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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:
SP106-09
Date:
June 1, 1988
Author(s):
Dexiang Shi
Publication:
Symposium Papers
Volume:
106
Abstract:
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.
DOI:
10.14359/3562
SP106-10
Fred T. Tracy
Paper describes the capabilities and techniques used in a Three-Dimensional Stability Analysis/Design (3DSAD) computer program for concrete monolithic structures. The program was designed to do both nonstandard-shaped structures and specific structure types such as dams, locks, cooling towers, power houses, etc. The philosophy of the program was to first develop general geometry, loads, and analysis modules and then develop modules for specific structures using the general modules as tools. Another general purpose capability, the Free-Body Module, was then added to the collection of tools. Specific modules were also enhanced with a Design Memorandum (DM) Plate capability for final reporting of results. Paper describes the general modules and the specific modules for dams with emphasis on algorithms and procedure for the general modules.
10.14359/3078
SP106-02
M. Hoit, F. Fagundo, and t. Hamilton
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.
10.14359/2766
SP106
Editor: Victor E. Saouma / Sponsored by: ACI Committee 118
The knowledge contained in Computer Applications in Concrete Technology will prove invaluable. This symposium volume of 10 papers will provide you with the information you need to build high-quality, cost efficient structures. Presenting various practical applications of computer technology, the topics covered include: computer analysis of time-dependent behavior of continuous precast prestressed bridges; substructure modeling of two-way slab systems; an automatic quantitative image analysis system for cement and concrete research; maintenance and implementation of an expert system for durable concrete; and prediction of shear failure in concrete structures using nonlinear finite element analysis. Other subjects covered include: a three-dimensional stability analysis/ design computer program for concrete monolithic structures; and a programming environment for structural engineering applications based on interactive computer graphics." Note: The individual papers are also available as .pdf downloads.. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP106
10.14359/14139
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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