Monitoração de Estruturas e Ensaios Dinâmicos · B 7 B 8 layout the bridge J K Brasilia Bridge...

Monitoração de Estruturas e Ensaios Dinâmicos

Stressing with Real Time Load to Installation the Stay Cable in the

Brasilia Bridge

Pedro Afonso de Oliveira AlmeidaFernando Rebouças Stucchi

Professor of Department of Structure and Geotechnical Engineering, EscolaPolitecnica, Sao Paulo University - USP, Brazil

Alex Barros de SáMinoru Onishi

Protende – Tensacciai Director, Protende – Tensacciai, Brazil

J K Brasilia bridge, panoramic view Sumary

• Geometrical characteristic• The stressing the stay cable during the

installation and instrumentation plan• Results and analysis• Conclusions

The Brazilian Bridge – J K

720 m

r = 3,150 m

1200 m

240 m

B 5

B 6

B 7B 8

layout the bridge J K Brasilia Bridge schematic view of the arch


Cross section of the metallic deck, between the hanger Cross section of the metallic deck on the hanger anchorage concrete pillars for support of the steel deck – block B7

Block B7 – 1.5 m below the surface of the lake

inclined pillars 45 degree

Clubes arch support – Block 8

surface of the block B8 – 1.5 m below the surface of the lake

hollow box made of concrete for support of the metallic arch

tag for survey

hollow box made of concrete for support the steel arch Metallic structures over the deck for the construction of the arches

temporary steel tower for support the deck and the arch


Release the temporary metallic support after the arch closed

62 m

panoramic view of the arches construction Sumary



Layout the instrumentation plan of three arches of the Brasilia BridgeLayout of the instrumentation plan the Brasilia Bridge

main span - central arch panoramic view of the arch before the installation hanger


load cells for strand – setup phase Phase a – 4 hangers in the central arch Load cell on the anchorage

Phase b – more 4 hangers


Sumary



Stay tensile during 24 hours SHIS – phase a – 1a

CLUBES – phase a

FORÇAS NOS ESTAIS - ARCO CLUBES - fase a

0

100

200

300

400

500

600

700

800

900

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

ESTAI

FOR

ÇA

, em

kN

F Estai kN

F (EGT) kN

SHIS – phase b: 5-12 CLUBES – phase b

FORÇAS NOS ESTAIS - ARCO CLUBES - fase b

0

100

200

300

400

500

600

700

800

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

ESTAIS

FOR

ÇA

, em

kN

F Estai kN

F (EGT) kN


SHIS – phase c : 1-8; 9-16 SHIS – phase d : 6-11 SHIS – phase e : 2-4; 13-15

central arch

FORÇAS NOS ESTAIS - ARCO CENTRAL - 20 kN - 1a. ETAPA

0

200

400

600

800

1000

1200

1400

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

ESTAI

FOR

ÇA

, em

kN

Força (kN) Força EGT (kN)

ARCO SHIS

FORÇAS NOS ESTAIS - ARCO SHIS - 20 kN - 1a. ETAPA

0

200

400

600

800

1000

1200

1400

1600

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

ESTAI

FOR

ÇA

, em

kN


clubes arch – 20%

Arco Clubes - etapa 20% tensionamento

0

200

400

600

800

1000

1200

1400

1600

1800

2000

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

estai

Forç

a (k

N)

valores medidos valores PTEGTvalores PROJCONSULT


shis arch

FORÇAS NOS ESTAIS - ARCO SHIS - 80% - 3a. ETAPA

0

500

1000

1500

2000

2500

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

ESTAI

FOR

ÇA

, em

kN


clubes arch – 80%


0

500

1000

1500

2000

2500

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

estai

Forç

a (k

N)


clubes arch – Nd 100%


0

500

1000

1500

2000

2500

3000

3500

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

estai

Forç

a (k

N)


strain gages instrumentation on the arch strain gages instrumentation details of the straing gages instrumentations


strains of the metallic arch - construtictions phases

Deformações - ARCO CENTRAL (7A)

-750,0

-550,0

-350,0

-150,0

50,0

250,0

450,0

13/06/02 03/07/02 23/07/02 12/08/02 01/09/02 21/09/02 11/10/02 31/10/02

Data

defo

rmaç

ão e

spec

ífica

(um

/m

E1E2E3E4E5E6E7

Survey – target Numerical model – JK Bridge

Numerical model – JK Bridge Brasilia Bridge – physical model Panoramic view of the model


static testing on model Máquina para ensaio de fadiga FTT 30MN

survey station anemomometer Ensaios dinâmicos


results of the dynamics testing Reanálises – ensaios quase-estáticos

E13CE

136

137

138

139

140

141

142

143

144

145

0 200 400 600 800 1000 1200 1400 1600 1800 2000

tempo ( s )

F ( t

f )

results of the static testing

E15CE ida pelo lado Alvorada

-1

0

1

2

3

4

5

6

300 320 340 360 380 400 420 440

dist ( m )

forç

a ( t

f )

numerical model Sumary



Conclusions

• The JK Brasilia Bridge exhibits light aesthetic qualities and represents an important architectural advanced in bridge construction, included new technological advanced in installation stayed cable;

• In the installation on the Brasilia Bridge to be used the length method together the force method, monitoring the load on real time. In this case, to be used 60 load cells into stay cable between the arc-deck and the bearing system, all connected to the data logger system. With this instrumentation all the effects induced by environment actions and the setup operation (stressing operation) were measured and considered on the final assessment of the bridge, with equalized all the elements within a range of 2.5 %, as like PTI Recommendation;

• Concomitant to the load measurement were monitoring the strain, temperature and wind velocity. The strains were measured on 3 cross sections on the metallic arc and the values were used to compare and the setup of the stay cable;

• After end execution of the Brasilia Bridge, all the instrumentation like load cell, temperature, strain gage, anemometers will be completed with accelerometer to do the performance testing called the “Dynamic Signature”. The Dynamic Signature are use to evaluated the performance of the bridge and to maintenance works, today.


J K – Brasilia Bridge• Owner: Companhia Urbanizadora da Nova Capitaldo Brasil- NOVACAP• Designer: PROJECONSULT - USIMINAS• Contractor: Consórcio Via-Dragados• Contractor for Monitoring: Consórcio PROTENDE-EGT• Completion: december, 2002

• ACKNOWLEDGEMENTS• We would like to thank Mr. Elmar, NovaCap President and Dr. Jose F.

S. Rodrigues, LSE Manager, for their unlimited help in take measures during the constructions fazes.

The End New Pedestrian Bridge in Acre State - Brazil

Passarela Estaiada com 200 mRio Acre – Rio Branco, AC – em montagem

Passarela Estaiada com 200 mRio Acre – Rio Branco, AC – fase final Monitoração na fase de montagem


Forças nos estais Arranjo geral dos estais

Monitoração de Estruturas e Ensaios Dinâmicos · B 7 B 8 layout the bridge J K Brasilia Bridge...

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