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

Transcrição

1 Stressing with Real Time Load to Installation the Stay Cable in the Brasilia Bridge Pedro Afonso de Oliveira Almeida Fernando Rebouças Stucchi Professor of Department of Structure and Geotechnical Engineering, Escola Politecnica, Sao Paulo University - USP, Brazil Alex Barros de Sá Minoru 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 layout the bridge J K Brasilia Bridge schematic view of the arch 12 m 72 m B 6 B 5 r = 3,15 m B 7 24 m B 8

2 Block B7 1.5 m below the surface o the lake 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 inclined pillars 45 degree Clubes arch support Block 8 hollow box made of concrete for support the steel arch Metallic structures over the deck for the construction of the arches hollow box made of concrete for support of the metallic arch tag for survey surface of the block B8 1.5 m below the surface of the lake temporary steel tower for support the deck and the arch

3 Release the temporary metallic support after the arch closed panoramic view of the arches construction Sumary 62 m Geometrical characteristic The stressing the stay cable during the installation and instrumentation plan Results and analysis Conclusions Layout the instrumentation plan of three arches of the Brasilia Bridge Layout of the instrumentation plan the Brasilia Bridge main span - central arch panoramic view of the arch before the installation hanger

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

5 Sumary Stay tensile during 24 hours SHIS phase a 1a Geometrical characteristic The stressing the stay cable during the installation and instrumentation plan Results and analysis Conclusions CLUBES phase a SHIS phase b: 5-12 CLUBES phase b FORÇAS NOS ESTAIS - ARCO CLUBES - fase a FORÇAS NOS ESTAIS - ARCO CLUBES - fase b FORÇA, em kn 5 4 F Estai kn F (EGT) kn FORÇA, em kn 4 F Estai kn F (EGT) kn ESTAI ESTAIS

6 SHIS phase c : 1-8; 9-16 SHIS phase d : 6-11 SHIS phase e : 2-4; central arch FORÇAS NOS ESTAIS - ARCO CENTRAL - 2 kn - 1a. ETAPA ARCO SHIS FORÇAS NOS ESTAIS - ARCO SHIS - 2 kn - 1a. ETAPA clubes arch 2% Arco Clubes - etapa 2% tensionamento FORÇA, em kn 8 6 FORÇA, em kn Força (kn) valores medidos valores PTEGT valores PROJCONSULT ESTAI ESTAI Força (kn) Força EGT (kn) Força (kn) Força EGT (kn) estai

7 shis arch FORÇAS NOS ESTAIS - ARCO SHIS - 8% - 3a. ETAPA clubes arch 8% clubes arch N d 1% 25 Arco Clubes - etapa 8% tensionamento Arco Clubes - etapa 1% tensionamento FORÇA, em kn 15 1 Força (kn) 15 valores medidos valores PTEGT valores PROJCONSULT Força (kn) 2 15 valores medidos valores PTEGT valores PROJCONSULT ESTAI estai estai Força (kn) Força EGT (kn) strain gages instrumentation on the arch strain gages instrumentation details of the straing gages instrumentations

8 strains of the metallic arch - construtictions phases Survey target Numerical model JK Bridge Deformações - ARCO CENTRAL (7A) deformação específica (um/m 45, 25, 5, -15, -35, -55, -75, 13/6/2 3/7/2 23/7/2 12/8/2 1/9/2 21/9/2 11/1/2 31/1/2 Data E1 E2 E3 E4 E5 E6 E7 Numerical model JK Bridge Brasilia Bridge physical model Panoramic view of the model

9 static testing on model Máquina para ensaio de fadiga FTT 3MN survey station anemomometer Ensaios dinâmicos

10 results of the dynamics testing Reanálises ensaios quase-estáticos results of the static testing E13CE E15CE ida pelo lado Alvorada F ( tf ) tempo ( s ) força ( tf ) dist ( m ) numerical model Sumary Conclusions Geometrical characteristic The stressing the stay cable during the installation and instrumentation plan Results and analysis 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 6 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.

11 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, 22 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 2 m Rio Acre Rio Branco, AC em montagem Passarela Estaiada com 2 m Rio Acre Rio Branco, AC fase final Monitoração na fase de montagem

12 Forças nos estais Arranjo geral dos estais