The roof beams are supported by the exterior main columns and are placed as a rafter. A truss is not included since a roof beam can carry the roof loads and also for the reason of abiding by the design intent of having a "high ceiling" and unobstructed natural light from the glazed section of the roof. The foundation is composed of isolated footings and retaining walls for the basement part.
The longest span involved is 13 meters which is located at the faade of the building. Since the requirement is for the faade to be entirely composed of glass, two columns are supporting two roof beams propped against each other. The load transfer is synonymous to that of an arch frame. The two columns are supported by a main beam at ground level and beams that connect it to the next span. In the event that a huge lateral load or a very heavy roof load is applied way beyond the structure can support, these columns likely would be the first components to fail. No attachments are made to the existing museum and library, thus the new extension is structurally independent from them. Spans of 4.5 meters and 9 meters are designed for the beams wherein intermediate beams are provided for beams supporting a span of 9 meters. This would yield smaller members in the subsequent analysis and design. Tie beams are also found in the foundation and ground floor framing to support lateral movements. ...Show more