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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:
SP232-09
Date:
October 1, 2005
Author(s):
Y. Tan and S. Teng
Publication:
Symposium Papers
Volume:
232
Abstract:
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.
DOI:
10.14359/14941
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
SP232-15
A.B. Ajdukiewicz and J.S. Hulimka
To improve punching shear capacity of slab-column connections, and toreplace other kinds of strengthening, the composite joints were introduced. The idea isto use combined head-and-column precast members and cast on site remaining partsof slabs. Following this general idea the precast parts from high performance concrete(HPC) and fiber reinforced high-performance concrete (FRHPC) were introduced. Thetests of such axi-symmetrical joints were done by the authors. The first two series ofmodels with the composite joints were tested to compare results and behavior ofconnections with HPC precast heads and formerly tested models with prefabricatesfrom ordinary concrete. The size of models was 2.7 ´ 2.7 m, with a total slab thicknessof 0.26 m. Three different sizes and two shapes of heads – circular and square – wereused in the tests. The final series of models was prepared with FRHPC heads. Eachseries contained four models, so the experimental data from 16 tests are presented.The heads from FRHPC appeared satisfactory to carry punching forces over two timesgreater than heads from the same HPC without fibers. Advantages from use of FRHPChead-and-column precast members have been confirmed in multi-phase failure as wellas in the significant increment of punching shear capacity of connections. On the basisof experiments, the analytical model of punching failure was calibrated. This model istaking into account the recent simplified physical models for homogenous slab-columnconnections and the failure criterion based on facture mechanics.
10.14359/14947
SP232-10
A.G. Sherif, M.B. Emara, A.H. Ibrahim, and S.A. Magd
The effects of the column dimensions on the punching shear strength andductility of slab-column connections are investigated. For this purpose, five edgecolumn-slab connections were tested. The parameters were the column aspect ratioand the perimeter length of the critical shear section. The test results in addition to testresults from the literature for interior columns are compared with the shear strengthprovisions of the ACI Code. The validity of applying the shear strength equationsoriginally developed for interior connections is investigated, in particular with respect tothe effect of the column dimensions.
10.14359/14942
SP232-08
W.H. Dilger, D.C. Dechka, and S.J. Brown
The first part of this paper presents an overview of the known experimentalwork on isolated slab-column specimens, subjected to reversed-cyclic lateral loadingsimulating seismic loads and displacements. The first part includes a review of tests oncontinuous slab-column frames, subjected to reversed-cyclic lateral loading. Almost allof the test specimens contain shear reinforcement as early studies showed that shearreinforcement not only increases the shear resistance, but significantly improves theductility of the connections.The next section on theoretical studies describes the methods used to predict theflexural strength of the slab-column connection, such as the yield-line theory. Theeffect of flexural cracking on the stiffness of the slab and columns is discussed. Also, aproposal for the relationship between the lateral drift ratio and the probable momentresistance of the connection is presented.The paper concludes with a review of current (and proposed) code provisions for theanalysis and design of slab-column connection in seismic zones.
10.14359/14940
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