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 14 Abstracts search results
Document:
SP118-02
Date:
January 1, 1990
Author(s):
R. J. Ward, K. Yamanobe, V. C. Li, and S. Backer
Publication:
Symposium Papers
Volume:
118
Abstract:
Results of notched beam, direct tension, splitting tension, compression, shear beam, and flexural tests on plain mortar and on mortar reinforced with different volume fractions of short acrylic fibers are reported. An indirect J-integral technique is employed to determine the tension-softening curve and thus the tensile strength, the fracture energy, and the critical crack opening from the notched beam test results. As the volume fraction of fibers is increased, the strength in shear and flexure, the fracture energy, and the critical crack opening all increase, the tensile strength remains essentially constant, and the compressive strength shows some reduction. The characteristic length lch is used as a material property to characterize the post-peak tensile behavior. The shear and flexural strengths are related to the normalized dimension d/lch, and good agreement between the experimental results and theoretical predictions of decreasing strength with increasing d/lch is found.
DOI:
10.14359/2878
SP118-09
Jin-Ken Kim, Seok-Hong Eo, and Hong-Kee Park
In most of the structural members with initial cracks, the strength tends to decrease as the member size increases. This phenomenon is known as size effect. Among the structural materials of glass, metal, or concrete, etc., concrete represents the size effect even without initial crack. According to the previous size effect law, the concrete member of very large size can resist little stress. Actually, however, even the large-size member can resist some stress if there is no initial crack. In this study, the empirical models for uniaxial compressive strength that are derived based on nonlinear fracture mechanics are proposed by the regression analysis with the existing test data of large-size specimens.
10.14359/2962
SP118-10
A. Carpinteri
Progressive cracking in structural elements of concrete is considered. Two simple models are applied, which, even though different, lead to similar predictions for the fracture behavior. Both virtual crack propagation model and cohesive limit analysis show a trend toward brittle behavior and catastrophical events for large structural sizes. Such a trend is fully confirmed by more refined finite element investigations and by experimental testing on plain and reinforced concrete members.
10.14359/2968
SP118-11
Y. S. Jenq and S. P. Shah
The shear resistance of reinforced concrete beams without shear stirrups has been shown to be dependent on the size of beams. It was reported that as the beam depth increases, the shear resistance of the reinforced concrete beams decreases. Furthermore, the final failure mode of the reinforced concrete beams were found to be dependent on the strength as well as beam size. All other factors (i.e., maximum aggregate size, steel ratio, and proportion of specimen dimensions) being equal, large beams and early age beams (which have relatively low strength) were observed to fail in diagonal shear while small beams and matured beams failed in flexure. To explain the size effect on the shear resistance and final failure mode of reinforced concrete beams, a fracture mechanics approach was used in the present study. It was concluded that the effect of size on the final failure mode and shear resistance of reinforced concrete beams can be reasonably explained using the fracture mechanics concept.
10.14359/2973
SP118-12
T. Shioya, M. Iguro, Y. Nojiri, H. Akiyama, and T. Okada
Experimental and theoretical studies on shear strength of large reinforced concrete beams are presented. The shear strength of a reinforced concrete beam without shear reinforcement gradually decreases as an effective depth d of a beam increases, and is generally called the size effect. From the result of the experiment on large beams, the size effect of a beam exists even for a beam deeper than 100 cm which had been outside of the scope of past experiments, and the size effect at d ò 100 cm may be considered to be inversely proportional to the fourth root of the effective depth. According to the result of a nonlinear finite element analysis, the size effect on flexural tensile strength of concrete and shear transfer across crack surfaces must be considered in estimating the shear strength of a large reinforced concrete beam.
10.14359/2978
Results Per Page 5 10 15 20 25 50 100
Edit Module Settings to define Page Content Reviewer