BFRP布加固损伤钢筋混凝土短梁的抗弯性能研究  

Experimental study on flexural behavior of damaged reinforced concrete short beams strengthened with BFRP cloth

作　　者：张军伟 王廷彦[2,3] 吴玉祥 ZHANG Junwei;WANG Tingyan;WU Yuxiang(Capital Construction Department,Henan Agricultural University,Zhengzhou 450002,China;College of Civil Engineering,Guangzhou University,Guangzhou 510006,China;School of Civil Engineering and Communication,North China University of Water Resources and Electric Power,Zhengzhou 450045,China)

机构地区：[1]河南农业大学基建处,河南郑州450002 [2]广州大学土木工程学院,广东广州510006 [3]华北水利水电大学土木与交通学院,河南郑州450045

出　　处：《混凝土与水泥制品》2023年第8期42-47,共6页China Concrete and Cement Products

基　　金：中国地震局工程力学研究所基本科研业务费专项资助项目(2020EEEVL0411);河南省自然科学青年基金项目(212300410193)。

摘　　要：通过对3根试件进行抗弯性能试验,研究了普通RC短梁、BFRP布加固未损伤及损伤钢筋混凝土短梁的破坏形态、材料应变、受弯承载力等变化规律。结果表明:BFRP布加固未损伤及损伤RC短梁的极限破坏模式一致,均为BFRP布先被拉断,受压区混凝土未被压碎;与普通RC短梁一致,加固后的试件跨中截面混凝土应变均近似符合平截面假定;BFRP布加固损伤RC短梁的荷载-挠度曲线不存在开裂阶段,且加固后,损伤RC短梁的极限承载力比未损伤RC短梁和普通RC短梁的极限承载力稍高;BFRP布加固未损伤RC短梁可提高试件刚度,降低试件延性;BFRP布加固损伤RC短梁也可提高试件刚度,但不会降低试件延性。Based on the bending performance tests of three RC short beams,the failure morphology,material strain,flexural bearing capacity,etc.of ordinary RC short beams and BFRP cloth reinforced undamaged and damaged RC short beams were studied.The results show that the ultimate failure modes of undamaged and damaged RC short beams strengthened with BFRP cloth are consistent,with BFRP cloth being pulled first and the concrete in the compression zone not being crushed.The strain of the mid span concrete of both undamaged and damaged reinforced concrete short beams strengthened with BFRP cloth is approximately consistent with the assumption of a flat section as the ordinary RC short beams.The load-deflection curve of BFRP cloth reinforced damaged RC short beams lackes cracking stage.The ultimate bearing capacity of damaged RC short beams is slightly higher than that of reinforced undamaged RC short beams and the ordinary reinforced concrete short beams.After the undamaged short beam is reinforced with BFRP cloth,the stiffness of the specimen can be increased and the ductility of the specimen can be reduced.After the damaged short beam is reinforced with BFRP cloth,its stiffness can also be increased,but the ductility can not be reduced.

关 键 词：BFRP布 钢筋混凝土短梁 损伤荷载 抗弯试验 

分 类 号：TU528.7[建筑科学—建筑技术科学]