Experiment on Flexural Bearing Capacity of Hooked-end Steel Fiber Reinforced Concrete Simply-supported Beam
In order to improve the disadvantages of ordinary reinforced concrete beams,such as large deadweight,easy cracking and low bearing capacity,steel fiber is often added to concrete.As a common high-performance steel fiber,hooked-end steel fiber was widely concerned.Scholars at home and abroad carry out a lot of research on the basic mechanical properties of hooked-end steel fiber reinforced concrete,but the bending members of hooked-end steel fiber reinforced concrete needs further study.In order to study the flexural behavior of hooked-end steel fiber concrete simply-supported beam,four hooked-end steel fiber reinforced concrete beams and one reinforced concrete beam were made,and their flexural behavior tests were carried out.According to the failure form,bearing ca-pacity,load-deflection curve and load-strain curve were obtained from the tests,the influence of the volume content of the hooked-end steel fiber on the flexural bearing capacity and failure form of the specimen was analyzed.The results show that the bending process of hooked-end steel fiber reinforced concrete simply-supported beams is similar to that of ordinary concrete beams,and they have experi-enced four stages:elasticity,cracking,working with cracks,and failure.The bending process of hooked-end steel fiber reinforced con-crete simply-supported beams and ordinary concrete simply-supported beams basically conforms to the"plane section assumption".Hooked-end steel fiber restricts the generation and development of cracks,and enhances the deformation ability of steel fiber reinforced concrete beams.Compared with ordinary concrete beams,the crack resistance and ultimate bearing capacity of hooked-end steel fiber reinforced concrete beams are improved,and the bearing capacity of members is basically positively correlated with the volume content of steel fiber.Based on the test data,the calculation formula of cracking moment and ultimate bearing capacity in the current code is optimized.In the aspect of cracking moment,it is considered to modify the plastic influence coefficient of section resistance moment,and in the aspect of ultimate bearing capacity,the influence coefficient of normal section bearing capacity of fiber reinforced concrete is introduced ζ.The corrected calculated value can be in good agreement with the test value.
万方数据
维普
