考虑初始裂缝的GFRP筋混凝土梁受弯性能试验  

Experimental Study on Flexural Behavior of Concrete Beams Embedded with GFRP Bar with Initial Crack

作　　者：代力[1] 何雄君[1] 杨文瑞[1] 沈锋 

机构地区：[1]武汉理工大学交通学院,武汉430063 [2]南京锋晖复合材料有限公司,南京210010

出　　处：《武汉理工大学学报》2014年第9期85-89,共5页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(51178361)

摘　　要：基于12根带初始裂纹的GFRP筋混凝土梁进行了弯曲性能试验研究,在考虑初始裂缝和混凝土标号等因素的情况下,对试件受弯承载力、破坏模式及裂缝扩展过程进行研究和分析。结果表明:初始裂缝的存在对GFRP筋混凝土梁的破坏形式没有明显影响;随着荷载的增加,考虑初始裂缝和不考虑初始裂缝的GFRP筋混凝土梁均由于受压区混凝土压碎而破坏;相同混凝土标号情况下,带初始裂缝试件跨中挠度与无初始裂缝试件的相比略大;混凝土标号对带初始裂缝GFRP筋混凝土梁的刚度有所影响,随着混凝土标号的提高,初始裂缝对试件所造成的承载能力降低的趋势有所减缓。Considering the factors such as the initial cracks and concrete grade, the bearing capacity, failure mode and crack propagation of 12 GFRP strengthened concrete beams with initial cracks were investigated through four-point ben- ding test. The experimental results reveal that the initial crack has no obvious influence on the failure mode of GFRP rein- forced concrete beam. Regardless of initial crack, for crush of compression zone concrete, the strengthened concrete beams appear damage with the increase of load. On the same concrete strength grade, regardless of the initial cracks, the mid-span deflection of GFRP reinforced concrete beam with initial cracks is slightly larger than that of GFRP concrete beam. Concrete grade has effect on stiffness of GFRP reinforced concrete beam with initial cracks. With the increase of concrete grade, the down-trend of bearing capacity caused by initial cracks slows down.

关 键 词：混凝土梁 GFRP筋 初始裂缝 承载能力 

分 类 号：TU377.9[建筑科学—结构工程]