Title: Characterisation of design spectra for vertical ground motion

Authors: Ravi Kanth Sriwastav; Dhiman Basu

Addresses: Department of Civil Engineering, Indian Institute of Technology Gandhinagar, India ' Department of Civil Engineering, Indian Institute of Technology Gandhinagar, India

Abstract: Design recommendation on vertical ground motion offers dual challenges, namely the spectral shape and conditional peak-ground-acceleration. One way of recommending the vertical spectra is through V/H spectrum that can be multiplied with design horizontal spectrum. Seismic code recommendations do not explicitly account for the possible effects of magnitude (except EC8 Part-1) and epicentral distance. This paper is aimed to assess the possible effects of magnitude, epicentral distance and average shear wave velocity (representing the soil sites) on resulting V/H spectra. About 6,000 strong motion events are considered for this purpose. Resulting V/H and vertical spectra conditioned to the horizontal spectra are compared with the seismic code recommendations and prior-art. Also explored is the feasibility of possible recommendations on V/H spectra contingent on magnitude, epicentral distance and average shear wave velocity. Finally, the framework is assessed with respect to a strong motion event which was not included in the developmental database.

Keywords: ground motion characterisation; vertical design spectra; V/H spectra.

DOI: 10.1504/IJEIE.2022.122818

International Journal of Earthquake and Impact Engineering, 2022 Vol.4 No.1, pp.1 - 29

Received: 23 Dec 2019
Accepted: 07 May 2020
Published online: 13 May 2022 *

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