ACI Global Home Middle East Region Portal Western Europe Region Portal
Email Address is required Invalid Email Address
In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Learn More
Become an ACI Member
Topics In Concrete
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:
SP188-86
Date:
August 1, 1999
Author(s):
H. A. Toutanji and M. Saafi
Publication:
Symposium Papers
Volume:
188
Abstract:
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.
DOI:
10.14359/5691
SP188-80
R. L. Hutchinson and S. H. Rizkalla
This paper summarizes research findings on the use of carbon fibre reinforced polymer (CFRP) sheets for shear strengthening of pretensioned AASHTO bridge girders. The research includes an experimental program conducted at the University of Manitoba using scale models of pretensioned concrete girders in composite action with the deck slab. Seven ten meter long beams were strengthened with three different types of CFRP sheets using ten different configurations and were tested to failure at each end. The paper describes the experimental program, test results, failure mechanisms and the effectiveness of each configuration of CFRP sheets. A rational model is introduced to define the contribution of the CFRP sheets to the shear resistance in addition to the contributions provided by the stirrups and the concrete for I-shaped pretensioned concrete members. Test results are used to verify the proposed model.
10.14359/5692
SP188
Editors: Charles W. Dolan, Sami H. Rizkalla, and Antonio Nanni
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.
10.14359/14223
SP188-26
O. S. Marshall, Jr., S. C. Sweeney, and J. C. Trovillion
The U.S. Army Construction Engineering Research Laboratory, in partnership with the Composites Institute of the Society of Plastics Industry, Inc. and in support of the Army’s facility seismic rehabilitation efforts, is investigating the applicability of fiber reinforced polymer (FRP) composite materials systems to strengthen unreinforced masonry (URM) walls. The end product of the research will be the design guidance and construction specifications necessary for the Army to use these materials systems. Much of the Army’s inventory of facilities is constructed of masonry bearing walls. The masonry walls of these facilities are usually either lightly reinforced or unreinforced. This structural system has been shown to perform poorly in past earthquakes and requires upgrading to ensure safety and mission operation during and after an earthquake. This research will develop procedures for the rehabilitation and/or upgrade of masonry walls using typical advanced composite materials systems. New 4-ft by 4-ft double wythe brick wall panels with FRP composite reinforcing applied to one face were constructed and will be tested. The shear performance of different widths and thicknesses of FRP composite applied across brick mortar joints of brick triplets, three brick high prisms with the center brick offset by half an inch, was also tested. Using FRP composites for seismic rehabilitation of URM walls show great potential. Triplet tests showed consistent strengthening of the mortar joints as a function of the width of the FRP composite overlay. With multiple layers of FRP applied, the shear strength of the mortar joints increased sufficiently to cause failure to occur via brick compression failures instead of via shear failure at the mortar joints.
10.14359/5630
SP188-27
D. Davis and M. L. Porter
This paper suggests an approach to the design of glass fiber reinforced polymer dowels (GFRP) for transverse joints of highway pavement slabs. It also discusses some of the research being conducted at Iowa State University to confirm this procedure. Preliminary results from this research indicate that the GFRP dowel bars appear to be a feasible solution to the deterioration of the transverse joints of highway pavement slabs as long as the diameter of the dowel is increased, spacing decreased, or a combination of both. This adjustment is necessary in order to keep the deflection of the joint and thus the flexural stresses in the concrete equivalent to those experienced by their steel counterparts.
10.14359/5631
Results Per Page 5 10 15 20 25 50 100
Edit Module Settings to define Page Content Reviewer