Chacao Bridge (Wind Resistant Design)
The Chacao Channel bridge would link the island of Chiloé with mainland Chile crossing the Chacao Channel. Once completed, it will be the longest bridge in South America.
Chacao Bridge consists of two adjacent cable-suspended main spans. The length of the Chacao Bridge would be 2,750m in total length consisting of three concrete towers, which are 157m and 199m height for the towers at both ends and is 175m height for tower in the middle, two main spans of 1,055m and 1,155m each and suspended side spans of 216m and 324m with steel box decks accommodating 4 lanes of a carriageway.
The wind tunnel tests and analyses were carried out to investigate the wind-induced behaviors of the bridge during and after construction. The items of tests and analyses are described as follows:
Wind Tunnel Test/Analysis Conducted:
▣ Topographic model test
▣ Section model test of bridge deck
▣ Section model test of pylon leg
▣ Aeroelastic model test of free standing pylon
▣ Aeroelastic model test of full bridge
▣ Wind shield model test
▣ Wind-resistant design of hanger cable