型钢混凝土T形截面构件抗震性能试验研究

The cyclic reversed loading tests were carried out on fifteen T-shaped steel reinforced concrete members to research the seismic failure mechanism of the steel reinforced concrete special shaped columns and steel reinforced concrete short leg shear walls. The effects of steel form, loading direction, shear-span ratio, limb height to thickness ratio, axial compressive ratio and stirrup ratio on the seismic performance of T-shaped steel reinforced concrete members were analyzed. The predicting model of bi-directional shear capacity of T-shaped steel reinforced concrete members was put forward based on the classical theory of four leaf petals. The results show that shear failure can occur to members with small shear-span ratios or configured with hollow-web steel, while the flexural failure may occur to members with large shear-span ratios or configured with solid-web steel; in addition, the bond failure is easy to occur to members without reinforcement cage outside the shape steel. The shear capacity, stiffness degradation, displacement ductility, inter-story drift and energy-dissipating capacity of T-shaped members configured with solid-web steel are larger than those of T-shaped members configured with hollow-web steel. The 45° loading direction is beneficial to two limb mechanical properties of members. The increase of limb height to thickness ratio linearly enlarges the load carrying capacity but decreases the displacement ductility and energy-dissipating capacity of T-shaped members. It is confirmed by inter-story drift that T-shaped steel reinforced concrete short leg shear wall is a structural form which is between column and shear wall. Axial compressive ratio can enhance the shear capacity but reduce the deformation capacity, and stirrup ratio can both enlarge the shear capacity and deformation capacity.