Moderating the Soft Storey Impact in Multi-Storey Buildings: A Comparative Seismic Investigation

Year 2024, Volume: 9 Issue: 4, 359 - 373, 31.12.2024

Shabla K , K.i. Praseeda Chıtaranjan Pany

https://doi.org/10.47481/jscmt.1607472

Abstract

A storey that has lateral stiffness less than 70% of the storey above or less than 80% of the average stiffness of the three storeys above is considered a soft storey. Ground floor open-air buildings are frequently used for parking, particularly in metropolitan settings where there are considerable space limits. Soft-storey buildings with irregular stiffness have a greater propensity to collapse than conventional buildings because of this. The study's main goal was to better understand the soft storey effect in multi-storey structures and how to mitigate it using different strategies such adding shear walls, different kinds of bracings, viscous dampers, and stiffer columns. A G+14 storey building finite element model (FEM) has been established via ETABS software and performed Response Spectrum Analysis at three seismic zones-III, IV and V. In order to determine the best method for reducing the soft storey effect in buildings, an analysis is conducted taking into account many parameters, including storey shear, stiffness, storey drift, and storey displacement for the entire structure, as well as the responses at the soft storey level for different configurations. According to the findings, addition of a shear wall to a soft-storey building increases storey shear while reducing maximum displacement and storey drift. The first floor of the structure (soft storey) exhibits the largest reduction in displacement (79.29%) and storey drift (79.3%) when shear walls are incorporated at the corners. At the first storey level, there is also a 33.11% increase in base shear, and the stiffness of the structure increases by 6.5 times compared to a soft storey building. Adding a shear wall tends to reduce the soft storey building's maximum displacement and storey drift by 25.27% and 59.28%, respectively. The soft storey building's maximum storey shear rises by 33.38%. When it comes to seismic performance, a soft-storey building with a shear wall performs better than other soft-storey mitigation techniques.

Keywords

Soft Storey, Response Spectrum Analysis, Shear wall; Bracings, Viscous Damper, Stiffer Columns

References

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