Ph.D. Tezi Görüntüleme

Student:	Hakan ÇELİK
Supervisor:	Prof. Dr. Yusuf AYVAZ
Department:	İnşaat Mühendisliği
Institution:	Graduate School of Natural and Applied Sciences
University:	Karadeniz Technical University, Turkey

Title of the Thesis:	STATIC AND DYNAMIC ANALYSES OF MATERIALLY NONLINEAR BEHAVIOR OF REINFORCED CONCRETE BEAMS BY USING OTTOSEN YIELD CRITERION
Level:	Ph.D.
Acceptance Date:	9/6/2010
Number of Pages:	119
Registration Number:	Di774

Summary:

The purpose of this study is to investigate the efficiency of Ottosen criterion, with different tension stress-strain curves and different compression stress-strain curves proposed in the literature for the materially nonlinear analysis of reinforced concrete beams and to use this criterion and stress-strain curves with a finite element method in the static and dynamic analyses of RC beams. For this aim, Ottosen yield criterion, mass matrix for free and forced vibration analysis and Newmark-β method for the time integration are coded in MATLAB and added to a computer program which were written and verified before.

This study consists of four chapters. In the first chapter, after a brief literature review, information about stress-strain curves, yield criteria used in the nonlinear analysis of reinforced concrete structures, the methods of dynamic analysis and Newmark- β procedure are presented and then the purpose and scope of this study are given. In the second chapter, after the plastic material matrix for Ottosen criterion is constructed, the program is verified and the finite element mesh size and the time increment are determined. In the third chapter, the results obtained from static analysis by using Ottosen yield criterion are presented and compared with the experimental and theoretical results given in the literature and also the results obtained from free and forced vibration analysis are presented. In the fourth chapter, the conclusions drawn from the results are presented and recommendations are made. This chapter is followed by a list of references.

It is concluded that the load-displacement curves obtained by using Ottosen criterion are in good agreement with the experimental and theoretical results given in the literature. It is also concluded that the criterion used in this study can be effectively used in the nonlinear static and dynamic analyses of reinforced concrete beams.

Keywords: Reinforced concrete, Nonlinear Analysis, Static Analysis, Dynamic Analysis, Ottosen Criterion, Stress-Strain Curves