Shear Strength Analysis of Steel Fiber Reinforced Concrete Beams with Reinforcement

Based on plastic theory,the yield formulas of reinforced bar,concrete and steel fiber reinforced concrete were confirmed.Then the diagonal sectional failure mode with two displacements of steel fiber reinforced concrete beams with reinforcement was established.With the plastic ultimate analysis and the method of energy,We deduce the function expression of the load that lead to the failure in shear of oblique section,then we optimize it to get the limit loads.Through adjusting the thickness of steel fiber reinforced concrete,the formula put forward in this article can also be applied to the calculation of the limit load of common reinforced concrete girder,a part of concrete beam which are reinforced by steel fiber and the total cross-section of concrete beam which is reinforced by steel fiber when their oblique sections are failure by shear.The calulation of the examples proves that the calculation theory and method are correct.