NUMERICAL INVESTIGATION OF TENSION REINFORCEMENT LAP LENGTH OF EUROCODE 2 USING A FOUR-POINT BEAM LOADING SYSTEM
NORMALLY REINFORCED CONCRETE BEAM, USING ANSYS WORKBENCH SIMULATION SOFTWARE PROGRAM BY SIMULATING A LABORATORY 4-POINT BEAM LOADING TEST SYSTEM UNDER STATIC LOADING. A TYPICAL 4-POINT LABORATORY SETUP LOADING SYSTEM WAS MODELLED USING AN INNOVATIVE AND SUSTAINABLE FINITE ELEMENT ANALYSIS (FEA) APPROACH. IN ORDER TO INVESTIGATE THE EC2 TENSION LAP LENGTHS (LO) DESIGN RECOMMENDATION, A TOTAL OF 100 ANALYSIS CASES OF LAP LENGTHS WERE CONSIDERED FOR DIFFERENT REINFORCEMENT BAR DIAMETERS OF 10MM, 12MM, 16MM, 20MM AND 25MM. THE STUDY HAS CONSIDERED BEAM FAILURE TYPES, EFFECTS OF FAILURE LOAD ON THE VARIOUS LAP LENGTH REDUCTION CASES AND EFFECTS OF STEEL REINFORCEMENT BAR SIZE CHANGES ON THE DESIGN LAP LENGTHS. THE ANALYSIS OF RESULTS REVEALED THAT THE YIELD STRENGTH OF STEEL (FYK), DIAMETER OF TENSION REINFORCEMENT BAR, (DB), TENSILE STRENGTH OF CONCRETE (FCTD) AND CONCRETE COVER (CD) ARE THE MAIN PARAMETERS FOR A TENSION LAP LENGTH DESIGN ACCORDING TO EC2. WHILE A LINEAR RELATIONSHIP EXISTS BETWEEN TENSION STEEL REINFORCEMENT BAR SIZES (DB) AND THE OBTAINED LAP LENGTHS (LO). THE STUDY REVEALS A POTENTIAL USE OF 15% AND 20% REDUCTION IN LAP LENGTH (LO) FOR TENSION STEEL REINFORCEMENT BAR SIZES OF 10MM,16MM AND 12MM AND 20MM IN COMPARISON WITH THE RECOMMENDED DESIGN LAP LENGTH OF EC2. IT WAS CONCLUDED THAT EC2 TENSION LAP LENGTH DESIGN RECOMMENDATION IS CONSERVATIVE.
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