-
Maria João Falcão SilvaMaria João Falcão SilvaPhDPhD grantgrant
holderholder FCT/LNECFCT/LNEC
INNOVATIVE ANTIINNOVATIVE ANTI --SEISMIC SYSTEMS: SEISMIC
SYSTEMS: LNEC experimental research and futureLNEC experimental
research and future
developmentsdevelopments
-
11 INTRODUCTIONINTRODUCTION
22 ANTIANTI--SEISMIC SYSTEMS: General SEISMIC SYSTEMS: General
AspectsAspects
33 LNEC EXPERIENCE IN ANTILNEC EXPERIENCE IN ANTI--SEISMIC
SEISMIC
SYSTEMSSYSTEMS
44 LNEC FUTURE DEVELOPMENTS IN ANTILNEC FUTURE DEVELOPMENTS IN
ANTI--
SEISMIC SYSTEMSSEISMIC SYSTEMS
55 CONCLUSIONSCONCLUSIONS
CONTENTS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
-
11 INTRODUCTIONINTRODUCTION
222 ANTIANTIANTI---SEISMIC SYSTEMS: General SEISMIC SYSTEMS:
General SEISMIC SYSTEMS: General AspectsAspectsAspects
333 LNEC EXPERIENCE IN ANTILNEC EXPERIENCE IN ANTILNEC
EXPERIENCE IN ANTI---SEISMIC SEISMIC SEISMIC
SYSTEMSSYSTEMSSYSTEMS
444 LNEC FUTURE DEVELOPMENTS IN ANTILNEC FUTURE DEVELOPMENTS IN
ANTILNEC FUTURE DEVELOPMENTS IN ANTI---
SEISMIC SYSTEMSSEISMIC SYSTEMSSEISMIC SYSTEMS
555 CONCLUSIONSCONCLUSIONSCONCLUSIONS
CONTENTS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
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> Increasing in the research of innovative
anti-seismicsystems
> Increasing concern with the achievement of solutions
thatminimize the effect of the dynamic actions (wind
andearthquakes)
> Increasing concern of the responsibles
(constructioncompanies, civil protection, government and final
users) for questions related with the reduction/mitigation of
dinamicactions
> Search for a good relation cost-benefit and easy
applicationdevices
INTRODUCTION
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
-
111 INTRODUCTIONINTRODUCTIONINTRODUCTION
22 ANTIANTI--SEISMIC SYSTEMS: General SEISMIC SYSTEMS: General
AspectsAspects
333 LNEC EXPERIENCE IN ANTILNEC EXPERIENCE IN ANTILNEC
EXPERIENCE IN ANTI---SEISMIC SEISMIC SEISMIC
SYSTEMSSYSTEMSSYSTEMS
444 LNEC FUTURE DEVELOPMENTS IN ANTILNEC FUTURE DEVELOPMENTS IN
ANTILNEC FUTURE DEVELOPMENTS IN ANTI---
SEISMIC SYSTEMSSEISMIC SYSTEMSSEISMIC SYSTEMS
555 CONCLUSIONSCONCLUSIONSCONCLUSIONS
CONTENTS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
-
ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
Anti-seismic systems
Passive Active Hybrid Semi-Active
Seismic Isolation Energy Dissipators
Metallic Dampers
Friction Dampers
Viscoelastic Dampers
Viscous Fluid Dampers
Tuned Mass Dampers
Tuned Liquid Dampers
Smart Materials
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ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
Anti-seismic systems
Passive Active Hybrid Semi-Active
Seismic Isolation
Based on the possibility of supressing theconnections in the
horizontal plan, between the structure and the foundationsoil
(horizontal movement of the structureindependent of the soil’s
horizontal movement)
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ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
Anti-seismic systems
Passive Active Hybrid Semi-Active
Energy Dissipators
Specially designed for dissipating energy, while thestructures
in which are included present deformation
Excitation Structure Response
ED
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ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
Anti-seismic systems
Passive Active Hybrid Semi-Active
Energy Dissipators
Metallic Dampers
Friction Dampers
Viscoelastic Dampers
Viscous Fluid Dampers
Tuned Mass Dampers
Tuned Liquid Dampers
Shape Memory Alloys
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ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
Anti-seismic systems
Passive Active Hybrid Semi-Active
These devices, based on the data obtained through the constant
monitoringof the structure, are able to react against the movements
imposed by theseismic action
Excitation Structure Response
Sensors Control Computer Sensors
Control Actuator
-
ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
Anti-seismic systems
Passive Active Hybrid Semi-Active
Combination of active and passive devices. It is observed
theminimization of the restraints and limits related with each
oneof the devices working alone.
Excitation Structure Response
Sensors Control Computer Sensors
Control Actuator
PD
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ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
Anti-seismic systems
Passive Active Hybrid Semi-Active
Belong to a certain class of active devices inwhich the external
energy requests are verylow. Present the great adaptability of
theactive devices and the great fiability of thepassive
devices.
Excitation Structure Response
Sensors Control Computer Sensors
Control Actuator
PD
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111 INTRODUCTIONINTRODUCTIONINTRODUCTION
222 ANTIANTIANTI---SEISMIC SYSTEMS: General SEISMIC SYSTEMS:
General SEISMIC SYSTEMS: General AspectsAspectsAspects
33 LNEC EXPERIENCE IN ANTILNEC EXPERIENCE IN ANTI--SEISMIC
SEISMIC
SYSTEMSSYSTEMS
444 LNEC FUTURE DEVELOPMENTS IN ANTILNEC FUTURE DEVELOPMENTS IN
ANTILNEC FUTURE DEVELOPMENTS IN ANTI---
SEISMIC SYSTEMSSEISMIC SYSTEMSSEISMIC SYSTEMS
555 CONCLUSIONSCONCLUSIONSCONCLUSIONS
CONTENTS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
-
>> ECOEST II (U. ECOEST II (U. BasilicataBasilicata, ,
ItalyItaly))
��TITLE:TITLE: RC frames reinforced with energy dissipation
devices
ooOBJECTIVES:OBJECTIVES: Study the effectiveness of certain
passive control techniques applied to the rehabilitation of
existing reinforced concrete structures�DESCRIPTION OF THE
EXPERIMENTAL PROGRAM:
� Two models of a 4 floor spatial span built at scale (1:4) and
designed without specific seismic resistance (vertical loads)
according to the Italian regulation prior to 1970
� Seismic tests of reinforced concrete structures, strengthened
with bracing systems (energy dissipation devices included)
LNEC EXPERIENCE IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
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>> ECOEST II (U. ECOEST II (U. BasilicataBasilicata, ,
ItalyItaly))
��TITLE:TITLE: RC frames reinforced with energy dissipation
devices
ooBRACING SYSTEMSBRACING SYSTEMS
�Metallic braced elements with energy dissipation devices
(metallic dampers and shape memory alloys) placed in the initial RC
structure in different levels and directions
�According to the larger dimension (x direction) the bracing
elements were diagonally disposed one by floor in alternate spans.
In y direction too
LNEC EXPERIENCE IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
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>> ECOEST II (U. ECOEST II (U. BasilicataBasilicata, ,
ItalyItaly))
��TITLE:TITLE: RC frames reinforced with energy dissipation
devices
ooBRACING SYSTEMSBRACING SYSTEMS
LNEC EXPERIENCE IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
Direzione X Direzione Y
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>> ECOEST II (U. ECOEST II (U. BasilicataBasilicata, ,
ItalyItaly))
��TITLE:TITLE: RC frames reinforced with energy dissipation
devices
ooBRACING SYSTEMS BRACING SYSTEMS –– MetallicMetallic
DampersDampers
LNEC EXPERIENCE IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
��Metallic elements Metallic elements
with steel dissipative with steel dissipative
units (device units (device
composed of four composed of four
double mild steel double mild steel
layers with a certain layers with a certain
shape and variable shape and variable
dimensions) in the dimensions) in the
different floors and different floors and
directions, fixed to directions, fixed to
the brace elementthe brace element
��Energy dissipation Energy dissipation
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>> ECOEST II (U. ECOEST II (U. BasilicataBasilicata, ,
ItalyItaly))
��TITLE:TITLE: RC frames reinforced with energy dissipation
devices
ooRESULTS RESULTS –– MetallicMetallic DampersDampers
LNEC EXPERIENCE IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
�� High capacity of energy High capacity of energy
dissipation by plastic dissipation by plastic
deformation of steel deformation of steel
without loss of rigidity without loss of rigidity
or strength of the or strength of the
bracing elementbracing element
�� Dissipation mechanism Dissipation mechanism
is a result of the is a result of the
inelastic deformation of inelastic deformation of
the metalthe metal Asymmetrical masses
Symmetrical masses
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>> ECOEST II (U. ECOEST II (U. BasilicataBasilicata, ,
ItalyItaly))
��TITLE:TITLE: RC frames reinforced with energy dissipation
devices
ooBRACING SYSTEMS BRACING SYSTEMS –– ShapeShape MemoryMemory
AlloysAlloys
LNEC EXPERIENCE IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
��Use of metallic Use of metallic
leagues with form leagues with form
memory (energy memory (energy
dissipation dissipation
characteristics and characteristics and
capacity of recovery capacity of recovery
the elastic rigidity)the elastic rigidity)
��Metallic elements Metallic elements
associated to the associated to the
wire device in nickelwire device in nickel--
titanium (good titanium (good
durability, high durability, high
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>> ECOEST II (U. ECOEST II (U. BasilicataBasilicata, ,
ItalyItaly))
��TITLE:TITLE: RC frames reinforced with energy dissipation
devices
ooRESULTS RESULTS –– ShapeShape MemoryMemory AlloysAlloys
LNEC EXPERIENCE IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
�� Considerable dissipating ability, Considerable dissipating
ability,
being notable the recovery of being notable the recovery of
elastic characteristics of the elastic characteristics of
the
materials usedmaterials used
�� After a high number of cycles with After a high number of
cycles with
significant dissipation, the bracing significant dissipation,
the bracing
elements practically do not show elements practically do not
show
permanent displacements permanent displacements
(recovering in the beginning of (recovering in the beginning
of
each new cycle the rigidity and each new cycle the rigidity
and
the initial elastic resistance)the initial elastic
resistance)
Symmetrical masses
Asymmetrical masses
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>> NEFOREEE2 NEFOREEE2
��TITLE:TITLE: Controlled Testing in the Non-Linear Range
ooOBJECTIVESOBJECTIVES
�� StudyStudy ofof thethe behaviourbehaviour ofof twotwo
differentdifferent typestypes ofof
energyenergy dissipationdissipation devicesdevices
((viscoelasticviscoelastic dampersdampers andand
viscousviscous fluidfluid dampersdampers))
ooGeometryGeometry ofof thethe modelsmodels
�� BracingBracing systemssystems (K (K andand X X shapeshape) )
allowingallowing thethe
placementplacement ofof passivepassive dissipationdissipation
devicesdevices andand a a
natural natural frequencyfrequency range range inin
accordanceaccordance withwith thethe ST ST
andand RWRW
�� 3D 3D FrameFrame: 3m longitudinal, : 3m longitudinal, 2.45m
2.45m transversetransverse, 4.5m , 4.5m
de de columncolumn heightheight andand 3.0m 3.0m betweenbetween
slabsslabs
LNEC EXPERIENCE IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
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>> NEFOREEE2 NEFOREEE2
��TITLE:TITLE: Controlled Testing in the Non-Linear Range
ooGeometryGeometry ofof thethe modelsmodels
LNEC EXPERIENCE IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
315
0
Ø13
250
250250
140
75
110
125 125
125
635
250 250
3400
2900
250250
Ø13
125
125
250 250
125140
125
50
75
90
180
125
125
351
252
50
250
166
0
293
0
635
250
110
110
510
2900
2160
3180
35
257
0
250
250
250
125
250
250
125
125
510
110
25 35
2542
25
3060
75390
5535
125125125
125
27,
5
75
27,
5
125125 125
3000
3400
2900
125125
125125
125 125125 125
125 125125125
125125 125
12575
Ø13
262
12
300
12
50
65
2570
1693
76 180 141
25
125
201
262
338
490
1693
262
3545
100
35
160
400
35
25 1000
25
100
12
300
01
500
125125
125
27,
52
7,5 35
125125
125125 125
3150
2750
2570
125125
125125
125 125125 125
12535
125125
125125
Ø13
2.2
50
4.5
90
4.5
76
125
125
125
250
125
-
>> NEFOREEE2 NEFOREEE2
��TITLE:TITLE: Controlled Testing in the Non-Linear Range
ooDorkaDorka DissipationDissipation DevicesDevices
LNEC EXPERIENCE IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
��DevelopedDeveloped byby SchmidtSchmidt
andand DorkaDorka
��Innovative device with Innovative device with
a steel squared tubular a steel squared tubular
section with the section with the
dissipation mechanism dissipation mechanism
based in the based in the elastoelasto--
plastic plastic behaviourbehaviour of of
steelsteel
��EasyEasy replacementreplacement ofof
thethe devicedevice andand
reproductionreproduction ofof thethe
A8
-
>> NEFOREEE2 NEFOREEE2
��TITLE:TITLE: Controlled Testing in the Non-Linear Range
ooJarrettJarrett DissipationDissipation DevicesDevices
LNEC EXPERIENCE IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
��CurrentCurrent industrial industrial
devicedevice
��EnergyEnergy dissipationdissipation
basedbased inin thethe
compressioncompression ofof a a
viscovisco--elasticelastic silicone silicone
fluidfluid
��AllowAllow thethe dissipationdissipation
ofof a a partpart ofof thethe kinetickinetic
energyenergy generatedgenerated
duringduring a a seismicseismic actionaction
��ApplicationsApplications ofof thesethese
DRW n°022575
A8
A6
DRW n°022575
A7 DRW n°022575
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>> NEFOREEE2 NEFOREEE2
��TITLE:TITLE: Controlled Testing in the Non-Linear Range
ooRESULTS: Modal RESULTS: Modal AnalysisAnalysis
�� 1.5% 1.5% withoutwithout dissipationdissipation
devicesdevices
�� 3.0% 3.0% withwith DorkaDorka DissipationDissipation
devicesdevices
�� 7.5% 7.5% withwith JarrettJarrett DissipationDissipation
devicesdevices
LNEC EXPERIENCE IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
��Modal Modal frequenciesfrequencies
obtainedobtained usingusing FRF FRF
andand PeakPeak PickingPicking
��OneOne singlesingle modemode
��DampingDamping estimatedestimated
for for allall modelsmodels::
0
2
4
6
8
10
12
cat00 cat01 cat02 cat03 cat04 cat05 cat06 cat07 cat08 cat09
cat10Test
Freq [Hz]
Evolution of the experimental frequencies
-
>> NEFOREEE2 NEFOREEE2
��TITLE:TITLE: Controlled Testing in the Non-Linear Range
ooRESULTS: RESULTS: DorkaDorka DissipationDissipation
DevicesDevices
LNEC EXPERIENCE IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
ElCentro 0.2g EC8 0.2g EC8 0.6g EC8 0.8g EC8 1g NW top accel
trans [g] 0.26 0.32 1.02 1.16 1.39 SW top accel trans [g] 0.27 0.37
1.11 1.25 1.51 Vert mass accel (CM) [g] 0.014 0.020 0.47 1.18 1.26
NW top column displ [mm] 63.34 26.23 78.92 104.40 110.20 SW top
column displ [mm] 63.45 26.49 80.57 106.69 133.85 FNorth [kN] 10.49
14.47 42.87 49.43 56.98 FSouth [kN] 12.59 17.47 47.41 58.22 60.12
Displ North [mm] 0.27 0.40 1.03 1.75 4.02 Displ South [mm] 0.38
0.36 1.26 2.51 5.49
•0.6g
•1.0g
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>> NEFOREEE2 NEFOREEE2
��TITLE:TITLE: Controlled Testing in the Non-Linear Range
ooRESULTS: RESULTS: JarrettJarrett DissipationDissipation
DevicesDevices
LNEC EXPERIENCE IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
•0.6g
•1.0g
ElCentro 0.2g EC8 0.2g EC8 0.6g EC8 0.8g EC8 1g NW top accel
trans [g] 0.37 0.27 0.89 1.50 1.70 SW top accel trans [g] 0.33 0.30
0.87 1.58 1.74 Vert mass accel (CM) [g] 0.007 0.009 0.05 0.09 0.13
NW top column displ [mm] 63.04 28.27 85.57 107.12 102.23 SW top
column displ [mm] 63.35 28.65 86.30 114.06 133.63 FNorth [kN] 6.30
8.21 20.89 35.63 50.54 FSouth [kN] 6.76 8.63 21.63 39.48 54.81
Displ North [mm] 1.96 1.99 10.61 11.71 12.55 Displ South [mm] 1.95
1.89 10.33 12.00 12.48
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111 INTRODUCTIONINTRODUCTIONINTRODUCTION
222 ANTIANTIANTI---SEISMIC SYSTEMS: General SEISMIC SYSTEMS:
General SEISMIC SYSTEMS: General AspectsAspectsAspects
333 LNEC EXPERIENCE IN ANTILNEC EXPERIENCE IN ANTILNEC
EXPERIENCE IN ANTI---SEISMIC SEISMIC SEISMIC
SYSTEMSSYSTEMSSYSTEMS
44 LNEC FUTURE DEVELOPMENTS IN ANTILNEC FUTURE DEVELOPMENTS IN
ANTI--
SEISMIC SYSTEMSSEISMIC SYSTEMS
555 CONCLUSIONSCONCLUSIONSCONCLUSIONS
CONTENTS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
-
> Tuned Liquid Dampers (TLDs) have been receiving particular
attention from the international scientific comunity since the90s
as a simple but effective way of reducing the buildingsresponse
when subjected to dinamic actions
> A considerable number of these devices has been instaled
inareas with higher seismic risk and low frequency
constructions(towers, bridges …)
> Increasing interest in the use of these devices for
currentbuildings
> Portuguese constructions are increasing in height
andbecoming more flexible (with the reducion of the fundamental
frequency)
LNEC FUTURE DEVELOPMENTS IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
-
> Study of less expensive and easy to mantain solutions
(goodrelation cost-benefit)
> Increasing in the area of research activities
(mainlyexperimental) in order to better understand the
maincharacteristcs and benefits of new energy dissipation
devicessolutions
LNEC FUTURE DEVELOPMENTS IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
Study on the effectiveness of Tuned Liquid Dampers(TLDs) for
reducing dynamic vibrations in buildings
- LNEC Research Project and PhD thesis -
-
LNEC FUTURE DEVELOPMENTS IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
> Study on the effectiveness of Tuned Liquid Dampers (TLDs)
for reducing dynamic vibrations in buildings
�Historical evolution and state of the art in the area ofseismic
protection devices
�General characterization of the existing Seismic Protection
Devices (with particular interest in the Energy Dissipation
Devices) and basic principles of functioning
�Practical applications of Energy Dissipation Devices inexisting
structures
-
LNEC FUTURE DEVELOPMENTS IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
> Study on the effectiveness of Tuned Liquid Dampers (TLDs)
for reducing dynamic vibrations in buildings
�Analytical simulations (preview and validate theexperimental
results)
o Use of the free acess software CLAWPACK (Conservation
LAWsPACKage) developed by the Washington University
o Solving of 1D, 2D and 3D linear and non-linear problems
-
LNEC FUTURE DEVELOPMENTS IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
> Study on the effectiveness of Tuned Liquid Dampers (TLDs)
for reducing dynamic vibrations in buildings
�Experimental program
o General characterization of the Tuned Liquid Dampers to
beexperimentally tested
o Testing set-up
� TLD – 1GDL
� SDOF structure + TLD – 2 GDL
o Parametric study (water height, excitation, TLD shape, liquid,
presenceof suspension particles, mass ratio, …)
o Results analysis
-
LNEC FUTURE DEVELOPMENTS IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
> Study on the effectiveness of Tuned Liquid Dampers (TLDs)
for reducing dynamic vibrations in buildings
�Experimental program
-
LNEC FUTURE DEVELOPMENTS IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
> Study on the effectiveness of Tuned Liquid Dampers (TLDs)
for reducing dynamic vibrations in buildings
�Experimental program
-
LNEC FUTURE DEVELOPMENTS IN ANTI-SEISMIC SYSTEMS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
> Study on the effectiveness of Tuned Liquid Dampers (TLDs)
for reducing dynamic vibrations in buildings
�Comparison between the results obtained for the
differentexperimental programs previously developed in LNEC andthe
results obtained for TLDs
o Metallic Dampers (ECOEST2)
o Shape Memory Alloys (ECOEST2)
o Viscoelastic Dampers (NEFOREEE)
o Viscous Fluid Dampers (NEFOREEE)
�Definition of recomendations related with the use of
EnergyDissipation Devices in new or existing structures
-
111 INTRODUCTIONINTRODUCTIONINTRODUCTION
222 ANTIANTIANTI---SEISMIC SYSTEMS: General SEISMIC SYSTEMS:
General SEISMIC SYSTEMS: General AspectsAspectsAspects
333 LNEC EXPERIENCE IN ANTILNEC EXPERIENCE IN ANTILNEC
EXPERIENCE IN ANTI---SEISMIC SEISMIC SEISMIC
SYSTEMSSYSTEMSSYSTEMS
444 LNEC FUTURE DEVELOPMENTS IN ANTILNEC FUTURE DEVELOPMENTS IN
ANTILNEC FUTURE DEVELOPMENTS IN ANTI---
SEISMIC SYSTEMSSEISMIC SYSTEMSSEISMIC SYSTEMS
55 CONCLUSIONSCONCLUSIONS
CONTENTS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments
-
> The implementation of seismic protection devices to
Portugal (as a country of moderated seismic risk) ischallenging
because it allows the reduction of the direct andindirect
consequences related with the seismic actions
> In many cases (TLDs) it may be achieved a profitable
cost-benefit relation
> Despite the progresses in the research is important
theawareness of all the entities involved in the
process(government, construction companies and final users)
> The generalization in the use of innovative
seismicprotection devices will allow the reduction of the
seismicrisk related with the existing constructions
CONCLUSIONS
INNOVATIVE ANTI-SEISMIC SYSTEMS: LNEC experimental research and
future developments