<p>The Chacao Bridge is an asymmetric two-main-span suspension bridge crossing the 2.5 kilometer wide Chacao Channel in Southern Chile.</p><p>The bridge has main spans of 1155 m and 1055 m and a total length of 2754 m. The three concrete pylons have different heights and the Central Pylon (inverted Y-shape) is tuned to balance uneven forces in the two main spans.</p><p>The bridge site has especially harsh environmental conditions with strong winds, strong currents, and most notably, high seismicity, adding challenges to the bridge design.</p><p>In the process of detail design, a comprehensive set of global analyses have been conducted. This paper identifies some of the different sets of analyses and special challenges faced in the analysis procedures.</p>
<p>The Sandfjord bridge is a concrete box girder bridge with a 290 meter main span. The erection is done by the free cantilever method, i.e. after erection of the piers the bridge girder is cast in 5 meter segments from the piers keeping the cantilevers in balance, after which the cantilever beams are connected at centre span and the landings. During the construction stage the bridge is very sensitive to the dynamic action of the wind. This paper deals with the analytical calculations, wind tunnel tests and field measurements carried out.</p>
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