A physical building model whose floors had yet to be glued down was the design genesis for the twisting floor plates of Patch22, a seven-story, mixed-use timber structure in Amsterdam by local firm Frantzen et al Architecten. The 58,000-square-foot, net-zero energy building was also developed by firm principal Tom Frantzen and his business partner, Claus Ossouren. Despite appearances, Patch22's primary structure comprises a skeleton of timber columns and beams that join at right angles. The "twist" from floor to floor is achieved by sequentially extending the building's transverse floor beams-measuring 1.5 feet wide, 2.6 feet deep, and approximately 30 feet long- connect to the top chord. Where they connect to the bottom chord, the steel plate is surface mounted to the lower chord, rather than embedded.
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