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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 12 Abstracts search results
Document:
SP264
Date:
October 1, 2009
Author(s):
Editors: Carlos Ospina, Peter Bischoff, and Tarek Alkhrdaji / Sponsored by: ACI Committee 440
Publication:
Symposium Papers
Volume:
264
Abstract:
This CD-ROM consists of 11 papers that were presented by ACI Committee 440 at the ACI Spring 2009 Convention in San Antonio, TX, in March 2009. The papers focus on experimental evaluation and analytical predictions related to deflection and cracking. Note: The individual papers are also available. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP-264
DOI:
10.14359/51663287
SP264-09
Y.J. Kim
This paper presents detailed investigations into the effective moment of inertia for concrete beams prestressed with aramid fiber reinforced polymer (AFRP) tendons, including an assessment of the existing predictive methods. A three-dimensional nonlinear finite element analysis (FEA) model is developed, based on three different experimental programs reported in literature, to predict the effective moment of inertia of concrete beams prestressed with AFRP tendons. The investigation includes the effect of different sectional properties and various prestressing levels in the tendons. The solved FEA models are compared with several predictive models. The prestressing level in the AFRP tendons significantly influences the transition of the moment of inertia from uncracked section (Ig) to fully-cracked section (Icr) . The existing design standards may not be applicable for beams having a large Ig/Icr ratio (typically over 50) with a low level of prestress (e.g., below 40% ultimate).
10.14359/51663265
SP264-06
S. Matthys and L. Taerwe
To understand and predict the effect of externally bonded reinforcement (EBR) on the serviceability behavior of FRP (fiber-reinforced polymer) strengthened members, four-point bending tests have been executed on reinforced concrete (RC) beams with span length 3.8 m (150 in.). This experimental campaign was further complemented with tests on strengthened tensile members. These so-called ‘tension stiffening’ tests typically consist of a tensile test on a reinforcing bar embedded in a FRP strengthened concrete prism. As the FRP EBR increases the stiffness of the beams and as a denser crack pattern with smaller crack widths is obtained, the serviceability limit state (SLS) of the strengthened members is positively influenced. Hereby, the behavior in terms of deflection and crack widths can be predicted in a fairly accurate way.
10.14359/51663262
SP264-11
J.J. Kim, A.M. Said, and M.M. Reda Taha
This paper presents an alternative approach to examine uncertainty in predicting deflections of fiber-reinforced polymer-reinforced concrete (FRP-RC) beams. The use of nonspecificity of concrete cracking as a measure of cracking variability is proposed. Non-specificity is a type of uncertainty associated with having multiple alternatives to define variables (e.g. modulus of rupture, tensile strength to describe cracking). Nonspecificity in cracking can be described by considering cracking strength interval. Using a cracking strength interval, deflection intervals of FRP-RC beams are calculated. Deflection is modeled using cracked plane frame analysis integrated with recent models describing concrete tension stiffening with fiber reinforced polymers (FRP) reinforcement. A deflection database of FRP-RC beams is developed and examined. The uncertainty in deflection prediction is evaluated by comparing the measured deflection from the database with respect to the predicted deflection interval. The significance of deflection prediction parameters on the uncertainty in predicting deflection of FRP-RC beams was analyzed. It is shown that when the applied moment to cracking moment ratio gets close to unity, the uncertainty in predicting deflection of concrete beams reinforced with FRP increases.
10.14359/51663267
SP264-01
A. Scanlon
Design for deflection control is a critical part of the design of FRP reinforced members due to the relatively low modulus of elasticity and elastic-brittle nature of FRP reinforcement. This paper provides an overview of design for deflection control including a brief review of the basic mechanics of beam flexure and a review of methods to account for cracking, tension stiffening, shrinkage and creep. The basis for selecting appropriate deflection control criteria is also discussed and a framework is presented to incorporate deflection control into the overall design process.
10.14359/51663257
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