Analysis and comparison of two different configurations of external dissipative systems

Laura Gioiella, Enrico Tubaldi, Fabrizio Gara, Lugino Dezi, Andrea Dall'Asta

Research output: Contribution to journalSpecial issue

1 Citation (Scopus)

Abstract

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.

LanguageEnglish
Pages164-169
Number of pages6
JournalProcedia Engineering
Volume199
DOIs
Publication statusPublished - 12 Sep 2017
EventX International Conference on Structural Dynamics, EURODYN 2017 - Rome, Italy
Duration: 10 Sep 201713 Sep 2017

Fingerprint

Towers
Chemical activation
Fluids
Steel

Keywords

  • external seismic retrofit
  • linear viscous dampers
  • mass proportional damping
  • passive seismic protection
  • rocking motion

Cite this

Gioiella, Laura ; Tubaldi, Enrico ; Gara, Fabrizio ; Dezi, Lugino ; Dall'Asta, Andrea. / Analysis and comparison of two different configurations of external dissipative systems. In: Procedia Engineering. 2017 ; Vol. 199. pp. 164-169.
@article{dc5d11f4343149e6bf3a3934e05fb577,
title = "Analysis and comparison of two different configurations of external dissipative systems",
abstract = "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.",
keywords = "external seismic retrofit, linear viscous dampers, mass proportional damping, passive seismic protection, rocking motion",
author = "Laura Gioiella and Enrico Tubaldi and Fabrizio Gara and Lugino Dezi and Andrea Dall'Asta",
year = "2017",
month = "9",
day = "12",
doi = "10.1016/j.proeng.2017.09.207",
language = "English",
volume = "199",
pages = "164--169",
journal = "Procedia Engineering",
issn = "1877-7058",

}

Analysis and comparison of two different configurations of external dissipative systems. / Gioiella, Laura; Tubaldi, Enrico; Gara, Fabrizio; Dezi, Lugino; Dall'Asta, Andrea.

In: Procedia Engineering, Vol. 199, 12.09.2017, p. 164-169.

Research output: Contribution to journalSpecial issue

TY - JOUR

T1 - Analysis and comparison of two different configurations of external dissipative systems

AU - Gioiella, Laura

AU - Tubaldi, Enrico

AU - Gara, Fabrizio

AU - Dezi, Lugino

AU - Dall'Asta, Andrea

PY - 2017/9/12

Y1 - 2017/9/12

N2 - 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.

AB - 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.

KW - external seismic retrofit

KW - linear viscous dampers

KW - mass proportional damping

KW - passive seismic protection

KW - rocking motion

UR - http://www.scopus.com/inward/record.url?scp=85029900660&partnerID=8YFLogxK

UR - https://www.eurodyn2017.it/

U2 - 10.1016/j.proeng.2017.09.207

DO - 10.1016/j.proeng.2017.09.207

M3 - Special issue

VL - 199

SP - 164

EP - 169

JO - Procedia Engineering

T2 - Procedia Engineering

JF - Procedia Engineering

SN - 1877-7058

ER -