Seismic Resistance of Reinforced Concrete Frame Structures Designed Only for Gravity Loads-Part III: Exp Performance and Analytical Study of a Model
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This report is Part III of a three-part series prepared for a comprehensive evaluation of typical gravity load designed low-rise reinforced concrete frame buildings (lightly reinforced concrete structures) for seismic adequacy. The study was done at the State University of New York at Buffalo - Earthquake Simulation Laboratory on a 1:3 scale building model designed for gravity loads only. The one-third scale three story model, one-bay by three-bay, of a typical office building was constructed to represent the critical interior bay of a prototype structure. A series of ground motion tests were performed on the one-third scale building model using scaled accelerograms on the shaking table to represent minor to severe earthquakes. The dynamic characteristics of the model after each seismic event were identified from white noise shaking table tests. Results of this experimental investigation are presented here. Analytical models were developed to predict and interpret seismic response of the building model based on identified member properties from engineering approximations, component tests, and an experimental response fit. It is shown in this report that the response predictions based on integrating the behavior from component tests (presented in Part II of this report series) provide adequate correlation of the seismic structural response behavior, emphasizing the importance of such component testing. A damage evaluation of the building model was performed analytically to assess structural integrity after the induced ground motion in terms of damage states. A modified damage model is proposed.