The Second Orinoco Bridge, Venezuela

Photo: COWI
Second Orinoco Bridge under construction.
COWI conducted an independent design review of the Second Orinoco Bridge in Venezuela.

The bridge is a 3,120 metres long combined road and railway bridge comprising a central single-track railway and a two-lane roadway on either side giving a total width of the bridge deck of 24.7 metres.

There are two 300 metres long cable-stayed navigation spans separated by a central cable-stayed bridge section containing an
inclined anchor pier.

Vertical clearance

The vertical navigation clearance is 41 metres above the maximum water level of the river.

The approach spans on both sides of the cable-stayed part of the bridge have a constant span length of 60 metres.

Composite structure

The superstructure for the entire bridge is a composite structure with a central closed steel box 5.7 metres wide and 5.5 metres high.

On each side of this closed steel box the roadways are supported every 3 metres by inclined steel struts welded to the central closed box.

On top of the steel structure there is a concrete slab 250 mm thick forming the road surface and the support for the railway ballast.

Purpose of the review

The purpose of the independent design review was to check the structural adequacy of the cable-stayed bridge structure.

The review comprised an evaluation of the design basis and a check of the structural system and all main structural members with respect to function and safety of the detailed design.

Critical construction analysed

The dynamic response of the bridge was checked with DVMFLOW and the risk of stay-cable vibrations was evaluated.

Critical construction stages were analysed comprising the free standing pylon and the cantilevered bridge before closure at mid-span.

LAST UPDATED: 31.03.2017