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ASPECTS ABOUT THE NUMERICAL MODELING OF THREE-DIMENSIONAL PRESTRESSED STEEL-CONCRETE COMPOSITE BEAMS BY USING THE FINITE ELEMENT (FE) METHOD ARE HIGHLIGHTED AND COMMENTED IN THIS WORK. EMPHASIS IS GIVEN TO THE NUMERICAL TREATMENT OF BONDED AND UNBONDED TENDONS. BONDED TENDONS ARE EMBEDDED IN THE REINFORCED CONCRETE (RC) SLAB, AND ARE TOTALLY ADHERED TO THE ADJACENT CONCRETE. OTHERWISE, UNBONDED TENDONS MAY BE POSITIONED INTERNALLY OR EXTERNALLY TO THE RC SLAB. INTERNAL UNBONDED TENDONS MAY SLIP IN RELATION TO THE SURROUNDED CONCRETE ALONG ITS ENTIRE LENGTH, WHEREAS EXTERNAL TENDONS ONLY SLIP AT DEVIATOR DEVICES LOCATED ALONG THE LONGITUDINAL DIRECTION OF THE STEEL BEAM. THE PROPOSED MODELING TECHNIQUE USES CURVED BEAM AND CATENARY ELEMENTS FOR SIMULATING INTERNAL AND EXTERNAL TENDONS, RESPECTIVELY. CATENARY ELEMENTS CAN BETTER REPRESENT CURVED SHAPES WITH FEWER ELEMENTS IN RELATION TO COMMOM TRUSS ELEMENTS. OTHER ISSUES SUCH AS THE CONSTITUTIVE MODEL FOR SHEAR CONNECTORS, STEEL BEAM AND CONCRETE ARE ALSO DISCUSSED. SEVERAL NUMERICAL EXAMPLES WITH EXPERIMENTAL AND NUMERICAL RESULTS ARE PRESENTED. IT IS ENCOUNTERED THAT A FASTER NUMERICAL CONVERGENCE IS ACHIEVED WHEN THE TENDON STIFFNESS IS INCLUDED IN THE OVERALL STIFFNESS OF THE STRUCTURE, EVEN WHEN THE UNBONDED INTERNAL SITUATION IS ADRESSED. MOREOVER, OMITTING SLIPPING AT THE DEVIATOR DEVICE MAY LEAD TO INNACURATE RESULTS IN THE EVALUATION OF TENDON FORCES FOR EXTERNAL PRESTRESSING. FAVOURABLE AGREEMENT IS ENCOUNTERED FOR ALL STUDIED EXAMPLES.&NBSP;&NBSP;&NBSP;
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