摘要
为研究聚丙烯纤维混凝土梁在单调荷载作用下的受剪性能,考虑纤维掺量、剪跨比、配箍率和混凝土强度等级的影响,制作9根聚丙烯纤维混凝土梁,对其进行受剪性能试验.根据试验得到的破坏形态、荷载-挠度曲线和受剪承载力实测值,分析不同参数对试件的破坏形态、受剪承载能力、刚度和剪切延性的影响.研究结果表明:混凝土裂缝间的纤维可延缓裂缝发展、减小斜裂缝倾斜角度、提高构件受剪性能,且聚丙烯纤维混凝土梁较普通混凝土梁具有更好的承载能力、刚度和剪切延性.基于修正压力场理论,考虑了纤维混凝土抗拉强度对受剪承载力的贡献,建立了聚丙烯纤维混凝土梁受剪承载力计算公式,并通过国内外26组聚丙烯纤维混凝土梁受剪承载力试验数据对其进行验证,理论计算值与试验值之比的平均值为1.049,标准差为0.107,变异系数为0.102,二者吻合较好.
In order to study the shear performance of polypropylene fiber concrete beams under monotonic loading,nine polypropylene fiber concrete beams were constructed and tested considering the effect of fiber content,shear span ratio,stirrup ratio and concrete strength grade.According to the failure mode,load-deflection curve and shear bearing capacity measured by the test,the influence of different parameters on the failure mode,shear bearing capacity,stiffness and shear ductility of the specimen was analyzed.The results show that the fiber between concrete cracks can delay the development of cracks,reduce the inclination angle of diagonal cracks,and improve the shear performance of structures.The polypropylene fiber concrete beams had higher capacity,stiffness and shear ductility than the ordinary concrete beams.Based on the modified compression field theory,and considering the contribution of tensile strength of fiber concrete to the shear bearing capacity,a calculation formula of shear capacity for polypropylene fiber concrete beam was established and verified by the test data of the shear capacity for 26 sets of polypropylene fiber concrete beams.The mean,standard deviation and coefficient of variation of the calculated-to-tested value were 1.049,0.107 and 0.102,respectively,which indicated that these two results were in good agreement.
作者
张广泰
张路杨
邢国华
魏飞来
陆东亮
ZHANG Guangtai;ZHANG Luyang;XING Guohua;WEI Feilai;LU Dongliang(School of Architecture and Engineering,Xinjiang University,Urumqi 830047,China;School of Civil Engineering,Chang'an University,Xi'an 710061,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第5期70-77,共8页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(51868073)。
关键词
修正压力场理论
聚丙烯纤维
抗拉强度
受剪承载力
modified compression field theory
polypropylene fiber
tensile strength
shear capacity
