A multi-year research program was recently completed that studied rolling sheet vehicular access door behavior during an extreme wind event. The work resulted in a new design protocol for the metal building industry and door manufacturers. Existing door curtain and jamb design approaches are viable for rigid door jambs, e.g., the wind-bar attached directly to a masonry wall, however for flexible jambs, e.g., a cold-formed steel framing system, the windlock forces and the door deflections should be calculated considering jamb and framing stiffness. A beam strip model based on an Euler-Bernoulli elastica solution is implemented in a freely available computer program that assumes curtain one-way action to calculated these deflections and forces. The project culminated in an access door analysis-based design approach coupled with a wind analysis computer tool and spreadsheet tutorials that treat both door serviceability and jamb strength limit states.
A beam strip model based on an Euler-Bernoulli elastica solution is implemented in a freely available wind analysis computer program for metal building vehicular access doors to calculate door jamb forces and curtain deflections considering jamb and framing flexibility. The software is provided to support analysis-based vehicular access door design for metal buildings. Existing access door curtain and jamb design approaches are viable for rigid door jambs. However it was shown with experiments that wind-lock forces decrease and door out-of-plane deflection increases when the door jamb and framing are more flexible, for example, in the case of typical cold-formed steel framing details where a C-section jamb is discretely braced by wall girts.