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Hercilio Luz Bridge

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Hercilio Luz Bridge

Hercilio Luz Bridge
Hercílio Luz Bridge
Carries closed since 1991
Locale Florianópolis, Santa Catarina state,  Brazil
Design suspension truss
Total length 819.5 m (2,689 ft)
Height 74 m (243 ft)
Longest span 340 m (1,115 ft)
Vertical clearance 43 m (141 ft)
Construction begin November 14, 1922
Opened May 13, 1926
Closed May 13, 1991
Coordinates

Located in Florianopolis, the capital city of Santa Catarina State in southern Brazil, the Hercilio Luz Bridge is the first bridge constructed to link the Island of Santa Catarina to the mainland.

It is the longest suspension bridge in Brazil. The central span was considered quite long (but not the longest, at 340 metres) at the time of its opening and is still one of the 100 largest suspension bridges.

Construction commenced on 14 November 1922 with the bridge being inaugurated on May 13, 1926. The total length is 819.471 metres, with 259 metres of viaduct from the island, a central span of 339.471 metres and 221 metres of viaduct from the mainland.

The steel structure weighs approximately weight five thousand tons, and the foundations and pillars consumed 14.250m³ of concrete. The two towers rise 74 metres from sea level, and the central span is 43 metres tall.

It has been closed to the public since May 13, 1991.

Contents

  • Historical background 1
  • Construction 2
  • Financing 3
  • Closure 4
  • External links 5

Historical background

The bridge was commissioned by Hercílio Luz, then governor of the state of Santa Catarina, to be the first permanent link between the island and the mainland. In addition to benefiting the then 40,000 residents of Florianópolis that were dependent on ferries to cross between the island and the mainland, Luz wanted to build the bridge to strengthen the position of Florianópolis as the state capital. At the time, other cities in the state considered the island to be too remote to be the administrative and political centre and consequently there was a movement to transfer the capital to Lages.

Construction

Aerial view of Hercilio Luz Bridge

The bridge was designed by the firm of Robinson & Steinman, and was built by the American Bridge Company (ABC). All the material it used was brought from the United States.

It has the fairly unusual feature that the truss carrying the roadway (a continuous stiffening component) is above the roadway itself and meets up with the cables making it non uniform in height. A similar bridge, the Walter Taylor Bridge, was built over the Brisbane River in Brisbane, Australia in 1936.

When completed the bridge was the longest eyebar suspension span in existence at that time. The 1,113’ long design features towers with rocker bearings. ABC brought to the project its own experimental heat-treated eyebars, and as project contractor pioneered stiffening techniques that saved materials and money while providing greater rigidity. Another bridge of similar design, the Silver Bridge over the Ohio River in the USA, collapsed in 1967 due to a failure in one of the eyebars.

Luz didn't get to see his bridge completed, dying in 1924 twelve days after having inaugurated a wooden replica built in XV Square specifically for the symbolic act. Originally intended to be named the Independence Bridge this was changed after Luz's death in a posthumous tribute. The bridge was inaugurated on May 13, 1926.

Financing

From the beginning, the funding process was complicated. The first bank that had lent to the Catarina government failed. Thus, a new loan had to be obtained delaying the works. In addition, a manoeuvre of the U.S. bankers arranging the financing made the state of Santa Catarina liable for debts of the failed institution. In the end, the cost reached 14.478 trillion reis, ten times the original estimate and almost double the state budget at the time. The repayment of loans, made by U.S. banks, was completed in 1978, more than 50 years after the inauguration of the bridge.

Closure

Ponte Hercilio Luz - December 1996 - by Sérgio Schmiegelow

With two other bridges (Colombo Sales Bridge and Pedro Ivo Bridge) now linking the island to the mainland, the Hercílio Luz Bridge was closed in 1982 on safety concerns. It reopened again on March 15, 1988 to pedestrian traffic, bicycles, motorcycles and horse-drawn vehicles only. It closed completely on July 4, 1991, after a report analyzing the feasibility of reopening the bridge traffic was presented in February 1990. In 1997 the landmark bridge was declared a historical and artistic monument.

Restoration of the bridge is being investigated by a partnership involving the Federal Government, State Government and the Municipality of Florianópolis. Submission of restoration plans is due in mid-2013.

External links

  • Hercilio Luz Bridge at Structurae
  • Hercilio Luz bridge at historicbridges.org
  • HAER report on the Three Sisters (Pittsburgh) which mentions the ABC and the eyebar features (Page 29) Some article material adapted from this public domain document.
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