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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 97 Abstracts search results
Document:
SP188-96
Date:
August 1, 1999
Author(s):
V. M. Karbhari, F. Seible, W. Seim, and A. Vasquez
Publication:
Symposium Papers
Volume:
188
Abstract:
Upgrading often becomes a necessity due to changes in usage of buildings due to factors such as deterioration and aging, change in occupancy, or the need for installation of facilities such as air-conditioning, heating, escalators, elevators, additional skylights, or new façade structures. In a number of cases upgrading is related to changes which affect the load bearing components of the structure. Fiber reinforced polymer matrix composites provide an efficient means of both strengthening slabs for enhanced load carrying capacity and for strengthening slabs after installation of cut-outs. This paper reports on a series of tests conducted to assess the comparative efficiencies of a commercially available strip form and a fabric form of material vis-à-vis strengthening ability and ductility. It is shown that material tailoring can result in significant changes in efficiencies. The extension of this to the rehabilitation of cut-outs is also detailed and aspects of an on-going full-scale test program in that area are elucidated.
DOI:
10.14359/5703
SP188-73
M. Khin, M. Tanaka, K. Venkataramana, and T. Harada
In this paper, an experimental study on the frictional coefficient of fiber reinforced polymer (FRP) tendons is made and reported. Tests on FRP tendons fixed in cement mortar and confined with highly expansive material (HEM), and placed all together inside a steel sleeve pull-out test were conducted. Tests were carried out at various levels of confining pressure. The initial bond and the friction coefficient are presented for the FRP tendon with the surrounding HEM. A newly developed pressure transducer was placed in the same manner as the FRP tendon to monitor the confining pressure due to the HEM. The previous results are compared with the present one on Carbon FRP are reported using this monitoring system. The Vinyl on FRP is tested for the first time and the large size Carbon FRP are also introduced as they are prime candidates for use in practice.
10.14359/5677
SP188-74
H. Katsumata, K. Kobayashi, S. Morita, and Y. Matsuzaki
Since the 1995 Hansin Earthquake, need of seismic retrofitting of existing structures has been strongly understood. Being expected to reduce inconvenience in retrofit work of buildings, some techniques using carbon and/or aramid fibers have been widely employed in Japan due to light weight, flexibility, non-welding, and easy handling. Many of these techniques aim to improve shear capacity and ductility of existing reinforced concrete columns and may be called “Standard Method” due to the almost common working procedure. The procedure includes (1) wrapping columns in the transverse direction using continuous fiber sheets, (2) impregnating epoxy resin into the sheets to make FRP composite, and (3) doing surface treatment or arrangement of concrete to prevent voids or wrinkles. This “Standard Method” of fiber wrapping has induced development of other methods that improve a working process or can be applied for other structural members. In the future, the fiber wrapping technique will be more spread, however, it requires an approved and common quality control method. An education program for retrofit engineers and craftsmen should be also established.
10.14359/5678
SP188-07
K. Neocleous, K. Pilakoutas, and P. Waldron
Design guidelines for reinforced concrete structures (RC) with fibre reinforced polymers (FRP) use the concept of partial safety factors to ensure that structural safety is attained. However, when partial safety factors are used for the design of FRP RC structures, the structural reliability levels are not known. It is very important that structural reliability targets are met, in particular when there is a change in the predominant mode of failure. Furthermore, the resistance-capacity margins between various failure modes are not known. The work reported in this paper investigates these safety-related uncertainties. The notional structural reliability levels of two FRP RC beams are evaluated for the flexural and shear failure mode. The resistance-capacity margins for these two failure modes are also evaluated. Finally, the effect of the partial safety factors on the type of the expected failure mode is investigated.
10.14359/5679
SP188-08
R. S. Engel, M. G. Croyle, C. E. Bakis, and A. Nanni
The goal of this research is to evaluate the immediate deflections of concrete beams reinforced by carbon FRP grids with various fiber placement designs. Manufacturing and testing various FRP grid designs are the first steps toward the long-term goal of developing FRP reinforcement with optimized strength and serviceability performance. Four grid designs with stiffnesses that ranged from 47.1 kN/mm to 33.6 kN/mm, as determined from stand-alone tensile tests, were used as reinforcement in concrete beams and tested in flexure via three-point loading. The flexural results are in good agreement with the deflections as determined from a modified version of the ACI 318 flexure equations.
10.14359/5680
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