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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:
SP183-03
Date:
May 1, 1999
Author(s):
S. Megally and A. Ghali
Publication:
Symposium Papers
Volume:
183
Abstract:
Design of connections of columns to flat slabs to ensure safety against punching failure is presented. The connections transfer shearing forces and moments between the columns and slabs. The objective is to cover the design procedure in most practical situations including: interior, edge and corner columns, prestressed and nonprestressed slabs, slabs with openings and slabs with shear reinforcement. The ACI 318-95 code requirements are adhered to where applicable. The designs are demonstrated numerical examples. Design of shear reinforcement in raft slabs, footings and walls subjected to concentrated horizontal forces is also discussed.
DOI:
10.14359/5533
SP183-04
W. Gamble
The yield line theory for the determination of the ultimate load for slab structures is a well documented method of analysis. The basics of the method, which can be implemented using either equations of equilibrium or virtual work equations, are briefly reviewed, using a rectangular panel with all edges supported. A more complex single panel is then considered, followed by a brief review of multi-panel failure mechanisms. The potential importance of in-place forces, both compression and tension, is noted. These forces, which can be thought of in arch or dome terms for compression and catenaries for tension, have led to slab failure loads much greater than can be explained on the basis of flexure alone in many test. This phase of behavior is seldom usable for normal design of civil structures, but may be very useful and helpful in trying to understand the behavior of and design structures to resist blast loadings.
10.14359/5534
SP183-05
S. Simmonds
This paper review the requirements of the upper-and-lower-bound theorems of plasticity as they apply to continuous reinforced concrete slabs. The background and assumptions leading to Johansen's yield line theory (upper-bound) and Hillerborg's strip methods (lower-bond) are presented and the advantages and disadvantages of these two methods are discussed. The segment equilibrium method proposed by Wiesinger is described and presented as an alternative procedure. It is concluded that the theory of plasticity provides a practical solution for the design of continuous reinforced concrete slabs, particularly for slab systems with irregular support geometry.
10.14359/5535
SP183-06
S. Alexander
Hillerborg's strip method of design (1, 2) is a powerful and versatile technique for designing two-way reinforced concrete slabs and plates. The method is based on the lower bound theorem of plasticity, meaning that a design based on the strip method is always safe. The purpose of this paper is to provide an overview of the strip method, including design examples. The strip method is usually divided into tow parts. The simple strip method is used to design edge supported slabs. Many designers will recognize this as an application of the strong-band concept. The advanced strip method is used to design slabs with column supports or reentrant edge supports.
10.14359/5536
SP183-07
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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