STRUCTURAL BEHAVIOR OF RC BEAMS CONTAINING A PRE- DIAGONAL TENSION CRACK

Abstract

THIS STUDY FOCUSES THE LIGHT ON THE SHEAR BEHAVIOR OF PRE-CRACKED BEAMS, AND EXAMINES THE FEASIBILITY OF APPLYING FRACTURE MECHANICS CONCEPTS TO WIDEN THE UNDERSTANDING OF SHEAR BEHAVIOR AND MECHANISMS. THE EXPERIMENTAL PROGRAM CONTAINS TEN BEAM SPECIMENS OF HIGH STRENGTH CONCRETE (HSC) AND STEEL FIBER REINFORCED CONCRETE (SFRC). PRE-CRACKS WERE EMBEDDED WITH DIFFERENT SIZES AND LOCATIONS ALONG THE FAVORABLE PATH AND ORIENTATION TO SHEAR FAILURE. THREE MAIN SCENARIOS OF SHEAR FAILURE WERE REPORTED WITH MINUTE EFFECT OF PRE-CRACKS. THE GEOMETRICAL EFFECT IS DOMINANT WITH MARGINAL EFFECT OF THE MATERIAL’S NONLINEARITY IN CASE OF SEVERE PRE-DIAGONAL CRACK IN HSC WHILE THE NONLINEARITY OF THE MATERIAL IS SUPREME TO THAT OF THE GEOMETRICAL EFFECT FOR SFRC AND SHORTER CRACKS. FOR VERIFICATION, NUMERICAL SIMULATION WAS CONDUCTED TO EXAMINE THE GEOMETRICAL EFFECT OF THE PRE-DIAGONAL TENSION CRACK IN SHEAR SPAN ON THE STRUCTURAL BEHAVIOR OF RC BEAMS. IT IS FOUND NUMERICALLY THAT, WHEN THE CRACK TIP OF THE TENSILE CRACK IS AWAY FROM THE TENSILE REINFORCEMENT, THE CLOSURING MOMENT OF TENSILE REINFORCEMENT INCREASES, AND AS A RESULT REDUCES THE STRAIN ENERGY RELEASE RATE. THEREFORE, THE TENSILE CRACKS STOP AND THE SHEAR CRACKS KEEP PROPAGATING LEADING THE FAILURE MECHANISM TO THE END FAILURE POINT.

Author Biography

HOSSAM EL-DIN SALLAM, Jazan University

Professor Hossam El-Din M. Sallam Completed his B.Sc in Civil Engineering at Zagazig University in 1985 and received his M.Sc. and Ph.D. degrees in Materials Engineering from Zagazig University. He was a visiting Ass. Prof. for two years in Northeastern University, Boston, USA. He has served as a Teaching Assistant, Assistant Professor, Associate Professor and full professor in 2004 at Zagazig University. Recently he appointed as Professor at the department of Civil Engineering, Jazan University, KSA. Since 1990 his research has focused on several issues including fatigue, fracture mechanics, failure analysis, repair and strengthening of structures, advanced composite materials, nanocomposites, and special concretes. He taught several under- and post-graduate courses in Civil and Mechanical engineering at several Universities. Prof. Sallam supervised a number of graduate students at Civil and Mechanical Engineering in addition to Dentist Materials (more than 30 theses and greater than 100 scientific papers). Prof. Sallam is a reviewer in several Societies and Publishers such as ACI, RILEM, ICE, KACST, Techno-Press, EJSE, ScienceDirect, Academic Journals, Science Alert. Prof. Sallam is a member in the following Committees: Committee No. 50 for Structural & Construction Engineering, Egyptian Universities Promotion Committees (EUPC), Supreme Council of Universities (SCU). The Examination Committee of the submitted Scientific Production for the State Incentive Awards in Engineering Sciences 2008, General Administration of Awards & Incentives, Academy of Scientific Research & Technology, Egypt.

Published
2018-04-11
Section
Articles

Most read articles by the same author(s)