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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
Date:
August 1, 1999
Author(s):
Editors: Charles W. Dolan, Sami H. Rizkalla, and Antonio Nanni
Publication:
Symposium Papers
Volume:
188
Abstract:
SP-188 This volume presents 24 papers from the Fourth International Symposium and represents a significant expansion in the state of knowledge that has occurred since the First Symposium in 1993.
DOI:
10.14359/14223
SP188-86
H. A. Toutanji and M. Saafi
Current design methods for predicting deflections and crack widths at service load in concrete structures reinforced with steel bars may not be necessarily applicable in those reinforced with fiber reinforced polymer (FRP) bars. In this paper, methods for predicting deflections and crack widths and spacing of glass fiber reinforced polymer (GFRP) reinforced concrete beams were proposed. In order to use the effective moment of inertia for concrete beams reinforced with FRP bars, the effect of reinforcement ratios and elastic modulus of the FRP reinforcement were incorporated in Branson’s equation. This paper also presents a new equation to predict crack width. Six concrete beams reinforced with different GFRP reinforcement ratios were tested. Deflections and crack widths were measured and compared with those obtained by the proposed models. The comparison between the experimental results and those predicted was in good agreement.
10.14359/5691
SP188-18
K. Masuo
The objective of this paper is to develop the effective retrofitting method applicable to reinforced concrete columns connected with monolithically cast wing walls by CFRP (Carbon Fiber Reinforced Plastics) sheet jacketing. To clarify the improving mechanism of deformation capacity under earthquake loading by applying CFRP sheet jacketing, eight column specimens with or without wing walls were tested under reversals of horizontal load mainly in the large deformation zone. Test results show that CFRP sheet jacketing methods proposed in this paper are useful for retrofitting works of existing apartment buildings designed in accordance with the old building code. Based on the test evidence, a proposal for estimating the ultimate strength and the deformation capacity of columns with wing walls strengthened by CFRP sheet jacketing are presented.
10.14359/5622
SP188-19
H. Fukuyama, H. Suzuki, and H. Nakamura
In seismic retrofit of existing buildings, there is a great demand that retrofitting work can be done while continuing operations in the building. In order not to disrupt the normal operations in the building, strict limitations on the amount of noise, vibration, dust, and on the use of fire need to be adopted. Since some evaluation methods of retrofitting effects for wrapped RC independent columns with continuous fiber sheets which has an advantage in construction work were proposed, application of this method are dramatically increasing in Japan. However, these evaluation methods can not be applied to the columns with side walls and columns with finishing mortar. When this retrofitting method are applied to these types of columns, finishing is removed and side wall concrete at the boundary portion to the columns is also removed to treat the column with side walls as an independent rectangular column. Then development of the newly effective retrofitting method is necessary to meet the above-mentioned strong demand. This paper reports the test results on the retrofitting effect of RC columns with finishing mortar without removal of finishing and RC columns with side walls without removal of the side wall concrete at the boundary portion. Test results indicates the feasibility of the seismic retrofit of RC columns by fiber sheet wrapping without removal of finishing and side wall concrete.
10.14359/5623
SP188-20
S. Matthys, L. Taerwe, and K. Audenaert
Wrapping of columns by means of FRP (fiber reinforced polymer) reinforcement enhances the structural behaviour of concrete columns considerably. At the Magnel Laboratory for Concrete Research a test programme is set-up to evaluate some specific problems in the modelling of FRP confined concrete, i.e. effective circumferential FRP failure strain and effect of increasing confining action. Parameters studied are FRP type, bonded or unbonded wrapping application, column shape and strengthening lay-out. Both wrapped cylinders and wrapped columns are investigated. An analytical verification of the test results is performed according to different models. From the test results obtained so far, the efficiency of this strengthening technique has been demonstrated, both in terms of structural performance and ease-of-application. Quality of the application (voids, protrusions, etc.) and the wrapping concept (bonded or unbonded, partial wrapping, etc.) influence the strengthening effect.
10.14359/5624
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