Stochastic analysis of linear structural systems under spectrum and site intensity compatible fully non-stationary artificial accelerograms. Issue 126 (November 2019)

• Record Type: Journal Article
• Authors: Alderucci, T.; Muscolino, G.; Urso, S.
• Is Part Of: Soil dynamics and earthquake engineering. Issue 126(2019)
• Publication Date: 2019-11
• Subjects: Random vibration -- Artificial accelerograms -- Spectrum compatibility -- Site compatibility; Soil dynamics -- Periodicals; Earthquake engineering -- Periodicals; Sols -- Dynamique -- Périodiques; Génie parasismique -- Périodiques; 624.176205
• DOI: 10.1016/j.soildyn.2019.105762
• Languages: English
• ISSNs: 0267-7261

Abstract

Abstract: In seismic areas one of the most important problems for engineers is to characterize in the most correct way the future ground motion accelerations. Building codes allow the practitioners to use artificial time-history compatible with a target pseudo-acceleration spectrum. The spectrum compatible seismic accelerations are usually represented by samples of stationary processes, even if it is well know that the ground motion accelerations should be modelled as samples of fully non-stationary processes. Moreover, the spectrum compatible accelerograms are not able to catch the site intensity of seismic events. In this paper methods able to catch the main features of recorded earthquakes, generating both spectrum compatible fully non-stationary accelerograms and artificial fully non-stationary accelerograms compatible with the site intensity of recorded accelerograms, are presented. In order to quantify the influence of the input model on the structural response, several numerical applications will be carried out and the results will be compared with the Monte Carlo simulation method. Highlights: The stochastic analysis of structures subjected to fully non-stationary seismic excitations is addressed. A method to generate spectrum compatible fully non-stationary stochastic processes is proposed. A procedure to define fully non-stationary site-compatible seismic excitations is described. The stochastic reliability assessment of structures subjected to fully non-stationary input processes is performed. Numerical applications evidence drawbacks of stationary spectrum compatible seismic excitations.