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International Concrete Abstracts Portal

Showing 1-5 of 12 Abstracts search results

Document: 

SP210-08

Date: 

April 1, 2003

Author(s):

C. Kassem, E. El-Salakawy, and B. Benmokrane

Publication:

Symposium Papers

Volume:

210

Abstract:

This paper presents the test results of 14 full-scale concrete beams. The beams were 3300 mm long with a rectangular cross-section of 200-mm width and 300-mm depth. Twelve beams were reinforced with carbon FRP composite bars and two reinforced with steel as control. Two newly developed types of CFRP bars with different surface textures were considered: the sand-coated ISOROD bars and the ribbed-deformed C-BAR. The beams were tested to failure in four-point bending over a clear span of 2750 mm. The results presented focus on the deflection behaviour of beams reinforced with CFRP bars, which have different bond, elasticity modulus, strain, and strength characteristics. The test results were compared to the predictions of some of the available models (ISIS-M03-01 design manual, ACI 440.1R-01 guidelines, and Razaqpur model). Based on the findings of the study, the validity of the design guidelines and the effectiveness of using the new CFRP bars as reinforcement for concrete beams were established.

DOI:

10.14359/12578

Document: 

SP210

Date: 

February 1, 2003

Author(s):

Editor: NJ Gardner

Publication:

Symposium Papers

Volume:

210

Abstract:

SP-210 This Symposium Publication contains papers presented during the 2002 ACI Spring Convention in Detroit, including six papers related to predicting the deflections of concrete members reinforced with fiber-reinforced polymer (FRP) reinforcement: one paper describes two field investigations, two unique laboratory investigations, a paper on estimating the errors in calculating deflections of high-performance concrete slabs, and a comparison of the ACI and EC2 deflection provisions. This volume should be read in association with Symposium Publication SP-203, Code Provisions for Deflection Control in Concrete.

DOI:

10.14359/14020

Document: 

SP210-09

Date: 

February 1, 2003

Author(s):

A. G. Razaqpur and O. B. Isgor

Publication:

Symposium Papers

Volume:

210

Abstract:

A method is proposed for calculating the deflection of FRP reinforced concete structures based on the integration of moment-curvature relationship. The moment-curvature relationship is assumed to be essentially bilinear with slopes corresponding to the flexural rigidity of the gross and the cracked sections, respectively. The proposed method is used to obtain closed-form solutions for maximum deflection of continuous beams under three common types of loading. The predictions of this method are compared with available experimental data and with the corresponding redictd values by other available methods. The available methods use the concept of effective moment of inertia, similar to the ACI method for conventional reinforced concrete, or some modifications thereof. The predicted values by the proposed method compare better with the experimental results than the effective moment of inertia methods.

DOI:

10.14359/12579

Document: 

SP210-02

Date: 

February 1, 2003

Author(s):

M. A. Polak, K. G. Blackwell, and D. T. Killen

Publication:

Symposium Papers

Volume:

210

Abstract:

The paper presents analysis of results from fourteen full-size tests on reinforced concrete members subject to different ratios of bending and in-plane loads. The tests examined the influence of bond between concrete and reinforcement on the deflections and cracking of the members. The parameters in the test program included reinforcing bar diameter, ratio of in-plane to bending loadings, reinforcement ratio and concrete cover. Two types of specimens were involved: one set with a larger number but smaller diameter bars, and one with a smaller number but larger diameter bars. Since reinforcement sized varied, the bond characteristics of these bars varied, leading to different load-deflection responses. The test results showed that different longitudinal reinforcement configurations, for the same reinforcement ratio and the same loading and boundary conditions, result in different cracking loads, post-cracking stiffness and deflections.

DOI:

10.14359/12572

Document: 

SP210-01

Date: 

February 1, 2003

Author(s):

D. Kaminetzky and P. C. Stivaros

Publication:

Symposium Papers

Volume:

210

Abstract:

Throughout the history of concrete construction, numerous construction failures have occurred involving excessive deflections and cracking of the completed structure. This paper presents two building construction cases where concrete slabs developed extensive cracking and excessive deflections soon after the slab construction and formwork removal. The effects of the shoring-reshoring operations, the rate of concrete strength development, as well as the effects of design details on the slab cracking and deflections, are investigated. The ACI 318 requirements of minimum thickness and deflection control are applied to both construction cases, and the adequacy of these code requirements is discussed. Based on the findings of this work it was concluded that the ACI 318 long term creep and shrinkage deflection calculation method does not adequately account for the early-age high construction loads.

DOI:

10.14359/12571

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