Dependency of Response Spectra on Seismogenic depth from Finite Element Kinematic Rupture Simulation of Earthquake

Gangapogu, Venkata Kishor and Somala, S N (2017) Dependency of Response Spectra on Seismogenic depth from Finite Element Kinematic Rupture Simulation of Earthquake. Masters thesis, Indian Institute of Technology Hyderabad.

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Abstract

Ongoing research in development of design philosophies for earthquake resistant structures over the past few decades were initially based on strength and elastic analysis. Later, design ph ilosophies recognized that deformation is main parameter to consider in design following nonlinear analysis. The maximum design lateral force, for a particular earthquake, acting on structures having multiple natural time periods obtained from inelastic r esponse spectrum. Scenario earthquakes characterize the spatio - temporal evolution of rupture, which when solved together with the elastodynamic equations can give the acceleration time - history at any point on the surface. For any tectonic regime, based on past seismicity, a seismogenic depth could be defined based on the depth below which no occurrence of earthquakes was observed in the past. Fixing a certain magnitude, we prescribe the slip on a vertical fault based on statistical relations that exist in literature and simulate ground motion. The prescribed slip is varied to start from 3 km deep all the way to 43 km in intervals of 10 km. Using the simulated ground motion, we compute the fundamental entity of earthquake engineering: the response spectrum for all five cases. Earthquake resistant design of structures is mostly done to allow for large inelastic deformations, giving ductile detailing. Choosing ductility values of 2, 4, 6 and 8, this paper describes dependency of elastic and inelastic horizo ntal spectral acceleration on seismogenic depth, by considering kinematic rupture description an earthquake of Mw 6.5 on vertical strike slip fault .

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