Analytical Modeling of Precast Concrete Grouted Beam- column Joints under Cyclic Load

Precast concrete frame structures are in many respects superior to the traditional cast-in-place concrete structures. The structural components are built with good quality assurance in a controlled environment and building construction require less site work and can be done at a rapid paste. However, seismic performance of these structures is significantly affected by the behavior of beam-column connections. Fig. 1 shows a typical connection in which the column reinforcements are passed through corrugated steel ducts (sleeves) within the precast beam. The moment resisting connection is finally formed by grouting the sleeves after the top column is set in place. In this paper, a simplified model is presented to simulate the behavior of such joints under cyclic loading condition. The analytical model is verified with experiments which were carried out on five large-scale specimens representing such connections.