Modeling of Gravity-Load-Designed RC Frame Buildings for Nonlinear Dynamic Analysis

Abstract eng:
To evaluate seismic performance of Gravity-Load-Designed (GLD) RC buildings, accurate but yet efficient nonlinear models for GLD RC members are essential. The main objective of this study is to develop the nonlinear models for GLD RC members which are applicable to nonlinear dynamic analysis. Based on macro-modeling approach, nonlinear models for beams, columns, and beam-column joints were developed. These models are able to simulate hysteretic force-deformation relations which are governed by modes of failure experienced by RC members. In particular, the models can simulate lap-splice, shear, flexure, joint-shear, and bond-deterioration failures. To validate the models, experimental force-deformation relations of column and beam-column joint specimens were compared to those obtained from the models. A very good agreement was found. Finally, to illustrate the applicability of the proposed models, a mid-rise GLD RC frame building was analyzed. It was found that the seismic behavior of the building was controlled by interactions among different failure mechanisms experienced by critical members. The proposed nonlinear models can be used in future researches to conduct detailed seismic performance evaluation of GLD RC frame buildings.

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