Testing Research On The Bend Behaviors Of Steel Fiber-Reinforced Concrete Short Beams

Steel fiber reinforced concrete behaves excellent performance, which is extensively used in all kinds of engineering fields. Steel fiber reinforced concrete beam, which is composed of steel fiber reinforced concrete and reinforcing steel bar, is one of the most extensively used structural styles in many engineering applications of steel fiber reinforced concrete. Aiming at researching deficiency of bearing performance of steel fiber reinforced concrete short beams, by means of test research and theory analysis of 16 experimental beams, in which the length of 10 beams are 1200mm, and the length of other 6 beams are respectively 600mm, 900mm ,1500mm, 1800mm, 2100mm, 2400mm, all the section size is 150mmx300mm, A deep and systematic research of the bending behaviors of steel fiber reinforced concrete short beams is made, The main achievements of this paper are as follows:1. The effect of the volume fraction of steel fiber, the category of steel fiber, the ratio of longitudinal reinforcement and the span-depth ratio of the beam on the normal cross sectional strength properties, the failure mode and the flexural capacity of steel fiber reinforced concrete short beams are discussed. Combining with the calculation method of the current GB and codes, the formula for calculating normal section strength of steel fiber reinforced concrete short beams is put forward, which is connected with those of normal steel fiber reinforced concrete beams.2. The various factors of the volume fraction of steel fiber, the category of steel fiber, the ratio of longitudinal reinforcement and the span-depth ratio of the beam affecting the cross-section crack resistance of steel fiber reinforced concrete short beams are discussed. Combining with the calculation method of the current GB and codes, the formula for calculating the cross-section crack resistance of steel fiber reinforced concrete short beams is presented, which is connected with those of normal steel fiber reinforced concrete beams.3. Based on the research of the characterization and contrast of the development of the cracks in the whole loading course, the factors of the volume fraction of steel fiber, the category of steel fiber, the ratio of longitudinal reinforcement and the span-depth ratio of the beam affecting the development of the cracks and the width of the maximum crack in steel fiber reinforced concrete short beams are discussed. According to the calculation method of the current GB and codes, the formula for calculating the width of the maximum crack of steel fiber-reinforced concrete beams is established, which is connected with those of normal steel fiber reinforced concrete beams and normal reinforced concrete short...