钢管-双层钢板-混凝土组合剪力墙抗震性能试验研究

提出一种适用于超高层建筑底部楼层的钢管-双层钢板-混凝土组合剪力墙，通过5个剪跨比为2.5的一字形截面组合剪力墙试件的拟静力试验，研究组合剪力墙的抗震性能。试验结果表明：试件的破坏形态为压弯破坏，墙底部边缘构件矩形钢管管壁和钢板鼓曲、钢管断裂、混凝土压溃；矩形钢管混凝土约束边缘构件沿墙肢长度显著影响试件的变形能力和耗能能力；钢板含钢率基本不影响试件的变形能力；矩形钢管混凝土边缘构件内设置圆钢管可提高试件承载力，但对其变形能力影响不大。矩形钢管混凝土约束边缘构件沿墙肢长度为0.2倍墙截面高度、设计轴压比为0.45时，组合墙试件的屈服位移角不小于0.005 rad、极限位移角可达0.030 rad。提出组合墙正截面承载力的计算式，计算结果与试验值吻合较好，误差小于10%。

Experimental study on seismic behavior of steel tube-double steel plate-concrete composite shear walls

This paper proposed an innovative composite wall, named the steel tube-double plate-concrete composite shear wall, which is suited for use in the lower stories of super high-rise buildings. The seismic behavior of the composite walls was examined through results of an experimental research program where five rectangle-shaped wall specimens with a shear span ratio of 2.5 were tested. The test results indicate that the specimens fail in a flexural mode, characterized by local buckling of boundary steel tubes and steel plates, fracture of steel tubes, and compressive crushing of concrete at the wall base. The extent of concrete filled steel tubular (CFST) boundary elements significantly affects the deformation and energy dissipation capacities of the composite walls. The area ratio of steel plate has a minimal effect on the deformation capacity of the wall specimens. The addition of circular steel tubes embedded in the CFST boundary elements leads to an increase in the lateral load-carrying capacity of the composite walls, but it does not increase the wall’s deformation capacity. When the CFST boundary element’s extent is 02 times the wall’s sectional depth and the designed axial force ratio is 0.45, the wall specimen has a yield drift ratio of over 0.005 rad and an ultimate drift ratio of 0.030 rad. In addition, simplified formulas used to calculate the flexure strength of the composite walls were proposed. The evaluated results show good agreement with the test results, with errors no more than 10%.