Ground motions and scaling techniques for 3D performance based seismic assessment of an industrial steel structure

Abstract

This paper presents a performance-based earthquake assessment of an industrial structure, aiming at identifying suitable techniques to select and scale natural ground motions for 3D analysis and improve the structural response prediction of complex structures. To this end, an industrial structure characterized by the presence of large masses placed at a significant height and of different horizontal resisting systems, such as moment resisting frames, inverted V bracings and diagonal bracings, is investigated. The structural response is computed via both nonlinear static and dynamic analyses. Two sets of natural ground motions, one coherent with the Uniform Hazard Spectrum and one with the Conditional Mean Spectrum, are selected and scaled with different criteria. The efficiency and sufficiency of each selected ground motion set and scaling criteria is assessed through a probabilistic treatment of the key engineering demand parameters. Results indicate that for the structure analyzed, characterized by different behavior in the two orthogonal directions, the use of more complex ground motions selection and scaling techniques does not improve necessarily the reliability of results or allow the use of a lower number of ground motion recordings

Influence of repairable bolted dissipative beam splices (structural fuses) on reducing the seismic vulnerability of steel-concrete composite frames

“…This improves the sustainability of these types of structures, eliminating the demolition risk after strong earthquake events. This aspect was indeed one of the long-term objectives of European Union in the steel construction sector (European Commission, 2017 [51]). From the benchmark numerical analysis, it is seen that the main objective has been achieved concentrating the seismic damage in the fuses, the rest of the structure remaining essentially elastic.…”

Structural and economical performance of reinforced concrete frames with Dual‐Phase and TempCore® steel rebars in uncorroded and corroded conditions

“…For the execution of nonlinear incremental dynamic analyses (IDA) 29 , accelerograms were selected basing on the dynamic features of the structure; conditional spectrum as a target spectrum for ground motion (GM) selection was used (Morelli et al 30 ) and defined basing on SHARE seismic hazard 31,32 (Šebenik and Dolšek, 33 ), where the mean magnitude and mean distance were obtained from disaggregation of spectral acceleration corresponding to a return period of 2475 years, the first vibration period () of and location of a structure. Ten GMs of events with magnitude in the range 4.5–7.0 and source‐to‐site distance between 5 and 50 km were selected; the average response spectrum associated to selected GMs was in good agreement with the design spectrum adopted for case study buildings (Figure 7).…”

Seismic Retrofit of an Existing RC Building With Isolation Devices Applied at Base

“…It is worth to note that in order to not alter the GMs characteristics and to improve the interpretability of results no scale factor has been adopted in obtaining the spectrum-compatibility. Therefore, in the analyses performed the GMs considered are unscaled, as suggested in Morelli et al (2018). Finally, Figure 11 shows the details of each couple selected of GMs, also plotted in the form of horizontal combined spectrum with the SRSS rule.…”