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International Concrete Abstracts Portal

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

Document: 

SP180-22

Date: 

October 1, 1998

Author(s):

R. Tepfers

Publication:

Symposium Papers

Volume:

180

Abstract:

The Comite Euro-International du Beton (CEB) has set up under its Commission 2 “Material and Behavior Modelling” a Task Group TG 2/5 “Bond Models” with terms of reference to write a State-of-the-Art report. Chapter 8 in the report will deal with bond of non-metallic reinforcement, FRP. The work has been started using the Japanese State-of-the-Art knowledge presented in [5]. Now research experience is added. The bond concept elaborated for steel rebars is used to interpret the action of the FRP rods/bars. The different bond influencing factors are discussed also for FRP rods/bars. Comparison is performed with steel rebars. The bond of FRP rod/bar depend on more parameters than bond of steel. Variables of interest are form of rod/bar section, type of surface deformations and treatment, modulus of elasticity, Poissons ratio etc. Therefore it is appropriate to use the known bond action of deformed steel rebars in its different stages as a reference, when investigating the bond performance of FRP rods/bars.

DOI:

10.14359/5891

Document: 

SP180-21

Date: 

October 1, 1998

Author(s):

B. S. Hamad and M. S. ltani

Publication:

Symposium Papers

Volume:

180

Abstract:

This paper reports on research in progress conducted at the American University of Beirut to evaluate the effect of silica fume on bond and anchorage of reinforcement in high performance concrete (HPC) structures. The program includes testing the effect of a wide range of variables on the bond strength of beam bar splices and bars anchored in pullout specimens. Results of the first phase of the research program have been analyzed. Ten beam specimens were tested. Each beam was designed to include two bars in tension, spliced at the center of the span. The splice length was selected so that bars would fail in bond, splitting the concrete cover in the splice region, before reaching the yield point. The beams were loaded in positive bending with the splice in a constant moment region. The variables used were the percentage replacement of cement by silica fume and the casting position. Test results indicated that replacement of 5 to 20 percent of the cement by an equal weight of silica fume resulted in an average 8 percent reduction in bond strength regardless of casting position.

DOI:

10.14359/5890

Document: 

SP180-20

Date: 

October 1, 1998

Author(s):

B. Aarup and B. C. Jensen

Publication:

Symposium Papers

Volume:

180

Abstract:

CRC (Compact Reinforced Composite) is a special concept for high performance concretes, where ductility is achieved through incorporation of a large content of short, stiff and strong steel fibres (6 vol.%). This ductility combined with high strength (150-400 MPa) - and the ability of the small fi-bres to provide an effective reinforcement against even small cracks, makes it possible to obtain exceptional bond properties for deformed reinforcing bars. Results show that full anchorage is achieved with an embedment length of only 5-10 diameters for ribbed bars, which has led to applications in buildings, where CRC is used for in-situ cast joints between pre-cast decks -joints which can transfer full moments with a width of 100 mm. This type of joint, which was used for a university building, has been extensively tested for different loading situations and for behaviour in a standard fire. As the fibre reinforced matrix provides a strong, ductile joint which responds well to dynamic loads it is expected to perform well under seismic loads.

DOI:

10.14359/5889

Document: 

SP180-19

Date: 

October 1, 1998

Author(s):

T. Ichinase, T. Hayashi and W. Lin

Publication:

Symposium Papers

Volume:

180

Abstract:

An analytical model is presented to evaluate the local bond-slip relationship in RC lap splices considering the influence of splitting cracks, friction between the concrete and rib face, microscopic fracture of concrete in front of rib face, flexural deformation of the cover concrete, and stirrups. The local bond-slip relationship is integrated along the splice length considering the strain in the concrete in the longitudinal direction. It is shown that the lack of friction at a rib face due to epoxy coating reduces the ductility of the local bond slip relationship without stirrups, resulting in lower splice strengths. The contribution of stirrups to the splice strength is dominated by the flexural strength of the cover concrete with stirrups, and is the function of concrete strength rather than the yield strength of the stirrup.

DOI:

10.14359/5888

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