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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 41 Abstracts search results
Document:
CI4607Klinger
Date:
July 1, 2024
Author(s):
James E. Klinger, Eamonn F. Connolly, Charles D. Charlson, Oscar R. Antommattei, and Bruce A. Suprenant
Publication:
Concrete International
Volume:
46
Issue:
7
Abstract:
Various codes, specifications, and reports provide different requirements/recommendations for anchor bolt (rod) installation in foundations. The article discusses the issues related to these requirements/recommendations and encourages designers to add 2 in. (50 mm) to the calculated design embedment length and to specify the elevation of the top of the anchor bolt.
SP296-02
March 6, 2014
Donald F. Meinheit, Andrew E. N. Osborn, and Mark R. Krueger
Symposium Papers
296
Hooked-shaped anchor bolts are a time-honored, commonly used anchor to attach steel column base plates, light poles, wood sill plates, and other structural attachments to concrete foundations. They are typically known as J- or L-bolts and have lost some popularity with the availability of post-installed anchors. Generally, the anchor is a bent bar, smooth or deformed with threads on one end and a hook on the other end. J- or L-bolts are inexpensive and easily manufactured out of straight or coiled bars. When used to attach and anchor steel columns there is often little need to consider uplift tension loading on the anchors. The usual loading is a shear load where strength of the anchor depends on how far the anchors are from the free edge of the concrete. However, for sign posts, hooked anchor bolts are required to carry tension loading due to overturning bending moments from lateral wind loading. This paper reviews the behavior of hooked anchors bolts and proposes design expressions for tension loading.
DOI:
10.14359/51686875
SP283-16
March 1, 2012
J. Iketani, H. Tsukagoshi, and M. Kawakami
283
Adhering carbon fiber (CF) sheets onto RC piers is one of the effective seismic strengthening methods. When the pier has an irregular shape such as I-shaped cross section, CF sheets cannot be adhered continuously around the pier. In such cases, the edge of the CF sheets have to be fixed with steel angles and anchor bolts in conventional fixing method. Therefore, an alternative fixing method using CF-anchors consisted of bundles of CF strands and fan shaped was developed and practically applied. One end of the CF-anchor spreaded like a fan was adhered to the CF sheet and other end is embedded in a hole drilled in the concrete member and fixed with injected epoxy resin. Applying this CF-anchor for the reinforcement of the concrete piers, it is necessary to design the adhesive load of the adhered part and the pull-out load of the embedded CF-anchor corresponding to the amount of the CF sheets. This paper describes the design of CF-anchors based on the experimental results for the adhesive load of the adhered part and the pull-out load of the embedded CF-anchor.
10.14359/51683772
SP275-67
March 1, 2011
Vicki L. Brown, Andrew Dinh, and Giovanna Iacono
275
The behavior of seventeen RC beams strengthened with FRP laminates mechanically fastened to their tension soffits with concrete anchor bolts is presented. The beams were tested in four-point bending on a 7.5 foot (2286 mm) span. Bolt diameter and spacing and FRP strip length were varied. The beams exhibited increases in yield moment ranging from 12.5% to 46%, and increases in ultimate moment from 30% to 75%, while displacement ductility ratios were 75% of values from un-strengthened control beams. The number of fasteners in the shear span had a greater impact on ultimate strength than did FRP strip length. Terminating the FRP strips in regions of larger bending moment resulted in an unexpected change of failure mode from concrete compression to shear. Measured strains in the FRP were less than those calculated assuming fully bonded conditions.
10.14359/51682477
SP275-48
Vicki L. Brown, Lawrence C. Bank, Dushyant Arora, David T. Borowicz, Ahmed Godat, Anthony J. Lamanna, Jaeha Lee, Fabio Matta, Annalisa Napoli, and Kiang Hwee Tan
A method for strengthening reinforced concrete members using mechanically-fastened FRP (MF-FRP) has been studied in laboratory investigations and in several bridge strengthening demonstration projects. The strengthening is obtained by attaching FRP strips, with high bearing and longitudinal strengths, to concrete elements using steel power actuated fastening “pins” (PAFs), steel anchor bolts or concrete screws, or a combination thereof. The MF-FRP method requires minimal surface preparation and permits immediate use of the strengthened structure. Published research on this method with a range of member sizes has shown promising results in terms of installation efficiency, level of strengthening achieved, and preventing strip delamination before concrete crushing. This State-of-the-Art paper presents an overview of work conducted over the last 10 years on experimental aspects of the MF-FRP method, with beams as well as one-way and two-way slabs. A database of collected test results for MF-FRP strengthened beams and one-way slabs is presented.
10.14359/51682458
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