Higher-Order Vibration Modes and Dynamic Base Shear of Irregular Buildings on Moderately Rigid Soils
DOI:
https://doi.org/10.35381/i.p.v8i15.5198Keywords:
Building maintenance, vibration, quantitative analysis, data analysis, factor analysis, (UNESCO Thesaurus)Abstract
The objective of this study was to evaluate the dominant vibration modes and dynamic base shear of irregular buildings on moderately stiff soils. Methodologically, the research was conducted using a quantitative approach that combined literature review and experimental methods. Twenty-one three-dimensional structures with 4, 7, and 10 stories were modeled, considering seven types of irregularities defined by the current building code. Using dynamic spectral and linear static analysis, the vibration periods, effective masses, participation factors, and base shear forces were determined. The results showed that 10-story buildings exhibit a significant influence of higher modes in all cases analyzed, whereas in 7-story buildings, this influence is evident in half of the models. In conclusion, height and the type of irregularity are determining factors in the activation of higher modes, and nonlinear dynamic analysis is recommended for buildings taller than 7 stories.
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