EXPERIMENTAL AND NUMERICAL MODELING OF HORIZONTALLY-BENT BURIED PIPELINES CROSSING FAULT SLIP

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SAHAND SARIOLETLAGH FARD
MASOUD NEKOOEI
ASGHAR VATANI OSKOUEI
ARMIN AZIMINEJAD

Abstract

THE BEHAVIOR AND RESPONSE OF PIPELINES SUBJECTED TO SLIP FAULT MOVEMENT IS STUDIED BY NUMERICAL SIMULATIONS AS WELL AS EXPERIMENTAL SETUP. A FINITE ELEMENT MODELING IS ALSO DEVELOPED VIA ABAQUS SOFTWARE. IN THIS STUDY, AN ARTIFICIAL ACCELEROGRAM IS APPLIED TO THE SYSTEM AND MATCHED AGAINST THE RESPONSE SPECTRUM ACCORDING TO THE STANDARD NO. 2800 (IRANIAN CODE OF PRACTICE FOR SEISMIC RESISTANT DESIGN OF BUILDINGS). THREE DIFFERENT PIPE NOMINAL SIZES AND THICKNESSES (1 ½", 2" AND 4") ARE CONSIDERED IN THE EXPERIMENTS ON THE SHAKING TABLE. ACCORDING TO THE RESULTS, PLASTIC HINGE AS WELL AS THE EXTREMUM STRESS AND STRAIN IS FORMED IN THE FIXED SOIL WEDGE AND AT LOCATIONS CLOSE TO THE FAULT LINE. FURTHER, AS THE PIPE D/T RATIO INCREASES, THE PLASTIC HINGE FORMS FURTHER AWAY FROM THE FAULT LINE. ACCORDING TO THE RESULTS, THE PIPE-SOIL STRAIN RATIO (ΕP/S) HAS LOWER VALUES AT LARGER PIPE DIAMETERS. ALSO, THE AXIAL STRAINS WOULD BE GREATER FOR THE SYSTEMS WITH HIGHER (ΕP/S) RATIOS.

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