EFFECTS OF CFRP RETROFIT ON IMPACT RESPONSE OF SHEAR-DEFICIENT SCALED REINFORCED CONCRETE BEAMS

Authors

  • MOHAMMAD ZAMAN KABIR DEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING
  • ERFAN SHAFEI DEPT. OF CIVIL ENGINEERING, AMIR KABIR UNIVERSITY OF TECHNOLOGY

Keywords:

REINFORCED CONCRETE BEAM, SHEAR FAILURE, LOW-VELOCITY IMPACT, CFRP

Abstract

AN EXPERIMENTAL PROCEDURE IS CARRIED OUT TO INVESTIGATE RESPONSE FEATURES OF SEMI-DEEP REINFORCED CONCRETE (RC) BEAMS WITH DOMINANT STATIC SHEAR FAILURE SUBJECTED TO LOW-VELOCITY IMPACT DYNAMIC LOAD BOTH IN INTACT AND RETROFITTED CASES. BUILT SPECIMENS HAVE SCALED GEOMETRY AND MATERIAL PROPERTIES PRESERVING PHYSICAL SIMILARITY WITH FULL-SCALE MEMBERS AND ARE STRENGTHENED USING EXTERNALLY BONDED CARBON FIBER REINFORCED POLYMER (CFRP) SHEETS. CONDUCTED TESTS GATHER RELIABLE AND ROBUST DATA REVEALING NOTABLE STIFFNESS AND STRENGTH RECOVERY WITHIN SKIN ATTACHMENT. DESIRED PERFORMANCE CRITERION IS DETECTED HERE AS CONCRETE FLEXURAL CRACKING ALONG SPAN ONLY WHEN BRITTLE SHEAR COLLAPSE IS PREVENTED. PEAK ABSORBED IMPULSE CAPACITY IS ATTAINED FOR UNIDIRECTIONAL CARBON FIBER RETROFIT. STIFFNESS IS RECOVERED INITIALLY DURING FIRST IMPACTS AND THEN STARTS DEGRADING DUE TO RUPTURE OF HORIZONTAL FIBERS IN CROSS-PLY RETROFIT, BUT PROVIDED STIFFNESS IS STABLE FOR UNIDIRECTIONAL RETROFIT DURING ALL IMPACTS.

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Published

2015-01-22

Issue

Vol 12, No 01 (2015)

Section

Articles

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