T形型钢混凝土剪力墙抗震性能研究

Investigation on Seismic Behavior of T-shaped Steel Reinforced Concrete Shear Wall

设计并制作了3片T形型钢混凝土剪力墙试验模型,沿腹板方向进行水平低周反复加载。采用ANSYS有限元软件建立了T形型钢混凝土剪力墙模型进行非线性分析,并验证其合理性;同时,探讨了不同荷载施加部位以及轴压比对结构受力性能的影响。结果表明:试件滞回曲线均比较饱满,延性系数均大于3.0,说明该结构有较强的塑性变形能力和耗能能力。在相同轴压比条件下(轴压比为0.4),沿腹板受压方向加载,仅有翼缘承受竖向荷载的T形剪力墙模型的屈服荷载和极限承载力,均大于全截面受压的剪力墙,而沿腹板受拉方向加载时,翼缘承受竖向力的剪力墙的屈服荷载和极限承载力均小于全截面受压的剪力墙。随着轴压比的增大,承载力沿腹板受压方向提升较为明显,而沿腹板受拉方向提升幅度很小。在试验中后期,腹板部分产生由剪力墙腹板顶部与翼缘交接处的斜裂缝,应对剪力墙腹板顶部与翼缘交接部分进行加强,将该部位分布钢筋加密布置。

Three experimental models of T-shaped steel reinforced concrete shear walls were designed and made,and the horizontal low cycle loading was carried out along the web direction.The model was established by finite element program ANSYS for nonlinear analysis,and its rationality was verified.At the same time,the influence of different loading position and axial compression ratio on the mechanical performance of the structure was discussed.The results show that the hysteretic curves of the specimens are plump,and the ductility coefficients are greater than 3.0,which indicates that the structure has strong plastic deformation capacity and energy dissipation capacity.Under the same axial compression ratio(axial compression ratio is 0.4).When horizontal load causes web to be compressed,the yield load and ultimate bearing capacity of model with flange bearing vertical load are greater than those of the shear wall model with full section compression.When horizontal load causes web to be tensioned,while the yield load and ultimate bearing capacity of shear wall model with flange bearing vertical load are less than those of shear wall model with full section compression.With the increase of axial compression ratio,the bearing capacity increases obviously along the compression direction of the web,but the increase range along the tension direction of the web is very small.In the middle and later stage of the test,the inclined cracks at the junction of the top of the web and the flange of the shear wall occur in the web part,so the junction of the top of the web and the flange of the shear wall should be strengthened,the distributed reinforcement of this part should be densely arranged.