配筋率对高强钢筋UHPFRC梁抗剪性能的影响  

Effect of reinforcement ratio on shear behavior of high strength steel reinforced UHPFRC beam

作　　者：李莹 欧建叶 张加峰 周志文 金凌志[1] LI Ying;OU Jianye;ZHANG Jiafeng;ZHOU Zhiwen;JIN Lingzhi(College of Civil Engineering and Architecture,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004

出　　处：《混凝土》2018年第9期35-39,共5页Concrete

基　　金：国家自然基金项目(51368013);广西重点实验室项目资助(2015-A-02);国家大学生创新创业项目(201610596138)

摘　　要：为了研究HRB500级高强钢筋超高性能纤维混凝土简支梁的抗剪性能,通过改变纵向受力钢筋配筋率和剪跨比,对6根在集中荷载下的UHPFRC简支梁进行受剪破坏试验,对比分析不同剪跨比下配筋率对试验梁破坏形态、斜裂缝宽度、开裂荷载和极限荷载等的影响。研究结果表明:在试件的加载过程中,试验梁的腹剪斜裂缝发展成临界斜裂缝;纵筋率对试验梁的破坏形态有一定影响,对斜裂缝的开展有一定的抑制作用;随着纵筋率的提高,开裂荷载增大,斜裂缝宽度在相同荷载下减小,主斜裂缝的倾角减小。To study the shearing resistance of simply supported beam composed with HPB500 grade high strength steel bar and ultra-high performance fiber reinforced concrete,Six UHPFRC simply supported beams under concentrated load were tested with shear failure analysis by changing the longitudinal steel ratio and shear span ratio.Then the influence of reinforcement ratio on the failure shape,the width of diagonal crack,the cracking load and the ultimate load of the test beam under different shear span ratio are compared and analyzed.The results show that during the loading process,the critical inclined cracks of the test beam are developed from the diagonal shear cracks;The longitudinal reinforcement ratio has certain influence on the failure shape of the test beam,and has a certain inhibitory effect on the development of diagonal cracks;With the increase of the longitudinal reinforcement ratio,the cracking load increases,while the width of the inclined crack decreases under the same load,and the inclination angle of the main inclined crack decreases.

关 键 词：高强钢筋 超高性能纤维混凝土 剪跨比 配筋率 斜裂缝宽度 

分 类 号：TU528.571[建筑科学—建筑技术科学]