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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

Document: 

SP106-03

Date: 

June 1, 1988

Author(s):

Robert H. Iding, Boris Bresler, and Susan P. Dawson

Publication:

Symposium Papers

Volume:

106

Abstract:

The complex factors that influence behavior and strength of concrete components failing in shear pose serious obstacles to the use of traditional linearly elastic analysis techniques. However, recent developments in the application of nonlinear finite element methods and in modeling nonlinear material properties have allowed the development of a computer model to effectively analyze complex nonlinear situations. The model includes material laws representing the full inelastic response of concrete cracking and crushing (including effects of triaxial confinement) and the yielding of reinforcing steel bars. This computer model is verified using data from a test program involving nine reinforced concrete shear-sensitive beams of varying dimensions and span-to-depth ratios. Calculated and measured failure modes, deflection and cracking patterns, and ultimate capacities corresponded well in all of the beams compared. A computer program based on the verified model has been used by the authors in several applications to predict ultimate capacity and failure modes for complex systems of walls, beams, and slabs. One such application, the prediction of shear strength in the reinforced concrete ice walls of an offshore concrete gravity-based structure, is discussed in detail.

DOI:

10.14359/2887

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

Document: 

SP106-04

Date: 

June 1, 1988

Author(s):

L. J. Kaetzel ane J. R. Clifton

Publication:

Symposium Papers

Volume:

106

Abstract:

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.

DOI:

10.14359/1979

Document: 

SP106

Date: 

June 1, 1988

Author(s):

Editor: Victor E. Saouma / Sponsored by: ACI Committee 118

Publication:

Symposium Papers

Volume:

106

Abstract:

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

DOI:

10.14359/14139

123

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