The damped cable system for seismic protection of frame structures — Part I: General concepts, testing and modeling

Sorace, Stefano; Terenzi, Gloria

doi:10.1002/eqe.1166

Cited by 30 publications

(12 citation statements)

References 12 publications

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“…(15) through (19). The preparation of the anchorage zones of the base plates of the diagonal braces at the foot of a column are shown in Fig.…”

Section: Fv-dissipated Energymentioning

confidence: 99%

Dissipative Bracing-Based Seismic Retrofit of R/C School Buildings

Sorace¹

2012

TOBCTJ

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A dissipative bracing system incorporating pressurized fluid viscous spring-dampers has been studied for many years by the authors as an alternative seismic protection strategy for new and existing frame structures. As a concluding stage of this activity, a set of demonstrative case studies was examined to illustrate the enhancement of seismic performance and the economic advantages guaranteed by the system in actual design applications. The paper offers a selection of two among these case studies, both concerning retrofit interventions of reinforced concrete school buildings designed with earlier Seismic Standards editions, representative of a large stock of similar edifices built during the 1970s and earlier 1980s. The following aspects are presented and discussed in detail: the mechanical parameters, layouts and locations selected for the constituting elements of the system; the architectural refurbishment projects developed to properly incorporate the structural interventions and improve the appearance of the buildings; highlights of the installation works completed in one of the two case studies; and a synthesis of the performance assessment analyses in original and rehabilitated conditions, developed according to a full non-linear dynamic approach. The results of the analyses show a remarkable enhancement of the seismic response capacities of both structures. This allows reaching the high performance objectives postulated in the retrofit designs, with much lower costs and architectural intrusion as compared to traditional rehabilitation interventions designed for the same objectives.

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“…(15) through (19). The preparation of the anchorage zones of the base plates of the diagonal braces at the foot of a column are shown in Fig.…”

Section: Fv-dissipated Energymentioning

confidence: 99%

Dissipative Bracing-Based Seismic Retrofit of R/C School Buildings

Sorace¹

2012

TOBCTJ

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“…The FV spring-dampers incorporated in the VDB system, detailed in [17][18][19][20][21][22], produce their damping action by a compressible silicone fluid flowing through the thin annular space found between the piston head and the internal casing ( Figure 10). The inherent re-centering capacity of the devices is ensured by the pressurization of the fluid imposed upon manufacturing by means of a static pre-load force.…”

Section: Vdb Design Solutionmentioning

confidence: 99%

Viscous Dissipative, Ductility-Based and Elastic Bracing Design Solutions for an Indoor Sports Steel Building

Sorace¹,

Terenzi²,

Bertino³

2012

Volume 8 Number 3

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Three bracing solutions are developed for an indoor sports facility representative of the most recent architectural design trends for recreational and commercial steel buildings. A viscous-dissipative bracing system incorporating pressurized fluid viscous spring-dampers is assumed as anti-seismic technology for the first solution. Thanks to the protective capacities of this technology, non-structural and structural operational performance levels are pursued for the building up to the maximum considered design earthquake level. A traditional concentric X-shaped configuration is selected for the second and third solution, which differ from each other in the design strategy adopted. In the first case, a ductility-based solution is chosen, by adopting a basic behaviour factor equal to 4, reduced by 20% to take into account the structural irregularity caused by the eccentric position of the intermediate floor of the building. In the second case, the same performance objectives as originally formulated for the viscous-dissipative design hypothesis are assumed, fixing the behaviour factor at 1. The resulting dimensions of the members, and the total weight and cost of the steel structure are compared for the three layouts. A substantially higher seismic performance at all normative design levels at a comparable cost; and a cut in the cost by about 50%, with an improved look of the structure due to the remarkably greater slenderness of the constituting members, come out for the viscous-dissipative bracing design as compared to the ductility-based and elastic X-bracing solutions, respectively.Keywords: Steel structures, Seismic protection, Fluid viscous dissipative bracing, Damping, Concentric bracing, Ductility-based design, Elastic design INTRODUCTIONThe most recent trends in the design of steel buildings favour transparency, lightness and aerial effects, which are obtained by including large glazed façades, by increasing the free spans of floors and roofs, and by implementing innovative architectural shapes and finishes. These emerging trends compel structural designers to reduce further the architectural impact of load-bearing systems, while at the same time meeting the high performance levels required by the latest generation of Technical and Seismic Standards on steel construction.A satisfactory balance between the issues of high structural performance and limited architectural impact is a very demanding challenge for structural engineers, especially for buildings situated in medium-to-high seismicity zones. The normative solution to this problem was traditionally represented by the design of dissipative structures, i.e. structures that are able to dissipate energy by means of their ductile hysteretic (plastic) behaviour. According to this ductility-based design approach, the seismic forces for the verifications at the ultimate limit states (i.e. Life Safety -LS and Collapse Prevention -CP performance levels) are computed by scaling relevant pseudo-acceleration response spectra by behaviour factors proport...

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“…In order to overcome these limitations, an alternative seismic isolation strategy was recently devised by the first two authors [13], within a research line dedicated to the seismic assessment and advanced protection of high-value finishes [14,15], as well as of contents, plants and non-structural components [16][17][18][19]. The proposed strategy consists in incorporating an isolation system at the base of the bearing floor where the artworks are located, when the seismic isolation of the entire building -which would allow to protect the contents too -is not possible or too costly, as is the case of several museums and historical structures.…”

Section: Introductionmentioning

confidence: 99%