A Study of Flat Plate Slab – Column Connections with Shear Plate in TallConcrete Building using Experimental and Numerical Analysis

Abstract

The trend of urban building structures shows a type of high rise building due to the concentration and increase of population into urban cities, rapid increase of land cost, and limited availability of land. Such a trend is not only a worldly demand but also no exception in Asian cities. To facilitate the demand of high rise structures, various types of structural system have been used domestically. Among those structural systems, there has been a high demand in using a flat plate slab system specially in the mix use high rise buildings including commercial and residential uses because the systems have various following advantages. The system can minimize the ceiling height which can reduce a total building height and reduce the corresponding material cost. The system also provides a room for flexible spatial planning. It has an advantage of time saving because it makes easy form installation and stripping because there are no beams. It also reduces noise transmission between floors due to the thick concrete slab. However, the system carries a disadvantage of punching shear due to the absence of beams. Reinforcing method of flat plate-columnconnection has been studied in this paper. This research is to study the response of flat plate slab-column connections consisting of various types of shear reinforcement and steel plate subjected to gravity loadings using the structural experiments and numerical analysis in tall buildings. The four test specimens were prepared to model the interior bay flat plate slab-column connections in a typical flat plate slab building. The base specimen has no shear reinforcement, and the other specimens have shear studs with strip base, shear studs with short steel plates under the slab and on the top portion of the column, and shear studs with long steel plates under the slab and on top portion of the column. The base specimen failed due to punching shear generated from the gravity loading. The three other types of slab shear reinforcement and steel plate showed effective in resisting punching shear for these types of connections under gravity loading. The specimen containing studs with steel plate showed the most ductile behavior under the gravity loading. The structural behavior of the four specimens has been tested using the structural experiment and the numerical method.