Mechanism Research On Improvement Of Mechanical Performance Of Low-Rise Steel Reinforced Concrete Shear Wall With Built-in Vertical Steel

The low-rise steel reinforced concrete shear wall with built-in vertical steel is a type of composite shear wall,which is placed a series of vertical steel in the web of normal steel reinforced concrete shear wall.Compared with steel bracing or steel plate placed in the web of shear wall,the built-in vertical steel owns the advantages of simple structural connection and construction technology, liable construction quality. The built-in vertical steel in the web can effectively share the force of the concrete web,and also improve deformation performance of the low-rise shear wall.However,the theoretical and experimental research on the low-rise steel reinforced concrete shear wall with built-in vertical steel is less.Further mechanism research on improvement of mechanical performance of low-rise steel reinforced concrete shear wall with built-in vertical steel is needed,and also lack of systemic research on the rational arrangement scheme and performance improvement effects of the built-in vertical steel.Considering the mechanical behavior characteristics of low-rise SRC shear walls,the thesis bulit the finite element model,which is suitable for analysing the mechanical performance of the SRC low-rise shear wall and adopt proper material constitutive relationship,whose validity is proved by compraring with the experimental research early.According to the experimental results and finite element simulation, force-transmission mechanism of SRC low-rise shear wall is agreement with softened strut-and-tie model,which can analysis the mechanism of built-in vertical steel action. On the basis of mechanism analysis,the factors on the mechanical performance of low-rise steel reinforced concrete shear wall with built-in vertical steel is analyzed. Accordding to the analysis results,this thesis presents some initial design suggestion. The simulation analysis results indicate: 1) The built-in vertical steel placed in the web can share the force of diagonal strut,and also bear the force when the web concrete crush, which effectively improve the deformation performance of SRC low-rise shear wall. 2)the method adopted to improve the deformation performance of the low-rise steel reinforced concrete shear wall with built-in vertical steel,is only suitable for test specimens at mid or high axial compression ratio. 3) when design of axial compression ratio is 0.3~0.6 and shear span ratio is 0.8~1.2,the distance between the bulit-in vertical steel location and the outer edge of shear wall is 0.375b(b is width of the shear wall),the effect of vertical steel on the deformation performance of SRC low-rise shear wall is optimal. 4)According to the finite element results,at common axial compression ratio and shear span ratio,this thesis come up with the minimum steel ratio of embedded column in the web which is satisfied with the ultimate displacement angle confined by code.