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Washington Mutual Tower, office building

location: Seattle, Washington, USA
The 42-story Washington Mutual Tower (WAMU) and the 16-story Seattle ART Museum (SAM) form a special building complex. The lateral force resisting system of the tower consists of a concrete core which is complemented by an outrigger system up to about one-third of the building. The outrigger system includes the diagonal BRB elements as well. The other innovation of the project, the Performance-Based Design resulted significant cost savings: 30 to 50 USD/m2 was saved in the building construction. In addition, the structure’s seismic reliability has been improved, its performance became more predictable and the construction time was also reduced by two months.
   
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