[PDF] Bond Strength Of Noncontact Tension Lap Splices eBook

Author : Mouhamad Youssef Mansour
Publisher :
Page : 214 pages
File Size : 32,8 MB
Release : 1994
Category : Concrete construction
ISBN :

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A tension lap splice is a common and necessary detail in reinforced concrete construction. A noncontact lap splice also called spaced splice, is a structural detail in reinforced concrete that provides continuity to the reinforcement by overlapping the ends of the steel without the bars touching. The subject of bar spacing in tension lap splices is addressed in the ACI Building Code and Commentary. Section 12.14.2.3 of the code states that "bars spliced by noncontact lap splices in flexural members shall not be spaced transversely farther than one-fifth the required lap splice, nor 6inches". The current provision limiting the spacing of noncontact lap splices was based on experience as well as on limited research performed before 1971. The objective of this study is to perform wider scope research on slab specimens to check the requirements of the ACI Building Code and provide recommendations. Slab specimens were designed to include three bars in tension, spliced at the center of the span. The splice length was selected so that the bars would fail in bond, splitting the concrete cover in the splice region, before reaching the yield point. The slabs were loaded in positive bending with the splice in a constant moment region. The materials used in the experimental program were typical of those used in current construction practices. The main variable was the center-to-center spacings of bars in each splice.

Author : Khouloud Aziz Karam
Publisher :
Page : 216 pages
File Size : 26,84 MB
Release : 2001
Category :
ISBN :

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To meet the objectives, 32 NSC full-scale beam specimens were tested. Each beam was designed with a small splice length (5 times the bar diameter) at midspan to simulate local bond conditions. The design variables were bar size 16, 20, 25, or 32 mm, ratio of bar cover to bar diameter c/db = 0.56, 0.88, 1.0, 1.34, 1.5, 2.0, or 2.1 and the amount of steel fiber reinforcement added in the splice region: Vf = 0.0, 0.5, 1.0, or 2.0 %.--The test results indicated that the use of steel fibers in the splice region increased the bond strength and the ductility of the mode of failure of the beam specimens. These results were combined with other results reported in technical literature and used to develop a model to describe the local bond stress-slip relationship of reinforcing bars embedded in plain and FRC under splitting type failure. The model accounts for all of the important parameters that tend to influence the bond characteristics of reinforcing bars as observed in the experiment.

Author : Alan Williams
Publisher : Dearborn Trade Publishing
Page : 406 pages
File Size : 47,14 MB
Release : 2004
Category : Reinforced concrete construction
ISBN : 9780793185399

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Here is a comprehensive guide and reference to assist civil engineers preparing for the Structural Engineer Examination. It offers 350 pages of text and 70 design problems with complete step-by-step solutions. Topics covered: Materials for Reinforced Concrete; Limit State Principles; Flexure of Reinforced Concrete Beams; Shear and Torsion of Concrete Beams; Bond and Anchorage; Design of Reinforced Concrete Columns; Design of Reinforced Concrete Slabs and Footings; Retaining Walls; and Piled Foundations. An index is provided.

Author : Shadi Sam Najjar
Publisher :
Page : 372 pages
File Size : 18,31 MB
Release : 2001
Category :
ISBN :

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Several studies are reported in the literature on the effect of transverse reinforcement on bond and anchorage characteristics of reinforcing bars in normal and high strength concrete specimens. Transverse reinforcement provides concrete with confinement and increases its tensile resistance against splitting. When used to confine splices, transverse reinforcement leads to an increase in the bond capacity and to a more ductile and gradual mode of failure.--In 2000, a research program was carried out by Joumaa to study the effect of fiber reinforcement on bond strength and mode of failure of tension lap splices in high strength concrete. In this research, the effect of transverse reinforcement on bond strength and mode of failure of tension lap splices in beam specimens similar to those tested by Joumaa, will be investigated.