Post on 26-Jan-2021
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
> 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
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)
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
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
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
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
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
>> 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
>> 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
>> 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
>> 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
>> 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
>> 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
>> 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
>> 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
>> 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
>> 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
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