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Community/Recreation Centers : North Tahoe Transit Center   1  This unique Transit Center structure faced many difficult engineering challenges. Located in a high seismic zone and with heavy snow loads, a structure was needed that provided for a ‘floating roof’ while providing enough capacity to resist the loads imposed by snow and earthquakes. A box steel beam spine was chosen as the ‘backbone’ of the structure, with pre-engineered steel trusses (to help facilitate a limited construction season) to create the roof shape. Vertical and lateral support was provided by utilizing steel tube shapes in conjunction with concrete walls. The foundations were kept shallow to keep them out of the high groundwater table Copyright © The Crosby Group. All Rights Reserved.