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
Showing 1-5 of 15 Abstracts search results
Document:
SP87-09
Date:
September 1, 1985
Author(s):
S. E. Swartz, A. Nikaeen, H. D. Narayan Babu, N. Periyakaruppan, and T. M. E. Refai
Publication:
Symposium Papers
Volume:
87
Abstract:
Higher strength concrete which is defined to be that with uniaxial, 12000 psi compressive strength in the range of 6000 psi
DOI:
10.14359/6528
SP87-10
Andrew G. Mphonde and Gregory C. Frantz
Twelve reinforced concrete beams with stirrups were tested to determine their diagonal cracking strengths and ultimate shear capacities. At a constant shear span/depth ratio of 3.6, the stirrup shear strength was equal to 50, 100, or 150 psi (0.34, 0.69, or 1.03 MPa). Within each group the nominal concrete compressive strength varied from 3000 to 12,000 psi (21 to 83 MPa) in otherwise identical specimens. The ACI shear design method was found to be very conservative. A new equations presented to more accurately predict the ultimate shear capacity.
10.14359/6529
SP87
Editor: Henry G. Russell
SP87 High-strength concretes are used frequently in applications requiring slender members to carry large loads or span long distances. Early applications of high-strength concrete emphasized its use to reduce column dimensions. More recently, high-strength concrete has been used to meet special project objectives such as large composite columns and stiffer structures. In turn, the use of high-strength concrete has prompted the applications of more stringent quality control requirements. This publication highlights the use, design implications, and research results of applications of high-strength concrete.
10.14359/14044
SP87-11
Y. K. Yong, Douglas H. McCloskey, and Edward G. Nawy
High strength concrete is used in increasing volume in the construction of structural components. While much research has been done on reinforced concrete corbels, experimental data on the behavior of corbels using high strength concrete remain scarce. The ACI Special Provisions for Brackets and Corbels is based primarily on experimental results of corbels with concrete strength less than 6000 psi (41.4 MPa). The purpose of this study is to check the applicability of the ACI Code and the truss analogy theory proposed recently by Hagberg to reinforced concrete corbels with concrete strengths greater than 6000 psi (41.4 MPa). A total of eight corbels, divided into four series with concrete strength ranging from about 6000 psi (41.7 MPa) to 12,800 psi (82.7 MPa) were studied in the Rutgers Civil Engineering Laboratory. The corbels (shear span to dept ratio, a/d = 0.39) were loaded monotonically to failure and magnitudes of the strains in the primary steel, stirrups and cage steel were recorded along with the vertical load. Analysis of results indicated that the ACI Code Provisions are conservative. The truss analogy model predicts values which are safe and less conservative than the ACI Code. The degree of conservatism of the ACI Code found in the case of these tests will not necessarily be found in tests with larger a/d ratios and/or tests in which outward horizontal loads are applied to the specimens in addition to the vertical loads.
10.14359/6530
SP87-12
Lateral Reinforcement For High-Strength Concrete Columns
The basic philosophy of the current ACI Code for confining concrete in earthquake design is that the increase of the strength of the core of the column due to confinement must offset the loss of strength due to spalling of the unconfined cover. The equatians given in the code are based on the assumption that when a reinforced concrete column is subjected to uniaxial load the maximum capacity of the confined core is reached when the unconfined cover starts spalling. It is not clear whether this assumption is applicable for high strength concrete. The strains at which the cover concrete and confined concrete -will reach their maximum capacities will depend on their respective stress-strain curves. In this paper, based on several sets of experimental data, analytical expressions are proposed for the stress-strain curves of confined and unconfined high-strength concrete. Using these analytical expressions, moment-curvature relationships are predicted. The predicted curves were compared with the experimental data of columns subjected to reversed lateral loading. Rased on the satisfactory comparison for normal strength concrete columns, the theoretical model is then applied to high‘ strength concrete.
10.14359/6531
Results Per Page 5 10 15 20 25 50 100
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.
Edit Module Settings to define Page Content Reviewer