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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 82 Abstracts search results
Document:
24-465
Date:
September 11, 2025
Author(s):
Jahanzaib and Shamim A. Sheikh
Publication:
Structural Journal
Abstract:
The paper presents a comparative study on the seismic behavior of circular columns reinforced with glass fiber-reinforced polymer (GFRP) and steel. The study specifically investigates the influence of replacing steel bars with GFRP bars on columns’ seismic response. All the studies summarized in this article were conducted at the University of Toronto. Results from the tests of 24 columns (all having 356 mm diameter and tested in a similar manner) from three different studies are closely analyzed to compare their responses. Based on the experimental results, it is found that replacing steel spirals with GFRP spirals did not result in substantial variation in the seismic performance of columns. Both types demonstrated similar ductility parameters and drift ratios when similar amounts of spirals were used at comparable pitches. Likewise, columns with steel longitudinal reinforcement and GFRP longitudinal reinforcement achieved similar displacement ductility, energy dissipation, and drift ratio.
DOI:
10.14359/51749173
24-041
September 1, 2025
Gustavo J. Parra-Montesinos and Jacob Zeuske
Volume:
122
Issue:
5
Two large-scale exterior beam-column connections with beam longitudinal headed bars were tested to evaluate their susceptibility to breakout failures. The specimens were designed following the strength and transverse reinforcement detailing provisions in Chapter 15 of ACI 318-19. The variable investigated was the headed bar embedment length, which was determined based on either Chapter 25 of ACI 318-19 or recent research at The University of Kansas, the latter leading to a 22% shorter embedment length. Both specimens exhibited beam flexural yielding, but the specimen with the shorter bar embedment length experienced significantly more connection damage, followed by a concrete breakout failure. Based on the limited test results, it is recommended that nominal joint shear strength be calculated based on a joint effective depth equal to the headed bar embedment length and a shear stress of 1.0λ√fc' MPa (12λ√fc' psi). A method for calculating headed bar group anchorage strength in exterior beam-column connections was proposed, which led to reasonable and conservative strength estimates in the test specimens.
10.14359/51746793
24-372
July 1, 2025
Ariel A. Suselo, Wassim M. Ghannoum, and Adolfo B. Matamoros
4
This paper presents important revisions to the shear strength provisions for seismic assessment of reinforced concrete columns in ACI CODE-369.1-22. A new formulation based on a strut-and-tie model is introduced to expand the range of application of existing provisions to include columns with shear span-depth ratios lower than 2. Revisions are proposed to the slender column provisions to improve their precision, reduce estimate bias, and eliminate instances where they produce unconservative estimates of shear strength. The proposed relations were calibrated using shear strength data from 94 shear-critical rectangular columns subjected to load reversals from a database developed at The University of Texas at San Antonio.
10.14359/51745487
22-242
May 1, 2023
Brock D. Hedegaard, Timothy J. Clement, and Mija H. Hubler
Materials Journal
120
3
A new semi-empirical concrete shrinkage and creep model called the CPRH Model is proposed and calibrated. The new model proposes a coupling between autogenous and drying shrinkage using a volume-average pore relative humidity and treats drying creep as an additional stress-dependent shrinkage, linking together all these phenomena. The proposed expressions are designed to facilitate traditional integral-type analysis, but also uniquely support ratetype calculations that can be leveraged by analysis software. Model calibration uses the Northwestern University (NU) database of creep and shrinkage tests to determine new model parameters. The proposed model uses minimal inputs that are often known or may be assumed by the design engineer. Comparison of the proposed model to historical time-dependent models indicates that the new model provides a superior fit over a wider range of inputs.
10.14359/51738709
19-437
May 1, 2022
Vasiliki Palieraki, Elizabeth Vintzileou, and John F. Silva
119
Provisions for the calculation of interface shear strength have remained unchanged in ACI 318 since the 1980s. The shear friction concept, while simple to apply, does not address many of the most important influencing parameters for interface shear strength. It is silent on cyclic loading, intermediate levels of interface roughness, and the strength of interfaces reinforced with short dowels. To assess the approach included in ACI 318 and to enable the formulation of a new approach, a comprehensive database of test results has been assembled. The results of recent cyclic shear tests performed at the National Technical University of Athens (NTUA) have been combined with the results of investigations conducted worldwide between 1960 and 2020—a total of nearly 1240 tests—to provide a definitive basis for the development of a model for the accurate prediction of interface shear strength under both monotonic and cyclic displacements.
10.14359/51734519
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