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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 16 Abstracts search results
Document:
SP232-05
Date:
October 1, 2005
Author(s):
M.A. Polak, E. El-Salakawy, and N.L. Hammill
Publication:
Symposium Papers
Volume:
232
Abstract:
The paper presents an overview of different shear reinforcing methods forflat concrete slabs supported on columns. Typical reinforcing systems are described forboth new construction and for retrofitting existing slabs. These systems have beenstudied, tested and used in construction in the last several decades. The description ofthe reinforcement types, properties, methods of design, and construction issuesrelated to placement in slabs is included in this paper. The aim is to show theimportance of providing shear reinforcement in flat concrete slabs in the vicinity ofcolumns in terms of both strength and ductility. The theoretical background and themost important requirements for the effective shear reinforcement are emphasized anddiscussed. Selected experimental results are presented to illustrate the performanceof slabs with different types and placement configurations of shear reinforcements inslabs.
DOI:
10.14359/14937
SP232-09
Y. Tan and S. Teng
Presented in this paper is an experimental program involving the testing offive 3/4 scale, interior slab-rectangular column connections subjected to combinedeffects of gravity and biaxial unbalanced moments. This experiment investigates theeffects of biaxial loading, and use of stud shear reinforcement, on the performance ofthe connections for rectangular columns with aspect ratio of 5. The main parametersstudied are the strength, drift capacity, ductility, and stiffness of the slab-columnconnections. It was found that biaxial unbalanced moments reduce considerably thestrength, ductility, drift capacity, and stiffness of the connection. It was also found thatslab-column connections with rectangular columns having column aspect ratio of fiveand loaded biaxially may not be able to sustain a drift ratio of 1.5% even if gravity shearratio Vg/Vo is kept less than 0.4.
10.14359/14941
SP232-12
J. Hegger, A. Sherif, and R. Beutel
The new DIN 1045-1 and the German Construction Approval Z-15.1-213 fordouble-headed studs are discussed and essential background information ispresented. In addition, comparison is made with the ACI 318-02 Code and the ACI 421report. Differences between the codes are reviewed and highlighted. Emphasis is seton the parameters affecting the punching resistance of slab-column connections, themoment transfer between slab and column, shear reinforcement (stirrups and headedbars), and punching of reinforced concrete footings. The code provisions are evaluatedby comparing with test results.
10.14359/14944
SP232-04
W. Dilger, G. Birkle, and D. Mitchell
This paper starts with a review of the major international codes with regardto the effect of the flexural reinforcement on the design equations for punching shearof two-way slabs. A review of experimental programs in which the main parameter isthe flexural reinforcement ratio follows. In addition to the flexural reinforcement ratio,the type and grade of reinforcement, the arrangement of the reinforcement and theconcrete cover are also investigated.Evaluation of the parameters investigated shows a distinct decrease of the punchingshear resistance with decreasing reinforcement ratio. If shear failure occurs beforeflexural yielding has developed, the value of the yield strength does not affect theshear resistance of slabs. A concentration of the flexural reinforcement in the vicinity ofthe column resulted in a strength increase only if the reinforcement was well anchored,otherwise the reduced bond of closely spaced reinforcing bars will not lead to anincrease in the punching shear strength. The test results on concrete cover are not fullyconclusive, but it is argued that it is the effective depth rather than the slab thicknessthat governs the shear and flexural behavior of a slab.
10.14359/14936
SP232-03
D. Mitchell, W.D. Cook, and W. Dilger
This paper presents some code expressions for the punching shear strengthof slab-column connections. The influence of slab thickness (size effect), columnaspect ratio and concrete compressive strength are investigated by examiningexperimental results.
10.14359/14935
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