THREE-DIMENSIONAL FINITE ELEMENT ANALYSIS OF COMPRESSIVE BEHAVIOR OF CIRCULAR STEEL TUBE-CONFINED CONCRETE STUB COLUMNS BY NEW CONFINEMENT RELATIONSHIPS
Keywords:CONFINED CONCRETE, FINITE ELEMENT ANALYSIS, COMPOSITE COLUMN, MODELING, PARAMETRIC STUDY
AbstractTHIS PAPER PRESENTS A NONLINEAR ANALYSIS OF AXIALLY LOADED STEEL TUBE-CONFINED CONCRETE (STCC) COLUMNS WITH NEW CONFINEMENT RELATIONSHIPS. FOR THIS AIM, A 3-D FINITE ELEMENT MODEL OF STCC COLUMNS USING ABAQUS PROGRAM IS DEVELOPED AND VALIDATED AGAINST THE EXPERIMENTAL DATA. PROPER MATERIAL CONSTITUTIVE MODELS ARE PROPOSED AND THE CONFINEMENT PARAMETERS OF CONFINED CONCRETE ARE DETERMINED BY MATCHING THE NUMERICAL RESULTS VIA TRIAL AND ERROR. THE PARAMETERS CONSIDERED FOR QUANTITATIVE VERIFICATION OF THE FE MODEL INCLUDE FIVE DIFFERENT FACTORS INDICATING THE BEHAVIOR OF STCC COLUMNS: COMPRESSIVE STRENGTH CORRESPONDING TO STEEL YIELDING POINT, INITIAL PEAK STRENGTH AND ULTIMATE STRENGTH AS WELL AS LONGITUDINAL TO CIRCUMFERENTIAL STRESS RATIO OF STEEL TUBE AT STEEL YIELDING POINT AND INITIAL PEAK POINT. FOR THE QUALITATIVE VERIFICATION, THE AXIAL AND LATERAL STRESSÂSTRAIN RELATIONSHIPS OF STCC COLUMNS ARE TAKEN INTO ACCOUNT. FINALLY, A PARAMETRIC STUDY IS ALSO PERFORMED TO EVALUATE THE EFFECT OF TUBE DIAMETER-TO-WALL THICKNESS RATIO, CONCRETE COMPRESSIVE STRENGTH AND STEEL YIELD STRENGTH ON THE COMPRESSIVE BEHAVIOR OF STCC COLUMNS.
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