GNGTS 2021 - Atti del 39° Convegno Nazionale

355 GNGTS 2021 S essione 2.2 THE ONLINE GRAPHICAL USER INTERFACE OF REXELWEB FOR THE SELECTION OF ACCELEROGRAMS FROM THE ENGINEERING STRONG MOTION DATABASE (ESM) S. Sgobba, C. Felicetta, E. Russo, M. D’Amico, G. Lanzano, F. Pacor, L. Luzi, R. Baraschino*, G. Baltzopoulos*, I. Iervolino* Istituto Nazionale di Geofisica e Vulcanologia (INGV), Milan, Italy * Università degli Studi Federico II, Naples, Italy Selection and spectrum-matching of ground-motion records is a key issue for dynamic analysis of structures performed by practitioners worldwide. In fact, this is an explicit requirement of several seismic building codes, such as the Italian code and Eurocode 8 (CEN 2003, CS.LL.PP. 2018). Although these accelerograms can be in principle artificial, that is obtained via random vibration theory or simulating seismic rupture and wave propagation, the recent increasing availability of real strong-motion records in online repositories, has shifted the attention of the community mostly towards the use of natural accelerograms (e.g., Bommer and Acevedo, 2004; Iervolino and Cornell, 2005). This has, in turn, led to the development and dissemination of dedicated software for selecting these records from the databases. One of the most recognized attempts of providing computer-aided selection of accelerograms, compliant (on average) with design spectra, was the standalone program REXEL (Iervolino et al., 2010) still available at the website of the Rete dei Laboratori Universitari di Ingegneria Sismica (ReLUIS – www.reluis.it ) which is based on static waveform datasets; i.e. the European Strong-motion Database (ESD) updated up to 2007, ITACA ( Italian Accelerometric Archive ; 2010 version) and SIMBAD datasets (Smerzini and Paolucci, 2011). More recently, further REXEL-based tools (i.e., based on the same source-code) have been developed, mostly in order to extend the database from which records can be selected: (i) REXELite (Iervolino, 2011) that implemented some basic functionalities of REXEL within the old web-interface of the daily-updated pan-European Engineering Strong Motion database (ESM, http://esm.mi.ingv.it ; Luzi et al., 2016); (ii) REXEL-DISP to select record sets compatible with displacement spectra (Smerzini et al. 2014); and (iii) the recent application REXELweb v1.0 (Sgobba et al., 2019) which is shared through a set of web-services (https://esm-db. eu/#/data_and_services/web_services) to the new ESM and ITACA websites (D’Amico et al. 2021; Lanzano et al. 2021). Although the latter provides computer-friendly access to data, it is strongly limited by the lack of a dynamic user-interface, thus being mostly accessible to advanced users. ToenhanceREXELweb, agraphical user interfacehas beendevelopedandmadeavailableonline (https://esm-db.eu/#/data_and_services/tools/rexel ). It has several advantages and novelties compared to existing tools: (i) a guided web-interface that makes the application user-friendly; (ii) integration within the ESMwebsite, which provides both a continuous availability of new high- quality records and a modern and effective front-end for user needs; (iii) the implementation of all of REXEL’s options, with novel features for the definition of the target spectrum. The program is able to search for spectrum-compatible combinations of 1-, 2- or 3-component ground-motion records, compatible - on average - with the assigned target spectrum. It addresses the input options specified by the user through the web-interface and returns data from the ESM database by invoking automatically the set of underlying Web-Services (WSs), specifically developed for REXELweb analysis. The three main steps of the selection procedure are similar to those of the other tools of the REXEL family: