Cable-Stayed Bridge in São Paulo Brazil

March 30, 2021
BLOG CASE STUDY

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Table of Contents:

 

1. Main Features

2. History and Project Description

3. Important Aspects 

4. Project Application in midas Civil

 


 

1. Main Features

 

Project name: Octávio Frias de Oliveira Bridge

Location: São Paulo, Brazil

Company: Enescil Engenharia e Projetos Ltda

Engineer: Eng. Catão F. Ribeiro; Eng. Heitor Afonso Nogueira Neto

 

Types of analysis used:

- Analysis of construction stages

- Moving load analysis

- Post-tension analysis

- Tensioning by stages

 

Program used: midas Civil

Height: 138.0 m

Year of inauguration: 2008

 


2. History and Project Description

The Octávio Frias de Oliveira Bridge is a structure made up of a system of cable-stayed bridges supported by a single tower that connects Marginal Pinheiros with Avenida Jornalista Roberto Marinho in the city of São Paulo. It is very particular because during its conception, it underwent important changes in terms of its structural system and architecture.

Next, we tell you a little more about this flagship project of the city:

Considering, on the one hand, the importance of bridges in the development of a country, and on the other, how iconic they can become, within the preliminary designs it was considered to build two independent cable-stayed bridges with 2 symmetrical 143m spans. each. In this design, each board rested on its own tower.

Preliminary designFigure 1. Preliminary design

Each curved deck needs one inclined mast to be balanced

Deck Plan View & Mast Elevation ViewFigure 2. Deck Plan View & Mast Elevation View

Due to this structural necessity, an X-shaped tower was proposed where the overlapping of the decks happens just right below the tower; the inclined masts intersect, bracing each other.

X-shaped tower proposed

Figure 3. X-shaped tower proposed
 

For the design of the foundations, local interference were considered such as:

  • Electricity transmission lines

  • Water conduction canals

  • River Pinheiros

  • Railway lines

  • Marginal Pinherios Avenue

Foundations local interferences
 
Figure 4. Foundations local interferences
 
 

Each pile cap has 28 excavated piles with Ø130cm and 10 root piles with Ø 41cm.

 

Excavated piles & Root piles
 
Figure 5. Excavated piles & Root piles
 
 
 
Timeline History
 
 

This structure was developed mathematically from the Fibonacci sequence, and designed using DaVinci's Vitruvian Man as a source of inspiration.

Vitruvian Man & "Vitruvian" tower comparisonFigure 6. Vitruvian Man & "Vitruvian" tower comparison


3. Important Aspects

 

Both cable-stayed decks are supported by one single tower. Inclination is necessary to minimize the torsional effects due to permanent loads and assure the 6 m vertical clearance between the cables and carriageway. 

vista-aerea-del-puente-vacio___nPOdZHGs22_0x750__3Figure 7. Top view of the Octávio Frias de Oliveira Bridge

 

The bridge has an elevated height (138 m) when compared with other cable-stayed bridges with the same span; however, vertical clearance of 6 m between the carriageway and the cables must be assured. 

 

Towers of the Octávio Frias de Oliveira BridgeFigure 8. Towers of the Octávio Frias de Oliveira Bridge

 

Unique spatial arrangement due to the decks curvature and tower inclinations. The structure has 18 pairs of cable stays in each of the 4 lights, for a total of 144 cables. Furthermore, steel consumption is 374,350 m of strand and 462 tons of steel. 

 

Puente octávio frias de oliveira Vista superior

Figure 9.  Octávio Frias de Oliveira Bridge

 

 


4. Project Application in midas Civil

 

Midas Civil render (Isometric view)Figure 10. Midas Civil render (Isometric view)

 

.L.S. Mz enveloped for the tower elements (Isometric view)Figure 11. U.L.S. Mz enveloped for the tower elements (Isometric view)

 

U.L.S. Mz envelope for the deck elements (left); U.L.S. Fxmín. envelope for the tower elements (right)Figure 12. U.L.S. Mz envelope for the deck elements (left); U.L.S. Fxmín. envelope for the tower elements (right)

 

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About the Author
Edgar De Los Santos | Senior Engineer | MIDASoft Inc.

Edgar is a Senior Engineer at MIDASoft Inc. experienced in numerical modeling and bridge design, and has over 8+ years of experience. Edgar has participated in designs of prestressed girder bridges and segmental bridges. 

Edgar pursued his Civil engineering degree from the New Jersey Institute of Technology (NJIT) and is currently pursuing a master's degree in Civil engineering at the Universidad del Norte in Barranquilla, Colombia. 

 

 

 

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