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Physically Based Cyclic Tensile Model for RC Membrane Elements
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DOI：10.1061/(ASCE)ST.1943-541X.0001590.png)
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Abstract
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A physically based tensile model for RC membrane elements subjected to cyclic loading conditions is presented. Average concrete stresses are derived from equilibrium, compatibility, and constitutive relationships of a cracked RC element under biaxial stress-strain conditions. Cyclic bond degradation is explicitly accounted for in the equations governing tension-stiffening, crack-closing, and crack-opening. The proposed tensile model is combined with a compressive cyclic model to fully describe the axial response in the normal and parallel-to-the-crack directions. Along the crack, the constitutive model for shear is based on a new shear modulus, which allows divergence between principle stress and strain directions while satisfying equilibrium and compatibility conditions. The model is implemented within a fixed-crack membrane finite element and verified against experimental tests on shear panels and RC walls.
Keywords:
RC membrane elements
Tensile model
Cyclic shear
Bond-slip
Nonlinear finite-element analysis
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