Effects of seismic sequences on masonry structures. (1st July 2018)

• Record Type: Journal Article
• Authors: Rinaldin, Giovanni; Amadio, Claudio
• Is Part Of: Engineering structures. Volume 166(2018)
• Page Start: 227
• Page End: 239
• Publication Date: 2018-07-01
• Subjects: Repeated earthquake ground motions -- Hysteretic behaviour -- Masonry structures -- Behaviour factor -- Non-linear SDOF -- Damage index; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2018.03.092
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: The paper investigates the effects of seismic sequences in unreinforced masonry. The damage evolution is investigated through the Park & Ang index. Corrections to behaviour factors are proposed. Consistent results were found with the sequence of Central Italy (2016). Abstract: In this work, the seismic behaviour of UnReinforced Masonry (URM) structures under repeated earthquakes is investigated. Such analysis is carried-out by using a purposely-developed non-linear software that describes the hysteretic behaviour of a masonry panel through an appropriate phenomenological law. First, results obtained from a series of non-linear dynamic analyses on a single degree of freedom (SDOF) system, which represents the typical cyclic response of an unreinforced masonry structure, are presented. The seismic sequences adopted for the analysis are taken from international databases and are selected on the base of the Peak Ground Acceleration (PGA) of the events following the mainshock. The selected aftershocks have a PGA equal or almost similar to the mainshock, in such a way to significantly influence of the required ductility for the analysed system and, consequently, on the damage index used to quantify the structural degradation. The obtained results are presented in terms of inelastic response at constant ductility or strength. On the base of the collected results, modifications on the behaviour factors commonly adopted in seismic design are proposed. Finally, a SDOF system representing a typical masonry structure subjected to the seismic sequence of Central Italy (2016) has been analysed with the aim to highlight the damage evolution.