Meena Rezkallah, P.Eng.
Updated: Dec 20, 2020
A sway brace (shown in Figure 3-102) is a specific type of engineered hardware, which appears to be a variable spring attached to a sway strut. It is usually used to tune the natural frequency of a system away from a resonance, by altering the stiffness term in the equation of dynamic motion. The sway brace is modeled as a restraint in a single degree of freedom, with a stiffness equal to the spring rate of the sway brace's variable spring. Since the sway brace is normally attached with a clamp, no friction would be modeled.
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