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THIS PAPER PRESENTS THE IMPLEMENTATION OF A NONLINEAR GEOMETRICAL FORMULATION, BASED ON POSITIONAL FINITE ELEMENT METHOD, TO DESCRIBE THE VISCOELASTIC MECHANICAL BEHAVIOR OF SPACE TRUSSES. THE FORMULATION DESCRIBES THE POSITIONAL VARIATION OVER TIME OF THE TRUSS MEMBER UNDER CONSTANT STRESS STATE (CREEP). THE PROPOSED METHODOLOGY CONSIDERS A STANDARD SOLID RHEOLOGICAL MODEL TO DESCRIBE STRESS-STRAIN TIME-DEPENDENT LAW IN ORDER TO PREDICT THE CREEP BEHAVIOR. THE EFFECTS OF THE MODEL PARAMETERS IN THE MECHANICAL RESPONSE OF THE STRUCTURE WITH ACCENTUATED GEOMETRIC NONLINEARITY WERE PRESENTED. MODEL CALIBRATION WAS PERFORMED USING TEST DATA FROM LITERATURE AND A GLASS FIBER REINFORCED PLASTIC (GFRP) TRANSMISSION LINE TOWER CROSS-ARM WAS SIMULATED TO PREDICT THE EVOLUTION OF DISPLACEMENTS UNDER OPERATIONAL LOADS.
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