SEISMIC ENGINEERING RESEARCH INFRASTRUCTURES FOR EUROPEAN ... · PDF fileseismic engineering research infrastructures for european synergies ... seismic engineering research infrastructures

S E R I E SSEISMIC ENGINEERING RESEARCH INFRASTRUCTURES FOR EUROPEAN SYNERGIES

COMMISSION OF THE EUROPEAN COMMUNITIESFP7- INFRASTRUCTURES-2008-1SP4-Capacities

SERIES LNEC Training Course, Lisbon, 23 September 2 012

Preparatory Course On Dynamic

Experimental Testing

Alfredo Campos CostaLNEC

SEISMIC ENGINEERING RESEARCH INFRASTRUCTURES FOR EUROPEAN SYNERGIES


Course outline

1. LNEC Earthquake Engineering and Structural Dynamics

Division (Alfredo Campos Costa)

2. Physical Modeling Instrumentation and Testing (Paulo

Candeias)

3. Practical Introduction to Measurements, Signal Processing

and System Identification for Dynamic Testing (Luís

Mendes)

4. Hands-on application (all)



Lectures training course (1st day)



LNEC Earthquake Engineering and

Structural Dynamics Division

1. LNEC ST facility, past and present

2. Hands on application

The 15WCEE Blind Test Challenge initiative

S E R I E SSEISMIC ENGINEERING RESEARCH INFRASTRUCTURES FOR EUROPEAN SYNERGIES

COMMISSION OF THE EUROPEAN COMMUNITIESFP7- INFRASTRUCTURES-2008-1SP4-Capacities


LNEC ST facility, past and present

1. LNEC seismic testing facility

• Main characteristics:

� Area ≈≈≈≈ 450m2

� Ceiling height 10m

� Movable height 6m

� Travelling crane 400kN

� Access gates 4.5m

http://www.lnec.pt/organizacao/de/nesde/



LNEC ST facility, past and presentLNEC seismic testing facility

LNEC seismic testing facility

� Large 3D shake table

� 3 Reaction walls

� Small 1D shake table




LNEC ST facility, past and presentLNEC seismic testing facility� Max payload 40 ton

� Platform 4.6m by 5.6m

� Three independent orthogonal axes

� Displacements actively controlled

� Rotations passively restrained

� Frequency range from 0.1Hz up to 40Hz


3D shake table





5.93m

6,83m6,83m


3 Reaction Walls

� Two 7m height x 4m width transverse walls (E-W)

� One 7m height x 4m width longitudinal wall (S)

� Connected in the base to a stiff prestressed beam foundation ring





1D shake table

� Max payload 6 tonnes

� Platform 3.2m by 2.2m

� Single horizontal/vertical axis

� Displacement actively controlled

� Frequency range from 0.1Hz up to 25Hz






Experimental activity – EU projects

• ECOEST II – 1996-1999 (5 User Groups)

• NEFOREEE – 2001-2005

• ECOLEADER – 2002-2005 (4 User Groups)

• SPEAR – 2002-2005

• PRECAST EC8 – 2003-2006

• SAFECAST – 2009-2012

• SERIES – 2009-2013 (4 User Groups)



2. Hands-on application 15WCEE Blind Test Challenge



2. Hands-on application

SummaryThe 15WCEE Blind Test Challenge is a blind prediction competition in which competing teams are invited to predict the nonlinear seismic behaviour of two reinforced concrete structures

• Geometrically identical, designed for low and high ductility levels according to the EC8 provisions.

• Predictions provided by each team will be assessed based on the results obtained with full-scale structures that will be tested during the 15WCEE on the LNEC -ST.

• RMS error values between the experimentally achieved (on the physical models) and the numerically predicted relative displacements, for two

selected control points, will be used for classification purposes.




Description of the physical models• RC models A and B are 3D frame

structures with four columns, four beams and ½ slab.

• Nine additional masses ≈1 200 kg on top of the slab.

Materials• Concrete C25/30 (fck = 25 MPa; fctk, 0,05 1,8 MPa; fctk, 0,95 3,3 MPa)

• Steel S500 (fyk = 500 MPa)




Steel detailing -Model A1. High resistance - Low concrete cover (1cm)

2. Low ductility capacities - High constant spacing hoops (15 cm)




Steel detailing -Model B1. Low resistance - High concrete cover (2,5cm)

2. High ductility capacities – Low constant spacing hoops (5 cm)




Reference Seismic Action1. Two horizontal uncorrelated orthogonal motions

2. EC8 standard format for 5% damping elastic Response Spectra

( )

( )

( )

( )

⋅⋅=≤≤

⋅⋅=≤≤

⋅⋅=≤≤

⋅+⋅⋅=≤≤

2DC

gReD

CgReDC

gReCB

gReB

5,2 :s4

5,2 :

5,2 :

5,11 :0

T

TTSaTSTT

T

TSaTSTTT

SaTSTTT

T

TSaTSTT

B

sT

sT

sT

S

sma

2

6,0

1,0

3,1

5,1

D

C

B

2gR

===

=

=




Target Input MotionsPhase angles from time segments of two horizontal orthogonal components of a real strong motion signal registered during the earthquake of Great East Japan (Tohoku) (2011-03-11)

� non-stationaries input motions




Target Input MotionsPhase angles from time segments of two horizontal orthogonal components of a real strong motion signal registered during the earthquake of Great East Japan (Tohoku) (2011-03-11)

� non-stationaries input motions




Drive motions for 4 intensity levels• Calibration specimen built to obtain

shaking table drive motions.

• 4 intensity levels of drive motions (LOW - 20% of the reference level; MED - 70%

of the reference level; REF - 100% of the reference level and HIGH - 200% of the reference level)




Rules of the challenge• Teams will be classified based on the RMS error

between numerical relative displacements in points A and B inthe transverse (x) and longitudinal (y) directions of the structure as compared to the measured relative displacements in the two structures.

( ) ( )

( ) ( )∑∑

∑∑

==

==

−×+−×+

+−×+−×=

N

iii

N

iii

N

iii

N

iiiRMS

TBcompTBN

LBcompLBN

TAcompTAN

LAcompLAN

error

1

2

1

2

1

2

1

2

exp__1

exp__1

exp__1

exp__1




Construction phase

Model B

Model A

SOUTH - SIKA Grouting

NORTH – Epoxide resin (HILTI)




Construction phase

Column base steel reinforcementBeam-column joint steel

reinforcement

Model B Model B

Model A&B

Model A Model B




Construction phase

1º Phase concrete pouring


Foundation and column

Top column, beams and slabs




Concrete and steel mechanical

properties

Steel rebar strength testConcrete compression and flexural test Concrete cone Slump test





properties





properties Resistência à compressão (NP EN 12390-3 de 2011)

Identificação do

provete* Classe*

Data Idade

(dias)

Dimensões

(mm)

Secção Massa Massa Rotura Obs.

Fabrico* Ensaio volúmica Força Tensão

(mm2) (g) (kg/m3) (kN) (MPa)

1 - 2012-08-02 2012-08-30 28 153X150X150 22950 7943 2310 847 36,9 -

2 - 2012-08-02 2012-08-30 28 152X150X150 22800 7833 2290 816 35,8 -

3 - 2012-08-02 2012-08-30 28 154X150X150 23100 7960 2300 790 34,2 -

* Dados fornecidos pelo cliente.

Resistência à flexão (NP EN 12390-5 de 2009)

Identificação Data Idade Vão Dimenssões Rotura Localização

do de mm Força Tensão da

provete * ensaio (dias) (mm) d1 d2 comprimento (kN) (MPa) Rotura**

1 2012-08-30 28 450 151 150 550 30,9 4,1 N

2 2012-08-30 28 450 151 150 550 32,1 4,3 N

3 2012-08-30 28 450 152 150 550 33,6 4,4 N

4 2012-08-30 28 450 150 150 550 29,2 3,8 N

* Dados fornecidos pelo cliente. **Localização da rotura: N (interior aos roletes superiores), E (exterior aos roletes superiores).






propertiesResistência à compressão (NP EN 12390 -3 de 2011)

Identificação do

provete* Classe*

Data Idade

(dias)

Dimensões

(mm)

Secção

(mm2)

Massa

(g)

Massa volúmica (kg/m3)

Rotura Obs.

Fabrico* Ensaio Força (kN)

Tensão (MPa)

1 - 2012-08-10 2012-09-07 28 150X150X150 22500 7878 2330 677 30,1 -

2 - 2012-08-10 2012-09-07 28 150X150X150 22500 7979 2360 675 30,0 -

3 - 2012-08-10 2012-09-07 28 150X150X150 22500 7906 2340 675 30,0 -

* Dados fornecidos pelo cliente.

Resistência à flexão (NP EN 12390-5 de 2009)

Identificação do

provete *

Data de

ensaio

Idade

(dias)

Vão

(mm)

Dimenssões (mm) Rotura Localização

da Rotura**

Força (kN)

Tensão (MPa) d1 d2 comprimento

1 2012-09-07 28 450 151 150 550 25,5 3,4 N

2 2012-09-07 28 450 152 150 550 25,3 3,3 N

3 2012-09-07 28 450 151 150 550 26,0 3,4 N

4 2012-09-07 28 450 152 150 550 30,7 4,1 N

* Dados fornecidos pelo cliente. ** Localização da rotura: N (interior aos roletes superiores), E (exterior aos roletes superiores).





Construction phase

Model B

Model A



Hands-on application (2nd day)



2. Hands-on application (2nd day)






• Control of the shaking table


Thank you

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SEISMIC ENGINEERING RESEARCH INFRASTRUCTURES FOR EUROPEAN ... · PDF fileseismic engineering research infrastructures for european synergies ... seismic engineering research infrastructures