NONLINEAR FORCE-DRIFT BACKBONE CURVE FOR REINFORCED CONCRETE SQUAT SHEAR WALLS

摘要

Reinforced concrete shear walls with low aspect ratio are commonly used in nuclear structures as part of the lateral-load-resisting system of the structure. This paper discusses and proposes a new approach for constructing the nonlinear force-drift backbone curve of reinforced concrete squat shear walls, including those with openings. The proposed nonlinear force-drift backbone curve for squat shear wall response accounts for flexural cracking and yielding, shear cracking, slip of reinforcing bars, peak strength, ultimate drift capacity, and hysteretic degradation under reversed cyclic loading. The force-drift model is developed and validated against an experimental database of low aspect ratio shear walls, and database reduction criteria for a practical application of the model are demonstrated. The proposed modeling approach is then used to characterize the response of shear walls with openings in a global building finite element model suitable for use in a seismic nonlinear pushover analysis.