The Research On Shearing Resistance Properties And The Calculation Method Of Oblique Section Of Composite Beam

The essential cause between reinforced concrete composite beam and the whole casting beams of different properties lies in the second phase of composite beam casting and the second stage loading process .This paper summarizes the recent advances on the shearing resistance properties of oblique section of composite beams research results and sums up its mechanical properties systemically, such as the oblique cross-section failure mode, failure mechanism ,shear stress re-distribution and the analysis of its bearing capacity factors and so on.Through summing up the results of previous studies found that the main factors affecting the shearing resistance strength of oblique section of composite beams are concrete strength, the role of stirrups , the ratioof forward and backward beams' highαh, the ratio of M 1and prefabricated products ultimate moment valuesαM, shear-span ratioλ, the dowel action of longitudinal reinforcement and so on . Using the grey correlative method to analyze the correlation of various factors and chose the reasonable factors in order to make preparation for formula.In this paper, It is more vividly to notice that the shear stress-exceeding of prefabricated parts, shear stress-lagging of composite parts , loading pre-stressed ,the phenomenon of stirrup stress ahead, the phenomena of longitudinal reinforcement stress ahead and other properties by simulating composite beam and contrasting beam, comparative analysis.The article also summarizes the formula of Shear-bearing capacity of composite beam which were finished by the predecessors. using ANSYS to carry out numeral simulation on a total of 35 beams contained by two groups and the impact of the composite parameters (αh,αM)and strength grade of concrete on Shear-bearing capacity of composite beam was discussed. Combining the Concrete Specification formula , Iinput forward the formula of Shear-bearing capacity of oblique section which can consider the strength grade of concrete and composite parameters of the beneficial effects. That will provide a frame of reference for the future composite beams in-depth theoretical study and engineering design.