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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:
SP106-10
Date:
June 1, 1988
Author(s):
Fred T. Tracy
Publication:
Symposium Papers
Volume:
106
Abstract:
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.
DOI:
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
SP106-04
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
SP106-01
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
SP106-06
C. I. Pesquera
A series of procedures and utility programs have been developed to assist structural engineers in the development of highly graphical and interactive applications. The procedures are callable from FORTRAN-based programs. They perform such tasks as menu control, on-screen data input and verification, selection of entities from screen, control help facility, and provide a model for graphical representation of information on the screen. The programming environment is available in the DOS operating system, and it is viewed as an alternative to spreadsheet-based programming tools.
10.14359/3559
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