MAE Broadcast!

SIMULATED SEISMIC LOADING OF A TWO-STORY PRECAST REINFORCED CONCRETE BUILDING Thursday, April 25, 2002: 4:00 – 5:00 CDT

Mario Rodriguez Professor, National University of Mexico, Mexico City

	Most of the research conducted in the past on the seismic behavior of precast concrete buildings has been on frame systems. Dual systems, which combine structural walls and frames for resisting lateral forces, have been subjected to very limited research work. Experimental work was conducted at the National University of Mexico on a half-scale two-story precast concrete building incorporating a dual system. The building was tested under simulated seismic loading up to failure. The test specimen represents a parking structure designed for the highest seismic hazard area in Mexico City. Beams, columns and walls were precast. The two-story columns and walls were connected to the foundation by embedding them in socket connections and then grouted. The beam-to-column joint region in the column was not cast enabling the framing beams to seat and pass the longitudinal reinforcement. The precast beams spanned between columns. Hooked bottom beam longitudinal bars were anchored in the beam-to-column joints using closed hoops. The top beam reinforcement was placed in-situ on top of precast beams. Double tees were used for the two floors, and topping cast-in-place slab was cast over the floor system. The specimen was tested under quasi-static cyclic reversed loading until severe damage was developed in the structure at large interstory drift. Most of the damage was concentrated at the wall bases, as well as at the floor-to-wall connections. Typically, buckling of longitudinal bars and crushing of concrete at the wall bases were observed at the end of testing. Less damage was observed at the beam-to-column connections. Design criteria and code implications resulting from the test program are discussed.

	Mid-America Earthquake Center Seminar Series

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