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International Concrete Abstracts Portal

Showing 1-5 of 15 Abstracts search results

Document: 

SP165-02

Date: 

December 1, 1996

Author(s):

D. Van Gemert

Publication:

Symposium Papers

Volume:

165

Abstract:

Research on the design of adhesive bonding plates for strengthening reinforced concrete structural elements is presented in this paper. Different design aspects are covered, including increase of bending strength, calculation of anchoring length of epoxy bonded steel plates, temperature resistance, dowel action, and strengthening of two-way slabs taking into account orthotropic behavior of strengthened slabs. A brief overview of theoretical principles is given. The results of a large experimental program are evaluated according to the theoretical principles and are translated into practical engineering design procedures. The design procedure for strengthening two-way slabs is explained in a practical example.

DOI:

10.14359/1526


Document: 

SP165-12

Date: 

December 1, 1996

Author(s):

Peter Barlow

Publication:

Symposium Papers

Volume:

165

Abstract:

A specialty contractor must consider many issues prior to deciding to participate in a plate bonding project. The most significant of these issues are feasibility, practicality, and the potential for teamwork between the owner designer, and specialty contractor. Assuming that plate bonding is technically feasible for a specific application, there are still many aspects to consider to insure a seccessful project. Acceptance is an expeditious manner by all parties, coupled with a good understanding of the existing and expected conditions, are critical to the decision. Plate bonding offers many unique advantages that are often realized when repair options are being reviewed. Typically, when this method has been used, it was done so because it was cost effective, minimized down time, did not increase deadload, and had little visual impact on the structure. A series of case histories, including bridges, post-tensioned slabs, and load-bearing walls, highlight the advantages and challenges a contractor may encounter when using this technology. When plate bonding as a repair option is selected early in the design process by all parties involved, then the benefits of a rapid, cost effective, and simple repair process can most readily be realized.

DOI:

10.14359/1559


Document: 

SP165-13

Date: 

December 1, 1996

Author(s):

Hamid Saadatmanesh and Mohammed R. Ehsani

Publication:

Symposium Papers

Volume:

165

Abstract:

The static strength of reinforced concrete (RC) beams strengthened by gluing glass fiber reinforced plastic (GFRP) plates to their tension flanges is experimentally investigated. Five rectangular beams and one T- beam were tested to failure under four-point bending. The measured load versus strain in GFRP plates, steel reinforcing bars, extreme compression fiber of concrete, and the load versus deflection for the section at midspan of the beams are plotted and compared to the predicted values. The results indicate that the flexural strength of RC beams can be significantly increased by gluing GFRP plates to the tension face. In addition, the epoxy- bonded plates improved the cracking behavior of the beams by delaying the formation of visible cracks and reducing crack widths at higher load levels.

DOI:

10.14359/1473


Document: 

SP165-11

Date: 

December 1, 1996

Author(s):

Emo Agneloni

Publication:

Symposium Papers

Volume:

165

Abstract:

This paper shows the application of a new technique called the plate bonding technique to repair damaged structures. The good results obtained show the ability of this technique to solve different structural problems and demonstrated its validity and flexibility from a technical and economic point of view. To have good results, it is necessary to begin with knowledge of the causes of deterioration; therefore, this paper deals with the four main groups of testing methods to analyze these deficiencies. Two examples of research and tests analyzing the applied technique are included which confirm its validity.

DOI:

10.14359/1471


Document: 

SP165-01

Date: 

December 1, 1996

Author(s):

R. Narayan Swamy, Roy Jones, and Abdelhamid Charif

Publication:

Symposium Papers

Volume:

165

Abstract:

Although some test data are available on the behavior of reinforced concrete beams with bonded plates in shear, there is still considerable lack of information on the effectiveness of such plates in resisting shear forces. This paper presents the results of the first stage of a comprehensive study to evaluate the role and mechanism of strengthening in shear when bonded steel plates are used either at the tension face or in the webs. The major variable in this study was the shear span-effective depth ratio, which is the critical parameter for shear failures; two different geometries of web plates were used. The effect of these bonded plates on deformations, cracking, failure loads, and mode of failure are presented and discussed. Bonded plates at the tension face enhanced the flexural stiffness of the original beams which were weak in shear, but their influence in enhancing shear behavior was minimal. Bonded web plates, on the other hand, were very effective in upgrading the structural behavior in shear. However, the latter were unable to reach their full load capacity due to shear cracking in the unreinforced part of the webs and the consequent debonding of the web plates.

DOI:

10.14359/1460


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