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Research Article

Estimating vibration period of reinforced concrete moment resisting frame buildings

Thaer Alrudaini

Department of Civil Engineering, University of Basrah, Basrah, Iraq

Keywords

Abstract



Fundamental period;


Modal analysis;


Moment resisting frame;


Vibration;


Reinforced concrete buildings

One of the initial steps in the analysis and design of buildings subjected to lateral loads is estimating the fundamental vibration period of the building. Design codes and standards recommend conducting modal analysis to investigate the fundamental vibration period of the building. On the other hand, these design codes and standards specify simple empirical models that relate the fundamental period to the building height as an alternative approach to modal analysis. In this study, extensive modal analyses were conducted to investigate the fundamental period of 382 building models. Modal analyses were conducted to evaluate the effect of design parameters on the fundamental vibration period of reinforced concrete moment resisting frame buildings. The effect of each design parameter was identified using sensitivity analysis. Finally, a simple model was developed in this study based on the results of modal analysis to estimate the fundamental vibration period of the buildings. Main design parameters including building height, spans length, columns elasticity and columns size were considered in the developed model. The proposed model was validated against modal analysis in which a mean value of the proposed model to modal analysis predictions ratio equal to 1.00 ± 0.155 with coefficient of variation equal to 15.38 were obtained.

© 2023 MIM Research Group. All rights reserved.

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