- Open Access
Effective punching shear and moment capacity of flat plate-column connection with shear reinforcements for lateral loading
International Journal of Concrete Structures and Materials volume 6, pages19–29 (2012)
In this study, three isolated interior flat slab-column connections that include three types of shear reinforcement details; stirrup, shear stud and shear band were tested under reversed cyclic lateral loading to observe the capacity of slab-column connections. These reinforced joints are 2/3 scale miniatures designed to have identical punching capacities. These experiments showed that the flexural failure mode appears in most specimens while the maximum unbalanced moment and energy absorbing capacity increases effectively, with the exception of an unreinforced standard specimen. Finally, the results of the experiments, as wel l as those of experiments previously carried out by researchers, are applied to the eccentricity shear stress model presented in ACI 318-08. The failure mode is therefore defined in this study by considering the upper limits for punching shear and unbalanced momen t. In addition, an intensity factor is proposed for effective widths of slabs that carry an unbalanced moment delivered by bending.
ACI Committee 318, Building Code Requirements for Structural Concrete(ACI 318-08) and Commentary(ACI-318R-08), American Concrete Institute, Farmington Hills, MI, 2008.
Atena, ATENA Program Documentation, Cervenka Consulting, Czech Republic, 2000.
Elgabry, A. A. and Ghali, A., “Tests on Concrete Slab-Column Connections with Stud-Shear Rein-cement Subjected to Shear-Moment Transfer,” ACI Structural Journal, Vol. 84, No. 5, 1987, pp. 433–442.
Hawkins, N. M., Bao, A., and Yamazaki, J., “Moment Transfer form Concrete Slabs to Column,” ACI Structural Journal, Vol. 86, No. 6, 1989, pp. 705–716.
Islam, S. and Park, R., “Tests on Slab-Column Connections with Shear and Unbalanced Flexure,” Journal of the Structure Division, Vol. 102, No.3, 1976, pp. 549–568.
Joint ACI-ASCE Committee 421, Shear Reinforcement for Slabs, American Concrete Institute, Farmington Hills, MI, 1999.
Kang, T. H.-K. and Wallace, J. W., “Seismic Performance of Reinforced Concrete Slab-Column Connections with Thin Plate Stirrups,” ACI Structural Journal, Vol. 105, No.5, 2008, pp. 617–625.
Pilakoutas, K. and Li, X. “Alternative Shear Reinforcement for Reinforced Concrete Flat Slabs.” Journal of Structural Engineering, Vol. 129, No.9, 2003, pp. 1164–1172.
Robertson, I. N., Kawai, T., Lee, J., and Enomoto, B., “Cyclic Testing of Slab-Column Connections with Shear Reinforcement,” ACI Structural Journal, Vol. 99, No.5, 2002, pp. 605–613.
The CEB/fib Task Group, Punching of Structural Concrete Slabs, International Federation for Structural Concrete(fib), Lausanne, Switzerland, 2001.