![]() ![]() ![]() Guidance on the determination of equivalent horizontal forces and on the consideration of second order effects in discussed in the sections below, and a Frame stability design tool is also available.įorces in the individual members of the bracing system must be determined for the appropriate combinations of actions. Second order effects due to sway (if the frame is sensitive to second order effects).Equivalent horizontal forces, representing the effect of initial imperfections.The vertical bracing must be designed to resist the forces due to the following: Note that when crossed diagonals are used and it is assumed that only the tensile diagonals provide resistance, the floor beams participate as part of the bracing system (in effect a vertical Pratt truss is created, with diagonals in tension and posts - the floor beams - in compression). ![]()
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January 2023
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