Modal Properties and Seismic Response of Existing Building Retrofitted by External Bracings With Viscous Dampers

Gioiella, Laura; Tubaldi, Enrico; Gara, Fabrizio; Dall’Asta, Andrea

doi:10.7712/100016.2171.10790

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…This consists of an external stiff braced structure rigidly linked to the frame at floor levels and connected at the foundations by a hinge (Figure 1(b)). Fluid viscous dampers (FVDs) placed at the base of the external frame and activated by its rocking motion provide energy dissipation to the system, whereas the high stiffness of the braced frame induces a uniform distribution of the interstorey drifts of the protected frame [19].…”

Section: Introductionmentioning

confidence: 99%

Stochastic Seismic Analysis and Comparison of Alternative External Dissipative Systems

Gioiella

Tubaldi

Gara

et al. 2018

Shock and Vibration

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This paper deals with the seismic retrofit of existing frames by means of external passive dissipative systems. Available in different configurations, these systems allow high flexibility in controlling the structural behaviour and are characterized by some feasibility advantages with respect to dissipative devices installed within existing frames. In particular, this study analyzes and compares the performances of two external solutions using linear viscous dampers. The first is based on the coupling of the building with an external fixed-based steel braced frame by means of dampers placed horizontally at the floor levels. The second is an innovative one, based on coupling the building with a "dissipative tower," which is a steel braced frame hinged at the foundation level, and activating the dampers through its rocking motion. The effectiveness of the two solutions is evaluated and compared by considering a benchmark existing reinforced concrete building, employing a stochastic dynamic approach, under the assumption of linear elastic behaviour for the seismic performance evaluation. This allows efficiently estimating the statistics of many response parameters of interest for the performance assessment and thus carrying out extensive parametric analyses for different properties of the external systems. The study results provide useful information regarding the design and the relative efficiency of the proposed retrofit solutions.

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Section: Introductionmentioning

confidence: 99%

Stochastic Seismic Analysis and Comparison of Alternative External Dissipative Systems

Gioiella

Tubaldi

Gara

et al. 2018

Shock and Vibration

Self Cite

View full text Add to dashboard Cite

show abstract

Analysis and comparison of two different configurations of external dissipative systems

Gioiella

Tubaldi

Gara

et al. 2017

Procedia Engineering

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This paper deals with the seismic protection of existing buildings, especially r.c. frame ones, by means of external passive dissipative systems. These type of systems provide larger flexibility in controlling the structural behavior, and some feasibility advantages, but their efficiency in terms of performance still need to be proven. In particular, this study analyzes and compares the performance of two external solutions using linear fluid viscous dampers (FVDs) for the seismic upgrading of an existing benchmark structure, the Van Nuys building. The first arrangement is a recent solution, known as "Dissipative Tower", which exploits the rocking motion of a steel truss hinged at the foundation level for the dampers activation; the second one consists in coupling the building with an external stiff contrasting structure, where the dampers are located horizontally at the storey level. First, a state space formulation of the problem, based on the assumption of linear elastic behavior for both the existing frame and the external dissipative structures, is presented in general terms. The proposed formulation, suitable for both the external arrangements, allows to evaluate the influence of the dissipative solutions on the system modal properties. Successively, the performance of the two proposed external passive structures, is evaluated and compared with that of the bare existing frame, by considering important engineering demand parameters (EDPs) such as interstorey drifts, absolute accelerations and shear actions resisted by the frame and by external systems

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Modal Properties and Seismic Response of Existing Building Retrofitted by External Bracings With Viscous Dampers

Abstract: Abstract. This paper deals with the seismic protection of existing buildings using external

Cited by 2 publications

References 12 publications

Stochastic Seismic Analysis and Comparison of Alternative External Dissipative Systems

Stochastic Seismic Analysis and Comparison of Alternative External Dissipative Systems

Analysis and comparison of two different configurations of external dissipative systems

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