方钢管混凝土暗柱内嵌钢板-混凝土组合剪力墙抗震性能试验研究

以某超高层建筑核心筒剪力墙结构为原型，对两端为方钢管混凝土暗柱的内嵌钢板 高强混凝土组合剪力墙进行了拟静力试验研究。试验设计了3个剪跨比为2.0、设计轴压比为0.5的1∶7模型试件，主要变化参数为混凝土强度等级和含钢率。试验结果表明：试件的破坏形态主要为暗柱钢板竖向焊缝开裂、暗柱内混凝土压溃和底部外包钢板局部屈曲，墙中部混凝土的弯剪斜裂缝发展不明显；3个试件的滞回曲线都较为饱满，具有较高的耗能能力，承载力极限状态时的等效黏滞阻尼系数约为0.22；3个试件的屈服位移角平均值为1/214，极限位移角平均值为1/58，延性系数平均值为3.77；在整个加载过程中，弯曲变形和剪切变形对顶点位移的贡献比例基本保持不变，由剪切变形产生的顶点位移约占总顶点位移的20%。

Experimental study on seismic behavior of steel plate reinforced concrete composite shear walls with square CFST concealed columns

This paper presents experimental study on the seismic behavior of steel plate reinforced high-strength concrete composite shear walls with square concrete filled steel tube concealed columns. Three specimens with shear-span ratio of 2.0 and designed axial compression ratio of 0.5 were tested under cyclic loading. The variable parameters were concrete strength and steel ratio. The results indicate that the failure patterns of the tested walls includ fracture of the vertical weld between adjacent steel plates, crushing of the concrete in the concealed columns, local buckling of the outside steel plates. The exposed concrete in the middle of the tested walls don’t crack seriously. All the three tested walls exhibite good hysteretic behavior and high energy dissipation capacity. The equivalent viscous damping coefficient at the ultimate state is about 0.22 for all the specimens. The average values of the yield drift angle, ultimate drift angle and ductility factor for the three tested walls are 1/214, 1/58 and 3.77, respectively. The ratio of the top displacement due to flexure deformation and shear deformation kept nearly constant during the whole loading process, and the top displacement due to shear deformation is about 20% of the total top displacement.