Determination of Pull Out Capacity of Steel Bar in Concrete

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CHAPTER 1

INTRODUCTION

1.1 Introduction of Research

Steel-reinforced concrete is a widely used structural material. The effectiveness of the steel reinforcement depends on the bond between the steel reinforcing bar and the concrete. Reinforced concrete is a composite material in which concrete 's relatively low tensile strength and ductility are counteracted by the inclusion of reinforcement having higher tensile strength and ductility. The reinforcement is usually, though not necessarily, steel reinforcing bars and is usually embedded passively in the concrete before it sets. Reinforcing schemes are generally designed to resist tensile stresses in particular regions of the concrete that might cause unacceptable cracking and
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It was found that up to a certain degree of rust, the bond was not significantly reduced and the specifications were relaxed. These specifications now recognize that slightly rusted steel reinforcing bar does not cause a significant reduction in the bond stress and allows contractors to use this reinforcing bar without having to first remove the rust. This saves the contractor considerable time and money without significantly affecting the quality and strength of the reinforcing concrete structure.

1.2 Research Background

The main purpose of this research was carried out to determine of pulled out capacity of steel reinforcing bar embedded in concrete. There are tree parameters to study about which are development length of embedded in concrete that suitable for different concrete strength and different types of bars is measure with different roughness surface of bar. Meanwhile, the compressive strength of concrete was internally to generate the strength capacity of steel bar.

First, the purpose of research is to reinforcing bars must be embedded a minimum distance into the concrete in order to achieve the full tensile capacity, T of the bar. This length is referred to as Development Length; Ld. The development length is based upon the bond between the rebar and the concrete. Factors affecting this bond include the type of ribbing on the bar, concrete quality and distance between bar

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