Study of seismic orientation of structure with bi-directional response analysis in the vicinity of branched fault earthquake rupture

Dwivedi, Adarsh and Karthik Reddy, K.S.K. and Somala, S N (2022) Study of seismic orientation of structure with bi-directional response analysis in the vicinity of branched fault earthquake rupture. Structures, 37. pp. 613-623. ISSN 2352-0124

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Ground motions originating from earthquakes on complex fault systems have a wide range of spatial variability whose understanding is limited as a result of scarcity in near-field ground motions. The objective of this study is to employ computational seismology by using state of the art tool (SPECFEM3D) in simulating and understanding dynamic earthquake ruptures in a branch fault system. Employing physics-based dynamic rupture simulations not only aids to model complicated fault systems but also allows to gather ground motion data at the desired coordinates which can then be extended to evaluate the response of structures near the fault zone for various earthquake scenarios. In this study, synthetic ground motions are generated for two different cases of rupture propagation by modeling dynamic earthquakes for the left-lateral and right-lateral branched faults systems. In both cases, nucleation initiates in the main fault but differs in the continuous rupture that propagates along (i) the main fault (case-1), and (ii) the branch fault (case-2). Simulated time histories are extracted at certain stations for the near-field as well as far-field and a vectorization based on the orientation of the building is applied. Further, bi-directional responses and Maximum-Radial Spectral Acceleration (Max-RSA) of the structure are produced to study the importance of building orientation with respect to fault line for both rupture scenarios. It is observed that the influence of orientation is minimal for near-field stations (Set-A), perceptible for far-field stations (Set-B) and quite predominant for far-field stations along the strike of the branch fault (Set-C). © 2022 Institution of Structural Engineers

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IITH Creators:
IITH CreatorsORCiD
Somala, S N
Item Type: Article
Additional Information: The authors thank the two anonymous reviewers, whose comments and suggestions have significantly improved the manuscript. This study is partly funded by the Ministry of Earth Sciences (MoES), India under the grant number MoES/P.O.(Seismo)/I(304)/2016. Funding from the Science Education and Research Board (SERB) through grant number ECR/2015/000415 is also greatly acknowledged.
Uncontrolled Keywords: Bi-directional response; Dynamic ruptures; Max-RSA; Rupture propagation; Slip weakening
Subjects: Civil Engineering
Civil Engineering > Earthquake Engineering
Divisions: Department of Civil Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 20 Jul 2022 11:38
Last Modified: 20 Jul 2022 11:38
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