Student:	Ertekin ÖZTEKİN
Supervisor:	Assoc. Prof. Dr. Metin HÜSEM
Department:	Civil Engineering
Institution:	Graduate School of Natural and Applied Sciences
University:	Karadeniz Technical University, Turkey

Title of the Thesis:	Investigations of Torsional Behaviour of High Performance Reinforced Concrete Beams Having Different Reinforcement Arrangements Under The Pure Torsion
Level:	M.Sc.
Acceptance Date:	3/7/2007
Number of Pages:	144
Registration Number:	di597

Summary:

Although high performance concrete (HPC) is commonly used, its properties are not

known as much as the properties of ordinary concrete. Indeed, most of equations, rules and

suggestions given in codes used in the design of reinforced concrete and prestressed concrete

structures are developed from the data obtained from experimental studies made on concrete

that have a strenght of less then about 50 MPa. Especially, the reason of the monolotical

structure and non-lineer-elastic behaviour of concrete, the equations used for design, aren’t

convenient for the HPC members.

Most structural members have been affected by torsional effects for the reasons of the

nonsimetrical loadings and structural geometries. Genarally these effects are not effective as

much as the other sectional effects in a member. Torsional resistance are able to increased by

using HPC. But, the main purpose of these study is to investigate of whether torsional

resistance is able to increased or not by using different reinforcement.

The study consists of five chapters. In the first chapter, genereal information is presented.

In second chapter, experimental setup, producing high performance reinforced conrete beams

and torsion mechanism are desciribed. In the third chapter, experimental findings are

presented by graphics and photos, some examines are realized on findings, and a new

approximation is presented to predict torsional moment in this chapter. The conclusions

drawn from the results of this study and suggestions are presented in fourth chaper. This last

chapter is followed by the list of refences.

The conclusions obtained from this study showed that, different reinforcement

arrangements change the behaviour of the HPC in pure torsion. While some arrangements

are change the strength and another some are change the deformation behaviour. Furthermore,

a new formulation is proposed to predict the torsional moment capacity of beams made of

HPC.

Key words : High Performance Concrete, Torsion, Pure Torsion, Torsional Moment,

Reinforcement Arrangement.