Shear Bearing Capacity Of Steel Fiber High-strength Concrete Low-rise Shear Wall

Shear wall is widely used because of its great lateral rigidity and bearing capacity.High-strength concrete has higher compressive strength,but its sizable brittleness reduces the ductility of high-strength concrete component.The ductility of high-strength concrete shear wall can be improved by steel fiber.In this paper,the test data of related concrete shear wall literature is collected and analyzed,and the factors of affecting the shear capacity of shear wall are discussed;The applicability of the calculation methods of shear bearing capacity for steel fiber reinforced concrete shear wall in relevant codes is compared and analyzed;Finally,the calculation method based on the modified compression field theory for shear bearing capacity of steel fiber high-strength concrete low-rise shear walls is established.The study shows that:(1)As the increase of the steel fiber ratio,shear capacity of shear wall increases,and the increment is highest when the steel fiber volume rate is 1.0~1.5%.The shear capacity increases with the increase of compressive strength of the concrete,but decreases with the increase of shear span ratio.The steel tube can restrain the concrete of the column and the wall effectively,and then improve the shear capacity.As the axial compression ratio increases,the shear capacity increases first and then decreases.(2)The calculated values of shear capacity of steel fiber reinforced concrete shear wall obtained by Chinese code and American code is closely approximate to the test value,but is conservative;the calculated value obtained by European code and Japanese code is lower than the test values.(3)Through combining with the relevant test data,considering the reinforcement of steel fiber,the shear capacity calculation method of steel fiber reinforced high-strength concrete shear wall based on the modified pressure field theory model is more applicability.