型钢混凝土中高剪力墙抗震性能改善措施试验研究

边框约束区设置竖向型钢的普通型钢混凝土（SRC）剪力墙在实际工程中大量应用。为研究在普通SRC中高剪力墙腹板内增设竖向型钢、在边框暗柱区底部外包钢套筒两种加强措施对提高其抗震性能的有效性，通过7片一字形截面剪力墙的拟静力试验，对竖向型钢设置位置、钢套筒不同构造措施的受力机理以及对剪力墙抗震性能改善效果及原因等进行了分析。试验结果表明：在SRC中高剪力墙的腹板区域内设置竖向型钢对试件水平承载力影响不大，对试件的变形及耗能能力则有明显不利影响；在边框暗柱区底部外包具有一定高度的钢套筒可使剪力墙形成合理的破坏模式，有效提高墙体的极限变形能力；当钢套筒未嵌入基础时，墙体的极限变形能力提高约25%；当钢套筒嵌入基础后，墙体的极限变形能力提高100%以上，破坏位移角达到1/40。

Experimental investigation on strengthening strategies for mid-rise SRC shear walls against seismic action

Steel-reinforced concrete (SRC) shear wall are widely used in engineering practice. To improve the seismic behavior of mid-rise SRC shear walls, two approaches, i.e., built-in vertical steels in the web and enwrapping rectangular steel tubes at the bottom of concealed columns in the wall, are investigated. Based on pseudo-static tests on seven mid-rise SRC shear wall specimens, the working mechanisms and benefits of the vertical steel position and different structural measures of steel tubes were analyzed. The results show that setting vertical steel in the web of mid-rise SRC shear wall has little effect on the specimen’s horizontal bearing capacity, but has an obvious adverse effect on the specimen’s deformability and energy dissipation. Enwrapping rectangular steel tubes with a suitable height at the bottom of the concealed columns could lead to a reasonable failure mode and effectively increases the ultimate deformation ability of the wall. The ultimate deformation of the wall is increased by 25% when the tubes are set at the top of the foundation. When the tubes are embedded in foundation, the ultimate deformation ability is increased by more than 100% and the ultimate drift ratio reaches 1/40.