Bamboo open web joists are disclosed herein. One aspect of the invention is directed toward an open web joist design comprising a plurality of structural components made from compressed bamboo segments. Some of the structural components are formed into arched shapes. The structural components are built into a built-up beam comprising end members and span members comprising a frame, with a plurality of arched components positioned within the frame. Several fastener plates comprising a sheet with integral spikes are pressed into the structural components to hold the members together. The arched members define an open space in the built-up joist, through which mechanical components, electrical components, ducting, and other materials can pass.
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