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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 8 Abstracts search results
Document:
SP111-06
Date:
December 1, 1988
Author(s):
L. I. Nedelcu
Publication:
Symposium Papers
Volume:
111
Abstract:
Presents an optimum design for a given prestressed concrete member, chosen from an existing shape library and a given external load system. It is emphasized that, as part of the given data, the tendon diagram is determinant in designing a prestressed concrete member. The analysis is based on the elastic behavior of the member, and a realistic investigation of the capacity of the member is performed. The whole process implies an appreciable volume of computations and is suitable for digital computers. A design aid for the initial and final stages of the prestressed concrete member is also presented.
DOI:
10.14359/3667
SP111-05
W. J. Irwin
The features of commercial spreadsheet software can be used effectively to create templates that analyze and design reinforced concrete structures on microcomputers. Such a template was developed and used to prepare standard drop inlet box designs for a forthcoming ASTM Standard and is presented as an example of a template application. This template analyzes a symmetric concrete frame considering finite joint sizes and axial compression and designs the required reinforcing steel. The results are verified with general purpose structural analysis software and with published design solutions. The benefits of using templates for engineering work is maximized with a layout format that places all input and output results on the main screen for quick refining of trial designs. The main advantages of template development over computer language programming are layout logic, intermediate calculation accessibility, and lack of formatting requirements for data entry and printed results.
10.14359/3649
SP111-07
R. Mician
Reinforced and later post-tensioned slabs as foundations for residential and light commercial building were introduced in the 1950s. Low-cost and easy to build, they were constructed at an average rate of 1.5 million per year. In 1976, PTI (Post-Tensioning Institute) initiated research at Texas A & M University to improve the design method. The results were published in 1980. Responding to the complexity of required calculation, part of the climate-soil-structure modeling was calculated by computer and tabulated for quick use. Even so, the method requires computer-aided design, illustrated by the analysis of the failed slab. The printout indicates all weak points of the slab and the probable cause of failure. A structurally sound redesigned slab is calculated next. The printout shows all parameters in limits prescribed by the code. Minimal increase in initial cost can save thousands of dollars in repairs.
10.14359/3637
SP111-04
C. A. Zeris and S. A. Mahin
With the rapid advancement of powerful and relatively low-cost minicomputers, refined analytical techniques are now possible to apply during the design stage. An interactive program is presented herein for such refined analysis of beam-column sections under generalized biaxial bending and axial load. The program has a wide range of analysis options for the estimation of complex hysteretic response and three-dimensional interaction diagrams. In addition, it is equipped with a portable window manager, mouse driven input, and editing options and color graphics for on-line inspection of input and analysis results. Different types of materials can be specified such that reinforced, prestressed concrete or plain/composite steel sections can be considered. The section model is idealized as an assembly of fibers acting under a uniaxial state of stress. The section model theory is extended to represent entire members for the nonlinear finite element analysis of complete buildings.
10.14359/3628
SP111-03
S. Malasri and S. Maldonado
Concrete Mix Designer is a prototype expert system that provides the proportion of the trial mix of concrete in accordance with the ACI method. It was developed using the Personal Consultant Plus expert system development package. As most expert systems, this system can justify its conclusions, can be incrementally expanded, and has an easy-to-understand knowledge base. It also has a tutorial for fundamental questions of the proportioning of concrete. The system is very useful for civil engineering students as well as practicing engineers.
10.14359/3614
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