Unified Strain-Based Procedure To Obtain Design P-M Interaction Curves of Slender RC Wall Sections

Abstract eng:
Reinforced concrete structural walls, suitably located in plan, function as the main lateral load resisting elements in buildings. Rectangular and flanged cross-sections are traditionally adopted in practice, depending on functional and architectural requirements of buildings; for instance, C-shaped walls are used as single elevator core in buildings, L-shaped walls at corners of buildings, and T-shaped walls at the periphery of buildings. Axial force – bending moment (P-M) interaction diagram is required of these wall sections for design of relatively slender walls. But, generation of design P-M interaction curve is iterative, and thus, computationally expensive. The paper presents a simple unified strain-based procedure to obtain design P-M interaction curves of both rectangular and flanged RC wall cross-sections. The proposed non-iterative procedure provides closed-form expressions that satisfies compatibility of normal strains, equilibrium of forces, and uses design constitutive relations of the materials. The results obtained compare well with those using traditional nonlinear analyses.

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