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Activation control extension of a design method of fluid viscous dissipative bracing systems.
- Source :
- Bulletin of Earthquake Engineering; Jun2020, Vol. 18 Issue 8, p4017-4038, 22p
- Publication Year :
- 2020
-
Abstract
- Remarkable damage to non-structural elements and sometimes to structural members was surveyed in buildings retrofitted with dissipative bracing (DB) technologies recently hit by moderate-to-medium amplitude earthquakes. Damage is a consequence of the delayed contribution of protective systems to the seismic response of the buildings, caused by too high activation forces of dissipaters. In view of this, a sizing procedure for DB systems incorporating fluid viscous (FV) spring-dampers is implemented in this study. The procedure provides a simplified version of a recently proposed energy-based design criterion, and an extension of it by including a pre-evaluation of the activation force of the FV devices with respect to the normative Serviceability Design Earthquake (SDE)-related seismic demand. The sizing procedure is applied to the retrofit design of a demonstrative case study, represented by a school built in Italy in the early 1980s. Noticeable seismic vulnerabilities of the above-ground steel structure of the building are assessed in current conditions, highlighting local unsafety conditions of the profiles constituting the reticular steel columns starting from the SDE. A retrofit intervention consisting in the installation of a DB system equipped with FV spring-dampers is presented for the steel structure, designed by applying the proposed sizing method. The final verification time-history analyses confirm the activation of the FV devices at the SDE, and the attainment of the targeted elastic structural response up to the Maximum Considered Earthquake normative level. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 1570761X
- Volume :
- 18
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Bulletin of Earthquake Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 143676822
- Full Text :
- https://doi.org/10.1007/s10518-020-00849-5