Finite Element Analysis On Reinforced Concrete Shear Behavior Of Deep Flexural Members

The design of reinforced concrete members requires to prohibit brittle failure, but shear failure is brittle. To avoid such kind of brittle failure, it is necessary to understand shear mechanism in detail. When the cross-height ratio of simply supported beam or multi-span continuous beam is less than 5, we call it deep flexural members based on our National norms. Due to the complexity of shear behavior, most shear design code provisions are principally empirical and just based on a limited number of test data available. In order to verigfy these codified equations whether also appropriate for memebers with parameters out of such limited set of test data, there is imperitive to set up a databank of RC shear beams, and furthermore, to evaluate the codified methods of shear design on such a basis.By the existing test about reinforced concrete deep flexural members,18 reinforced concrete simply-supported beams with web reinforcement, with shear span ratio, stirrup reinforcement ratio and longitudinal reinforcement ratio varying, were analyzed using nonlinear finite element analysis program, ANSYS. In the mean time, the effect of stirrup reinforcement ratio and longitudinal reinforcement ratio was also discussed.With an extensive literature review,300 test data has been extracted and compiled into a shear database of reinforced concrete beams with web reinforcement, and these parameters are include section size, shear span ratio, loading, vertical web reinforcement steel and the reinforcement rate, details please view the addendum. The author analyzed the general rules of 119 short beams with web reinforcement and then compared the test data with China Design Code of Reinforced Concrete Structures, through comparative analysis of shear strength by bending the formula put forward proposals to adjust.Into the finite element analysis had reached the following conclusions:Bending of reinforced Concrete Beams is decrease with the increase of span ratio; for members with vertical and horizonal shear reinforcement, when the shear span ratio greater than one, Bending of reinforced Concrete Beams is as positively proportional to the stirrup; for members with vertical and horizontal shear reinforcement, Bending of reinforced Concrete Beams is as positively proportional to the longitudinal reinforcement ratio. Using the established database, reference to national norms and using linear regression method to have been the strengthening of the adjustment factor stirrups item K, as well as shear coefficient K of concrete is proposed to be 1.05 for the shear capacity, it's applicability of certain to predict the shear resistance about short beams those with horizontal and vertical web reinforcement.