Effects of Different Factors of Structures on Natural Time Period

<p><span lang="EN-US">Indian standard suggests that the natural time period is dependent on a building and its base dimensions. In this study, the analysis is performed to determine variations in the natural period based on different building parameters. A total of 10 buildings are analyzed in detail. One of these buildings, specifically a five-storey structure, is selected as the reference and will be referred to as the Benchmark Building. It consists of a bare frame with a plinth beam (without a slab) at the ground floor level. Different types of buildings are assessed for various effects due to stiffness, mass, building height, and column orientation to investigate the natural period. The analysis is performed in a manner consistent with the work of C. V. R. Murty, augmented by the addition of an ETABS-based shell and membrane model. According to the test results from the conducted study, it is evident that as the stiffness, mass, and number of storeys of a building increase, the natural period also increases. Additionally, regarding column orientation, the natural period is longer in the shorter direction of column size compared to the longer direction. The comparative analysis indicates that the natural period is greater when assessed using ETABS. Furthermore, the natural period values from the ETABS-based membrane model are higher than those from the shell-based model.</span></p>