| The framework for multistory buildings may be constructed in a number of ways, three of which are shown here. Skeleton framing (3a) involves a network of columns, girders, and beams, interconnected to provide strength and stability. In the cable hung method (3b), all floors except for the ground floor are supported by a central utility core. Each floor is both connected to the core locally and attached to the roof framing at the top of the core by hanging cables. The stacking frame (3c) utilizes boxlike prefabricated units, constructed off-site. Cranes lift the individual units into place, after which they are fastened together to create a sturdy framework. |
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