RECOMMENDATION OF DEFLECTION CALCULATION FOR A REINFORCED CONCRETE BEAM SUBJECTED TO SHORT-TERM LOADS ACCORDING TO VIETNAMESE STANDARD TCVN 5574:2018: A COMPARISON WITH FINITE ELEMENT MODELING

Abstract

This study focuses on evaluating short-term deflections of reinforced concrete beams according to the Vietnamese Standard on the Design of Concrete and Reinforced Concrete Structures (TCVN 5574:2018) by comparing them with simulated results obtained from Abaqus software. The aim is to propose recommendations to enhance safety in calculating deflections according to TCVN 5574:2018. The Concrete Damaged Plasticity model is defined in the Abaqus software to account for complex behaviors of concrete, while in the TCVN 5574:2018, bilinear or trilinear stress-strain curves are used to facilitate practical calculations. It is found that values of deflections calculated according to TCVN 5574:2018 could be underestimated during the non-cracking stage of concrete and overestimated at higher levels of loads before reaching the yielding point of steel with differences varied between 15% and 20%. By comparing results from practical standards and complex simulations, this research contributes to the enhancement of design methodologies and structural safety.