الفهرس | Only 14 pages are availabe for public view |
Abstract As a continuation to a research program that have been undertaken at the department of structural engineering of the University of Alexandria for studying the strength and behavior of reinforced concrete slab-column connections, a total of twenty specimens have were tested to failure. Fourteen of these specimens were for the study of slab-edge column connections with spandrel beams. The other six specimens were for the study of slab-interior column connections. The experimental work that has been performed for this investigation is explained in detail. This includes specimen details, materials used and fabrication of specimens, instrumentation, loading system, and testing procedure. Behavior of the tested specimens during loading stages is described and test results are reported. The aim of this work was to study experimentally the effect of certain parameters on the strength and behavior of the two types of connections and to develope a method for predicting their strength. The experimental study conducted on the edge-connection specimens indicated that the behavior and strength of an edge connection are influenced by the presence and dimensions of a spandrel .beam, its torsion strength, the ratio of the slab tension reinforcement around the column placed normal to the spandrel beam, the ratio of the moment to the axial load that are applied onto the connection, and by the presence of openings next to column corners. The experimental study conducted on the interior column slab-connection specimens demonstrated that the behavior and strength of an interior connection are greatly influenced by the aspect ratio of the column cross section, the ratio of the column side to the slab effective depth, the moment to axial load ratio applied to the column stub, and the presence of openings next to the column corners. Based on the observed mechanism offailure, an equilibrium method is presented for predicting the ultimate capacity of a slab-edge column connection with a spandrel beam. The method takes into account the interaction between the moment and the axial load acting on the connection. When compared against tests the method has been found to be satisfactorily correlating the test results. As to interior connections, an eccentric shear stress model is proposed for predicting the strength of interior connections transferring shear force and moment between column stub and slab. The method adopts a critical section that is based on the observed mode of failure of the tested specimens in the present investigation When checked against tests, the method demonstrated satisfactory correlation between the predicted values and the test results. |