Evaluating the Effect of Multiple Earthquakes of Different Frequency Content on Steel Buildings

Monica Malhotra¹* and Lamuo Francis Suglo^2
1Associate Professor, Civil Engineering Department, PDM University, Bahadurgarh (Haryana)
²Civil Engineering Department, Bolgatanga Technical University, Ghana
*Corresponding Author: Monica Malhotra, Associate Professor, Civil Engineering Department, PDM University, Bahadurgarh (Haryana).

Published: September 11, 2024

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Abstract  

The effects of multiple earthquakes of different frequency content on the global response of steel building are presented in this paper. Multiple earthquakes forming sequences as mainshock-aftershock pairs, three (3) steel moment resisting frames of 10-storey (H10), 15-storey (H15) and 20-storey (H20) were analyzed according to the code provisions of IS 1893 (Part 1): 2016 using sequential nonlinear response history analyses. The frequency content of mainshock and aftershock records were varied based on the PGA/PGV ratio. The result produced expected differences in structural responses conditional on the frequency content and the dynamic characteristics of each model. The outcome is measurable differences in the structural response, with the inter-storey drift and other structural response parameters changing due to the different frequency characteristics of the aftershocks. It is expected that the conclusions drawn in this paper will lead to an improvement of the IS 1893 with regards to multiple earthquake effect for an improved design and construction of steel frame structures in India, which will lead to better seismic performance.

Keywords: foreshock; aftershock; ground motion; frequency content; steel building; earthquake

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