ANALYSIS OF THE STEEL BRACED FRAMES EQUIPPED WITH ADAS DEVICES UNDER THE FAR FIELD RECORDS

Abstract

THE USEFULNESS OF SUPPLEMENTARY ENERGY DISSIPATION DEVICES IS NOW QUITE WELL-KNOWN IN THE EARTHQUAKE STRUCTURAL ENGINEERING FOR REDUCING THE EARTHQUAKE-INDUCED RESPONSE OF STRUCTURAL SYSTEMS. THE SEISMIC BEHAVIOR OF STRUCTURES WITH SUPPLEMENTAL ADAS DEVICES IS CONCERNED IN THIS STUDY. IN THIS PAPER, THE RATIO OF THE HYSTERETIC ENERGY TO INPUT ENERGY IS COMPARED IN DIFFERENT STRUCTURAL SYSTEMS. THE MAIN PURPOSE OF THIS PAPER IS TO EVALUATE THE BEHAVIOR OF STRUCTURES EQUIPPED WITH YIELDING DAMPERS (ADAS), LOCATED IN FAR FIELDS BASED ON ENERGY CONCEPTS. IN ORDER TO OPTIMIZE THEIR SEISMIC BEHAVIOR, THE CODES AND SOLUTIONS ARE ALSO PRESENTED. THREE CASES INCLUDING FIVE, TEN AND FIFTEEN–STORY THREE-BAY CONCENTRIC BRACED FRAMES (CBF) WITH AND WITHOUT ADAS WERE SELECTED. THE PERFORM 3D.V4 SOFTWARE ALONG WITH THREE EARTHQUAKE RECORDS (NORTHRIDGE, IMPERIAL VALLEY AND TABAS) IS USED FOR NONLINEAR TIME HISTORY ANALYSIS AND THE CONCLUSIONS ARE DRAWN UPON ENERGY CRITERION. THE EFFECT OF PGA VARIATION AND HEIGHT OF THE FRAMES ARE ALSO CONSIDERED IN THE STUDY. FINALLY, TO INCREASE THE ENERGY DAMPING ABILITY AND REDUCE THE DESTRUCTIVE EFFECTS IN STRUCTURES ON AN EARTHQUAKE EVENT, SO THAT A GREAT AMOUNT OF INDUCED ENERGY IS DAMPED AND DESTRUCTION OF THE STRUCTURE IS PREVENTED AS MUCH AS POSSIBLE BY USING ADAS DAMPERS.