COMPARISON OF TWO FORM METHODOLOGIES FOR REINFORCED CONCRETE BEAMS UNDER FLEXURE
THE RESPONSE OF A REINFORCED CONCRETE STRUCTURE IS INFLUENCED BY THE VARIABILITY OF DESIGN PARAMETERS SUCH AS CONCRETE AND STEEL STRENGTH, THE GEOMETRY OF THE STRUCTURAL ELEMENT, AND THE LOAD INTENSITY. IN THIS CONTEXT, ONE OF THE MOST RATIONAL WAYS TO ASSESS THE SAFETY LEVEL OF A REINFORCED CONCRETE STRUCTURE IS TO EMPLOY A PROBABILISTIC APPROACH. IN THIS WAY, THIS PAPER AIMS TO COMPARE THE RELIABILITY INDEXES FOR A SET OF REINFORCED CONCRETE BEAMS ACCORDING TO TWO DIFFERENT RELIABILITY METHODOLOGIES, BASED ON THE ASSOCIATION OF EXTERNAL FORM (FIRST-ORDER RELIABILITY METHOD) SUBROUTINES WITH THE ANSYS SOFTWARE. IN THE FIRST METHODOLOGY, THE RELIABILITY INDEXES WERE ASSESSED THROUGH THE DIRECT COUPLING OF THE FORM ALGORITHM TO THE FINITE ELEMENT MODEL. IN THE SECOND METHODOLOGY, THE RESPONSE SURFACE METHOD (RSM) WAS EMPLOYED, BASED ON THE FE RESULTS, TO FIT A FLEXURAL RESISTANCE FUNCTION OF THE BEAMS, BEING THE RELIABILITY INDEXES ASSESSED BY AN EXTERNAL FORM ALGORITHM. THE RESULTS SHOWED THAT BOTH METHODOLOGIES LED TO EQUIVALENT RELIABILITY INDEXES AND THAT THE SAFETY LEVEL OF THE BEAMS, WHICH WERE DESIGNED ACCORDING TO THE BRAZILIAN CODE NBR 6118:2014, IS MAINLY INFLUENCED BY THE LOAD COMBINATION, PRESENTING UNSATISFACTORY VALUES WHEN THE LIVE LOAD INCREASES.
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