Title: A simplified procedure for the seismic safety of large and slender rigid masonry blocks

Authors: Claudia Casapulla; Paolo Jossa; Alessandra Maione

Addresses: Department of Structures for Engineering and Architecture, University of Naples Federico II, via Forno Vecchio 36, 80134, Naples, Italy ' Department of Structures for Engineering and Architecture, University of Naples Federico II, via Forno Vecchio 36, 80134, Naples, Italy ' Department of Structures for Engineering and Architecture, University of Naples Federico II, via Forno Vecchio 36, 80134, Naples, Italy

Abstract: This paper aims at finding the features of an artificial accelerogram which can be used to assess the seismic safety of large and slender rigid masonry blocks. The most important feature derives from a simple observation: well-known uncertainties on time variations of seismic actions imply that seismic risks analyses must be developed without privileging any detailed description of expected accelerograms. It follows that the best choice to build an artificial accelerogram is to represent it with sequences of instantaneous Dirac impulses and to look at its worst effects. A multiple impulse input is herein proposed, with impulses all applied right after the impact of the generic block on the ground. Intermediate impulses are then introduced to reduce the resonance effects and to cover a broad range of conditions. Approximate equations of block motion are proposed and numerical analyses are performed to highlight the most significant aspects of the proposed approach.

Keywords: instantaneous impulses; limit accelerograms; coefficient of restitution; secondary sequences; resonant effects; seismic safety; masonry blocks; earthquakes; seismic risk assessment; block motion.

DOI: 10.1504/IJEIE.2016.10004070

International Journal of Earthquake and Impact Engineering, 2016 Vol.1 No.4, pp.333 - 359

Received: 17 Sep 2016
Accepted: 14 Oct 2016

Published online: 22 Mar 2017 *

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