Study On The Shear Behavior Of The Beam Replaced Stirrup By Hybrid Fibers

Reinforced concrete is the most important architectural and structural materials in the field of civil engineering. But the durability problem of concrete is the most increasingly attention, and extremely need to solve the problem. The stirrup is too closer or improper configuration factors such as shear in the traditional concrete, not only affect the quality of pouring concrete, but also reduce the reinforcement in concrete bond strength and thickness of concrete protective layer, leading to the safety and durability of structures decrease. In order to improve the durability of reinforced concrete structures,the experts propose to use the fiber-partially or substitute for structural stirrups in concrete structure.This topic select hybrid fiber reinforced-self compacting concrete as the research object, through the hybrid fiber-validation of 7 different fiber content of reinforced self compacting concrete rectangular beams are symmetrical concentrated loading. Deeping research of hybrid fiber on self compacting concrete beams shear capacity of inclined cracks and damage forms, the influence rule, the main analysis of the shear displacement curve, stirrup strain and concrete strain. The test results show that, the hybrid fiber certain dosage could make some or all of the alternative concrete beam stirrups, residual peak of self compacting concrete beams after bearing capacity and anti deformation ability. Hybrid fiber can change the failure mode of concrete beam, the beam from brittle shear failure to ductile flexural failure.In one word, through the test results, using fiber to replace some or all stirrups is an effective way to improve the shear resistance of reinforced concrete beam bearing capacity of concrete pouring quality. So the research of hybrid fiber partly or in whole instead of structural concrete beams without stirrups has important engineering significance and scientific significance and shear performance.