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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:
SP183
Date:
May 1, 1999
Author(s):
Editor: T.C. Schaeffer / Sponsored by: Joint ACI-ASCE Committee 421
Publication:
Symposium Papers
Volume:
183
Abstract:
This Symposium Publication consists of 10 papers that give the designer an overview of some of the different analysis and design techniques currently being used. 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. SP183
DOI:
10.14359/14176
SP183-10
S. Alexander
A part from column-slab connections, almost all reinforced concrete connections can be analyzed and designed using plastic strut and tie models. The strut and tie model provides a simple, rational and highly transparent explanation for the flow of forces within a connection. By examining a unique substructure within a column-slab connection, Alexander and Simmonds (1) develop what amounts to a plastic strut and tie model for concentrically loaded connections between interior columns and two-way slabs with orthogonal reinforcement. On the basis for this model, a general design procedure for gravity-loaded column-slab connections has been developed. The resulting design procedure is simple and it handles column-slab connection problems that are not easily analyzed by existing code provisions. This paper outlines the design procedure and the important features of the model upon which it is based. The model is compared both to existing test results in the literature and to the ACI code design procedure. Two design examples are included.
10.14359/5869
SP183-09
A. Scanlon
Deflection control for two-way slab systems requires attention to both design and construction requirements. This paper discusses both aspects and provides a design example to illustrate how construction loads, cracking and time-dependent effects can be accounted for in slab deflection calculations.
10.14359/5539
SP183-08
D. Rogowsky
This paper deals with the selection of slab reinforcement and details from the perspective of serviceability. The focus is on extending traditional detailing rules to slabs with higher strength concrete, and to slab designs based on finite element analysis. Traditional detailing rules when used with the direct design method and equivalent frame method produce satisfactory slabs for "ordinary" applications. Slabs that fall outside the limits of applicability of the equivalent frame method are becoming more common due to the relatively ease with which one can obtain a finite element solution from elastic bending moments and forces. Detailing rules need to be gen33eralized to deal with higher strength concrete and the results of a finite element analysis, so that one can select reinforcement that provides adequate strength and serviceability. The issues addressed in this paper include: minimum reinforcement requirements; bar size, spacing and layout; bars oriented in non-principal monument directions; skew reinforcement; in-plane forces; and edge reinforcement. While there are other detailing issues, those discussed tend to have the most impact on slab performance and cost.
10.14359/5538
SP183-07
W. Gamble
The Equivalent Frame Method (EFM) of the ACI Code was developed when the predominate method of structural analysis was the Moment Distribution method. It was furthermore developed primarily for vertical loadings. While there exist special-purpose programs intended for slab analysis using the EFM, the purpose of this paper is to present a method of using the EFM approach with an ordinary plane-frame program. This can be accomplished for the vertical loading case by the use of a substitute moment of inertia, Iec, for the columns. For the lateral loading case, the beam which replaces the slab in the analysis has to have a reduced moment of inertia, with the reduction having two parts. One part is to reflect the state of cracking, with the second part being an "effective width" factor which depends on the panel shape.
10.14359/5537
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