Seismic Protection of Frame Structures by Fluid Viscous Damped Braces

Sorace, Stefano; Terenzi, Gloria

doi:10.1061/(asce)0733-9445(2008)134:1(45)

Cited by 79 publications

(85 citation statements)

References 12 publications

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“…Extensive pseudodynamic [9,10,13] and shaking table [22] experimental campaigns on large and full-scale structures supported the technical implementation of the system and validated the analytical/numerical models and design procedures developed for its analysis and sizing.…”

Section: Introductionmentioning

confidence: 89%

“…where: c=damping coefficient; sgn(·)=signum function; |·|=absolute value; =fractional exponent, ranging from 0.1 to 0.2; F 0d =static pressurization pre-load; k 1 , k 2 =stiffness of the response branches situated below and beyond F 0d ; and R=integer exponent, set as equal to 5 [13,23,26].…”

Section: Characteristics Of Fv Devices Incorporated In the Db Systemmentioning

confidence: 99%

“…In this assembly, the static preload F 0d is imposed as an internal force to a bar linking the two elements. In order to simulate the attainment of the spring-damper strokes, the device model can be completed with a "gap" element and a "hook" element, aimed at disconnecting the device when stressed in tension, and at stopping it when the maximum displacement in compression is reached, respectively [13][14][22][23].…”

Section: Characteristics Of Fv Devices Incorporated In the Db Systemmentioning

confidence: 99%

“…The details of installation of the DB system correspond to a general layout conceived at previous steps of this research [9,10,13,14], and already applied to the test structures enquired in the experimental sections of the study [9,10,13,22]. This layout, specialized to the Bisignano building in Fig.…”

Section: Db-based Retrofit Intervention Proposalmentioning

confidence: 99%

“…Among these technologies, a special dissipative bracing (DB) system incorporating pressurized fluid viscous (FV) spring-dampers as protective devices, proved to be a very effective and economically viable retrofit strategy for R/C as well as steel frame structures [7,9,10,13,14,21,22]. Extensive pseudodynamic [9,10,13] and shaking table [22] experimental campaigns on large and full-scale structures supported the technical implementation of the system and validated the analytical/numerical models and design procedures developed for its analysis and sizing.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 89%

Section: Characteristics Of Fv Devices Incorporated In the Db Systemmentioning

confidence: 99%

Section: Characteristics Of Fv Devices Incorporated In the Db Systemmentioning

confidence: 99%

Section: Db-based Retrofit Intervention Proposalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Sorace¹

2012

TOBCTJ

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The damped cable system for seismic protection of frame structures — Part II: Design and application

Sorace

Terenzi

2011

Earthq Engng Struct Dyn

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SUMMARY The complementary sections of the studies carried out on the damped cable system, whose experimental and numerical characterization and assessment analyses are described in the companion paper, are presented herein. The first section includes a criterion for a preliminary evaluation of the section area of cables, the second branch stiffness of spring‐dampers and the mutual installation preload, and suggestions for a simplified nonlinear dynamic computation of the damping coefficient of dissipaters. A second section follows, aimed at evaluating the influence of cable layout on damped cable system performance. A numerical enquiry is developed on a four‐story and an eight‐story RC plane frame, to assess their seismic response for several shapes of cables, and determine what geometrical configurations are the best performing ones. In the third section, a demonstrative application of the protective system, represented by the seismic retrofit of a hospital building with RC structure, is offered. The characteristics of the system designed for this case study, including locations, dimensions, layouts, and technical installation details of cables and spring‐dampers, are illustrated, and the improvement of seismic performance as compared with the original conditions, is finally assessed. Copyright © 2011 John Wiley & Sons, Ltd.

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

Sorace

Terenzi

2011

Earthq Engng Struct Dyn

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SUMMARY Research studies on the damped cable system (DCS) for seismic protection of frame structures are presented in this paper and the accompanying one. This technology includes prestressed steel cables linked to pressurized fluid viscous spring‐dampers fixed to the foundation at their lower ends, and to the top floor, or one of the upper floors, at their upper ends. The cables have sliding contacts with the floor slabs, to which they are joined by steel deviators. The general characteristics of the system, as well as of the constituting spring‐dampers and cables, are initially discussed. The results of a laboratory testing campaign developed on a DCS prototype are examined, and transferred into the formulation of the finite element model of the system, conceived to be easily generated by commercial structural analysis programs. A second dynamic experimental investigation follows, concerning a pilot installation of the system on a full‐scale mock‐up building. The benefits of the protective technology are evaluated in terms of maximum displacements and accelerations, as well as of equivalent viscous damping coefficient and MDOF transmissibility ratio. Further sections of the study, including a preliminary sizing criterion of DCS, additional numerical enquiries aimed at optimizing its geometrical layout, and the application to a real case study building, are offered in the companion paper. Copyright © 2011 John Wiley & Sons, Ltd.

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Seismic Protection of Frame Structures by Fluid Viscous Damped Braces

Cited by 79 publications

References 12 publications

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

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

The damped cable system for seismic protection of frame structures — Part II: Design and application

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

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