Evaluation of the Fundamental Period of Vibration of Irregular Steel Structures
Journal Title: International Journal of Engineering Sciences & Research Technology - Year 30, Vol 3, Issue 4
Abstract
The determination of the fundamental period of vibration of a structure is essential to earthquake design. Current codes equations (ASCE, 2010 and other codes) provide formulas for the approximate period of earthquakeresistant building systems, which are dependent only on the height of the structure or number of stories. Such a formulation is overly conservative and unable to account for structures with geometric irregularities. This paper investigated the fundamental periods of three different types of steel earthquake-resistant building structures: moment resisting frames (MRF), concentrically braced frames (CBF) with varying geometric irregularities. A total of 5, 10, 15 story building designed and analyzed with ETABS. The fundamental periods based on vibration theory for each example were compared with empirical equations, including current code equations as well as equations proposed in recent literature. Based on the results obtained from vibration theory (Rayleigh equation), equations for the approximate fundamental periods are put forth for MRFs and CBFs which take into account vertical and horizontal irregularities. These proposed equations will allow design engineers to quickly and accurately estimate the fundamental period of MRF and CBF structures by taking into account irregularities.
Authors and Affiliations
A. Shafei
Keywords
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