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An experimental investigation of a precast concrete connection Saxena, Rajiv Prakash


Tests on discrete connections for precast concrete panel buildings have shown that it is very difficult to design a ductile embedded connection. Typical connections use studs or reinforcing bars embedded in the edge of the panel and connected to the connection in an adjacent panel with a weld plate or ribbed bar. This is welded either to an exposed length of the embedded steel or to an angle or plate which is welded to the embedded steel. Under earthquake loading the crushing of concrete around the embedment usually leads to premature loss of strength and stiffness of the connection before any significant ductility can occur. If the connections of the precast concrete buildings cannot develop adequate ductility either the whole structure must be designed to remain elastic during an earthquake, or the connections must be stronger than other elements in the structure which can develop the necessary ductility. In practice both of these alternatives may be difficult to achieve. An alternative approach is to use a yielding connector between embedments in adjacent precast panels, in place of a rigid weld plate or bar. One way to do this is to use a mild steel tube with a longitudinal slit to permit shear distortion under earthquake loading. This detail will also accommodate relative movement between panels due to shrinkage and temperature changes. Twenty five split pipe connection specimens, made from four different types of pipe, were tested under cyclic shear loading. Results obtained for the strength, stiffness and ductility of these connections are presented and discussed. A simple formula for calculating the shear strength of these connections is proposed.

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