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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 11 Abstracts search results
Document:
SP106-02
Date:
June 1, 1988
Author(s):
M. Hoit, F. Fagundo, and t. Hamilton
Publication:
Symposium Papers
Volume:
106
Abstract:
A substructuring technique to analyze equivalent frames according to ACI 318-83 is presented. A more consistent implementation of the equivalent frame method is formulated. The width of the column strip and the percentage of torsional stiffness required are studied. A program that will analyze a building system subjected to gravity as well as lateral loads is developed.
DOI:
10.14359/2766
SP106-04
L. J. Kaetzel ane J. R. Clifton
Describes an expert system with a knowledge base consisting of freeze-thaw, sulfate, alkali-aggregate, and corrosion aspects of concrete durability. The system was developed on a microcomputer using an expert-system shell facility. This paper discusses knowledge acquisition, knowledge representation, issues relating to the maintenance of expert systems, and recommendations for field implementations.
10.14359/1979
SP106-08
Victor E. Saouma, Saurine, Saurine Doshi, and Michael S. Jones, and Efthimios S. Sikiotis
A brief overview of current research undertaken on computer-aided design of reinforced concrete is presented. The following research projects, related to concrete structures, are briefly discussed: 1) interactive graphics optimum design of reinforced concrete frames; 2) interactive graphics optimization-based design of partially prestressed concrete beams; 3) hybrid design program for the design of reinforced concrete frames; and 4) usage of expert systems as quality assurance programs for the design of reinforced concrete to check their compliance with all the appropriate ACI Building Code provisions.
10.14359/3072
SP106-09
Dexiang Shi
An automatic quantitative image analysis (AQIA) software system has been developed to quantify constituents in multiple phase materials, such as hardened cement and concrete. Some major features of AQIA are presented. The applications of AQIA to cement and concrete research are explored. The system is expected to provide a more versatile, and more reliable means than the manual microscope examination. It is much less expensive than existing hardware-type image analyzers, and specially designed for materials use.
10.14359/3562
SP106-01
J. D. Glikin, S. C. Larson, and R. G. Oesterle
Design and construction of bridges composed of simple-span, pretensioned girders made continuous for composite dead and live loads have become widespread. The design of these structures in the U.S. has been generally based on the procedure outlined in "Design of Continuous Highway Bridges with Precast, Prestressed Concrete Girders," published by the Portland Cement Association (PCA) in 1969. Although existing bridges designed by this procedure are generally performing well, it is believed that this method may not accurately predict the true behavior of these structures. One of the major uncertainties in the design of these structures is prediction of positive and negative moments in the cast-in-place connections at the piers. This uncertainty is due to the different loading and construction stages, time-dependent effects, and details used to make the connection. To resolve such uncertainties, an analytical study was conducted to develop guidelines for more rational design of the continuity connections. Paper summarizes results of an extensive parametric study to consider the effects of 1) construction sequence, including simple span behavior before and continuous behavior after casting the deck and diaphragms; 2) time-dependent behavior, including concrete creep and shrinkage, and steel relaxation; 3) live load applied at any stage of service life; 4) cracking resulting from both positive and negative moment, including "tension stiffened" stress-strain relationships for reinforcement; and 5) closing of cracks when combined dead load plus time-dependent moments are reversed by application of live loads.
10.14359/3042
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