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Edgar de los Santos
By
August 16, 2021

Midas Civil: Cable Stayed Bridge - Octávio Frias de Oliveira Bridge

The Octávio Frias de Oliveira Bridge is a structure made up of cable-stayed bridges supported by a single tower that connects Marginal Pinheiros with Avenida Jornalista Roberto Marinho in the city of São Paulo.

 

Table of Contents:

Main Features

History and Project Description

Important Aspects 

Project Application in midas Civil

 


 

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:

-Construction stage analysis

-Moving load analysis

-Post-tensioned analysis

-Staged tensioning

 

Program used: midas Civil, MIDAS 'integrated solution for bridges. Learn more

Height: 138.0 m (452.75 ft)

Year of inauguration: 2008

 

History Project Description

 

The Octávio Frias de Oliveira Bridge is a structure made up 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 essential changes in terms of its structural system and architecture.

 

A 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 two symmetrical 143 m (469 ft) spans each. In this design, each board rested on its tower.

 

Figure 1. Preliminary design

 

Each curved deck needs one inclined mast to be balanced.

Figure 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.

 

Figure 3. X-shaped tower proposed

 

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

  • Electricity transmission lines
  • Water conduction canals
  • River Pinheiros
  • Railway lines
  • Marginal Pinherios Avenue

 

Figure 4. Foundation's local interference

 

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

 

Figure 5. Excavated piles & root piles

 

 

Untitled Project

 

Video 1. Preliminary design & final design

 

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

Figure 6.Vitruvian Man & "Vitruvian" tower comparison

 

Important Aspects

 

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

 

Figure 7. Octávio Frias de Oliveira Bridge under construction

 

 

 

The bridge has an elevated height of 138 m (452.75 ft) compared with other cable-stayed bridges with the same span; however, the engineers must assure vertical clearance of 6 m (19.7 ft) between the carriageway and the cables.

Figure 8. Octávio Frias de Oliveira Bridge Tower

 

The cables have a unique spatial arrangement due to the deck's curvature and tower inclinations. The structure has 18 pairs of cable stays in each of the four spans for 144 cables. Furthermore, steel consumption is 374,350 m (1,228,182 ft) of strand and 462 tons of steel.

 

 

Project Application in midas Civil

 

Figure 10. Midas Civil render (Isometric view)

 

 

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

 

Figure 12. U.L.S. Mz envelope for the deck elements 

 

Figure 13. U.L.S. Fxmín. envelope for the tower elements (right)

 

 

 

 

complex bridge-blog

 





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