期755-758,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金项目资助(批准号:51178361)

摘　　要：通过24根带工作裂缝玻璃纤维增强材料(glass fiber reinforced polymer,GFRP)筋混凝土梁的抗弯性能试验,研究了不同加速老化环境下对其抗弯性能的影响,得到了带工作裂缝GFRP筋混凝土梁在不同环境下的破坏形态、截面应变、荷载-挠度曲线.试验研究表明,不同工况下带工作裂缝GFRP筋混凝土梁受力变形直至破坏过程中,跨中截面实测应变分布基本符合平截面假定;不同环境下带工作裂缝GFRP筋混凝土梁的抗弯性能相差较大;处于水溶液、碱性溶液环境下预裂试件的抗弯承载力与室外环境下预裂试件的抗弯承载力相比分别降低了13.7%和35.3%;而对于非预裂试件而言,处于同样环境下浸泡的试件抗弯承载力与室外环境下相比分别降低了11.5%、7.7%;工作裂缝的存在使得试件的抗弯能力在室外环境、水溶液、碱性溶液中分别下降了10.90%、13.04%、37.50%.An experimental study on 24 GFRP （glass fiber reinforced polymer） reinforced concrete beams with work cracks under different kinds of accelerated aging environments was conducted to in- vestigate their flexural capacity, failure mode, concrete cross-section strain distribution, load-deflec- tion curves. The results show that the measured strain distribution on the cross sections of GFRP re- inforced concrete beams for various conditions obeys the plain section assumption from the process of loading to failure and the flexural capacity of GFRP reinforced concrete beams with work cracks under all kinds of accelerated aging environment is different. For the pre-cracked specimens, the effect of environments under water and alkaline solution demonstrated about 13.7%, 35.3% bending capacity decrease respectively on basis of those of the outdoor. For the non-precracked specimens, the bending capacity of specimen under water and alkaline solution is lower than that of the outdoor environment, reduced by 11. 5% and 7. 7% respectively. The existence of cracks makes the bending capacity of specimen under outdoor environment, water solution and alkaline solution decrease by 10. 90%, 13.04%, 37.50% respectively.

关 键 词：混凝土梁 GFRP筋 预裂 加速老化环境 抗弯承载力 

分 类 号：TU377.9[建筑科学—结构工程]