Gerber Roof Girders – DM3

Module 3 – Gerber Roof Girders

Design Module 3 covers the design of roof girders in Gerber construction. Design tables are provided to assist designers in selecting the cantilever girder and drop-in segment sizes for typical building applications with evenly spaced columns and joists.  The tables are applicable to flat roofs subject to dead, live, snow and vertical wind loads. Various girder and joist span combinations, lateral bracing configurations and load conditions are included. Solved examples are presented to illustrate practical applications.

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Description

Design Module 3 (DM3) covers the design of roof girders in cantilever-suspended-span construction, the dominant form of Gerber girder application. The selection of cantilever girders and drop-in segments is facilitated by a large number of design tables based on typical building applications with evenly spaced columns and joists.

The tables are applicable to flat roofs subject to a wide range of dead, live, snow and vertical wind loads representing many Canadian locations. Various girder and joist span combinations, lateral bracing configurations and load conditions are included. Solved examples are presented to illustrate practical applications. Other aspects of Gerber design, such as joists, columns, base plates, and connections, are not covered.

DM3 is intended to be used in conjunction with the National Building Code of Canada (2015) and CSA Standard S16-14, Design of Steel Structures. It applies to wide-flange (W-shape) beams produced to ASTM A992/A992M and A572/A572M Grade 50[345].

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