Plastic seismic design of ductile reinforced concrete frame–shear wall dual systems
Abstract
Abstract This paper presents a static plastic design methodology for reinforced concrete (RC) frame–shear wall dual systems that ensures the attainment of a ductile global collapse mechanism while remaining fully compatible with current seismic provisions. Unlike existing performance-based plastic design approaches that rely on soft-story mechanism assumptions incompatible with slender RC shear walls, the proposed framework directly enforces a beam-sway mechanism through global static equilibrium and energy consistency. The methodology introduces a lateral load-sharing parameter (ρ) to coordinate frame–wall interaction and incorporates a systematic overstrength factor (Ω) recalculation procedure based on probable member strengths to maintain consistency between assumed and actual plastic capacities. P–Δ effects and code-prescribed seismic force distributions are explicitly integrated, eliminating the need for assumed ductility reduction factors or artificial mechanism constraints. The framework is applied to 5-, 10-, and 15-story prototype dual systems. Nonlinear static (pushover) and nonlinear response history analyses (NRHA) under real ground motions confirm that the proposed methodology successfully enforces the intended global mechanism. Plastic hinges form predominantly in the beams and at the base of the vertical elements, while columns and the upper portions of the shear wall remain essentially elastic. The results demonstrate that this approach provides structural…
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