The evaluation of fracture parameters by linear and non-linear analysis in size effect of over reinforced concrete beams Aşiri donatili ki̇ri̇şlerde boyut etki̇si̇nde kirilma parametreleri̇ni̇n doǧrusal ve doǧrusal olmayan anali̇zi̇


BELGİN Ç. M. , Şener S.

Journal of the Faculty of Engineering and Architecture of Gazi University, cilt.22, sa.1, ss.149-156, 2007 (SCI Expanded İndekslerine Giren Dergi) identifier

  • Cilt numarası: 22 Konu: 1
  • Basım Tarihi: 2007
  • Dergi Adı: Journal of the Faculty of Engineering and Architecture of Gazi University
  • Sayfa Sayıları: ss.149-156

Özet

The decrease in the nominal failure stress of geometrically similar but different sized members with the increasing characteristic size is called size effect. This effect occurs not only in tension failures but in compression failures as well. This is the case for prestressed concrete members and columns as well. In this study test results of full-scale failure of singly reinforced four-point-bend beams of different sizes containing deformed longitudinal reinforcing bars are reported. A residual stress in brittle specimens are recorded which are modelled and inserted in Bazant's size effect law by using Marquardt-Levenberg algorithm by a short program prepared in Matlab®. Two methods are compared with each other. This study indicates a significant size effect which should be considered in behaviour and design of structures and Bazant's modified size effect law is more successful than the Bazant's former law in greater specimens because of residual stresses.