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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 23 Abstracts search results
Document:
SP180
Date:
October 1, 1998
Author(s):
Editor: Roberto Leon
Publication:
Symposium Papers
Volume:
180
Abstract:
SP-180 During the ACI 1997 Spring Convention, ACI Committee 408, Bond and Development of Reinforcement, organized four sessions intending to assess the state of the art in bond research, practical applications, and code development. The sessions were organized into a symposium honoring Dr. Peter Gergely, a longtime member of Committee 408, who had recently passed away.
DOI:
10.14359/14173
SP180-15
E. Vintzileou and N. Psilla
This paper presents the results of an experimental investigation on the anchorage of deformed steel bars embedded in bed joints of masonry. The effect of bar diameter, anchorage length and vertical load on the mortar joint is investigated. Although the horizontal bars in masonry are under unfavourable conditions, such as low strength of mortar, small cover values, lack of bond at places where the bars pass over large holes of the masonry unit, tests have proved that embedment lengths as low as 30 to 40 times the bar diameter seem to be sufficient for the bars to develop their yield strength.
10.14359/5884
SP180-07
J. A. den Uijl
From pull-out and push-in tests on specimens with short embedment length an empirical relation has been derived, which describes the local bond stress as a function of the local slip and steel stress change. With the help of this bond model the transfer length and the bi-linear relationship for the development length of a pretensioned strand (ACI Building Code 1989, CEB-FIP Model Code 1990) is simulated. It is also used to indicate the influence of strand yielding on the development length. For the estimation of the concrete cover and strand spacing required to prevent the occurrence of visible bond splitting cracks the response of the concrete to the radial displacement of the strand-to-concrete interface is analyzed by means of a so-called thick-walled-cylinder model. The radial interface displacement consists of transverse deformation of the strand coupled with steel stress change (Poisson effect) and wedging action caused by the shape of the strand (lack-of-fit effect) and surface roughness. Besides the section geometry, this model takes into account the softening behaviour of concrete loaded in tension. It is used to explain the influence of various parameters such as concrete cover, strand spacing, strand diameter and concrete strength on the bond properties of strand.
10.14359/5876
SP180-16
R. A. DeVries, J. O. Jirsa and T. Bashandy
Pullout tests were conducted on deeply embedded headed reinforcement to determine the effect of transverse reinforcement and bonded length on the side-blowout capacity and load-slip behavior of the anchorage. It was found that transverse ties or stirrups in the anchorage zone had little effect on the ultimate capacity. Increases in anchorage capacity were only observed when the head was positively anchored in contact behind a large crossing bar. Transverse reinforcement also had little effect on the load-slip behavior before failure. However, when large amounts of transverse reinforcement were placed near the head, the amount of load maintained after the blowout failure occurred was increased. Additional bonded length of a deformed reinforcing bar increased the anchorage capacity and reduced the head slip for a given load. The amount of increase in capacity can be predicted using current ACI provisions for development length. Design procedures taking into account the effects of transverse reinforcement and bonded length were developed.
10.14359/5885
SP180-08
E. Giuriani and G. A. Plizzari
In the present paper, the role of the confining forces both on bond capacity and on splitting crack opening under service loads is shown. In par-ticular, theoretical relationships between the transverse reinforcement area, the bond strength, the splitting crack opening and the stirrup stress are pre-sented. The theoretical predictions are contrasted with some experimental results and a discussion on the values provided by building codes is presented. The results show the strong influence of transverse reinforcement whose confining force is expressed by the stirrup index of confinement, which gov-erns bond behavior and is suitable for design. The comparison with several experimental results showed a good agreement between theory and tests. Adequate values of Q are also required to control splitting crack opening under service loads. For common amounts of transverse reinforcement, the splitting crack opening can be larger than one half of the flexural crack, which could be unacceptable for structural durability.
10.14359/5877
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