The Effect of Ground Motion Selection Methods for Seismic Design of Tall Buildings: A Case Study of Mandalay City

Yan Naung  KO; Teraphan  ORNTHAMMARATH

doi:10.48048/wjst.2020.10736

Authors

Yan Naung KO Department of Civil and Environmental Engineering, Faculty of Engineering, Mahidol University, Nakorn Pathom 73170, Thailand
Teraphan ORNTHAMMARATH Department of Civil and Environmental Engineering, Faculty of Engineering, Mahidol University, Nakorn Pathom 73170, Thailand

DOI:

https://doi.org/10.48048/wjst.2020.10736

Keywords:

Pulse-like ground motion, Near-fault earthquake, Tall Building Initiative (TBI), Intensity measure, Response history analysis, Mandalay

Abstract

The near-fault earthquakes ground motion usually observed a few kilometers away from the active faults generally contains high energetic velocity pulses as a consequence of directivity effects. Mandalay city is located 8 km away from the Sagaing fault, and the comparative study is conducted to evaluate the structural response of 3 different types of Reinforced Concrete buildings - 4-story, 10-story, and 16-story buildings, respectively. These buildings are subjected to bi-directional ground motions selected from both far-field and pulse-like near-fault earthquakes. The far-field earthquakes produce less seismic demand on the buildings when compared to the near-fault earthquakes, where the ratio of the fundamental period of the building to the pulse period is significant. Comparing 2 ground motion selection and scaling methods of Tall Building Initiative guidelines - TBI (2010) and TBI (2017), the latter approach provides a more meaningful definition of intensity measure and allows reducing some conservatism. The structural response obtained from the design Equivalent Lateral Force (ELF) and Response Spectrum Analysis (RSA) is compared with the code-based linear Response History Analysis (RHA) results.

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