Anti-shear Analysis Of Concrete Column Within Yield Hinge Regions Based On Trussed Arch Model

The past earthquake shows that the destroying of reinforced concrete frame columns within yield hinge regions was most due to the shearing.Yield hinge always appears first at the end of the columns.The analysis on the anti-shear mechanism of yield hinge regions is relatively little today.Because of that,research the affect in shear capacity of concrete columns under cyclic load and put forward a formula to compute the anti-shear strength of concrete frame column within yield hinge regions is very necessary.This thesis analyze the destroy ways of the reinforced concrete frame columns and the influence factors of it's shear performance.By studying the shear mechanism of reinforced concrete columns,the anti-shear formula of concrete frame columns within yield hinge regions based on trussed arch model is derived.Based on the tests,nonlinear finite element analysis of RC frame column within yield hinge regions under cyclic load is studied,and some comparison was done between the results of experiment and computation.,at last,put forward the formula of anti-shear capacity.The research of this thesis is:(1)Analysis the influence factors and anti-shear mechanism of the yield hinge regions of concrete frame column,put forward the trussed arch model fit to the concrete frame column firstly.This model combines the affect of trussed model with the arch bridge model.Based on the consider of soften of the concrete frame columns within yield hinge regions and the affect of the cyclic loading,this paper put forward the formula that could be used to design the displacement ductility of the yield hinge regions in reinforced concrete.(2)Used ANSYS software to do the nonlinear finite element analysis on 6 reinforced concrete frame and get the specimens'destructive fissure,stress nephogram,the calculated value of load and the displacement of every node.And then compare the results with the tests,it shows that they fit well and the finite element model is correct.(3)By comparing the computing and experiment results,and considering safety margin and the National standard,this paper put forward the anti-shear design formula of reinforced concrete column,the formula is simple and practical.The research of this thesis is valuable,it could give basis to the National standard.