Análisis teórico experimental de la variación del periodo fundamental durante el proceso de construcción de un edificio de acero

Abstract

This study documents a theoretical and experimental analysis of the fundamental period of vibration in a seven-story building. The building in study is located in the Catholic University campus, in Quito. The structure is composed of a steel moment resisting frame with shear walls and steel deck. The dynamic properties of the building, such as the fundamental period of vibration, were obtained experimentally through ambient vibration tests. The collected records were processed using the Fourier transform with a methodology described in this study. Additionally, this study is complemented by the construction of computational models in which the different construction stages are considered. The models include the presence of masonry and other non-structural elements. Hence, it allows a more realistic model which can be calibrated and compared with the experimental results. The participation of walls denotes a decrement in the fundamental period. This is because walls increase stiffness. Oppositely, the increase of non-structural elements that collaborates only with mass increases the period because the structure is more flexible. Finally, in this study different expressions given by codes and literature are compared with the experimental and analytic results in order to generalize the importance of non-structural elements in the determination of the fundamental period of vibration in steel structures.