Experimental study on seismic behavior of L-shaped-section steel reinforced high-strength concrete shear walls for core tube of super-tall buildings

Abstract

High-strength concrete and shape steel are combined to form composite shear wall members to address the cross-section oversize of core tube shear walls at the bottom of tall and super-tall buildings. However, the existing investigation focus on rectangular shear walls, and insufficient study has been conducted on L-shaped shear walls. To better understand the seismic performance of L-shaped-section steel reinforced high-strength concrete (f_cu≥ 60 MPa) shear walls (LSRHCW), four such specimens with distinct dimensions, reinforcement ratios and concrete strengths were tested under cyclic loading and high axial compression ratio (n = 0.5), and the lateral cyclic loading direction makes an angle of 45° with the wall limb length direction. The influence of improving concrete strength and reducing the steel and reinforcement ratios on the seismic performance is investigated. The results show that under high axial compression ratio, the specimens fail in flexure-shear mode due to strength reduction caused by concrete crushing, and exhibit excellent deformation performance (maximum drift ratio capacity, 3.03%). The wall specimens built with different strength concrete and shape steel ratios demonstrate comparable strength, deformation and initial stiffness. This suggests that the reinforcement ratio of LSRHCWs can be effectively reduced by upgrading concrete strength, while still maintaining their seismic performance.

Graphical abstract

Keywords

L-shaped-section steel reinforced high-strength concrete shear walls / loading direction / seismic performance / cyclic loading test / high axial compression ratio

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