![]() ![]() Arbitrarily changing the diaphragm stiffness without understanding the ramifications on the stiffness solution can produce solution results that are inaccurate. "You may alter the stiffness of the diaphragm, though this value should almost never be changed. ![]() ![]() Other conditions can be evaluated and considered flexible were the computed in-plan diaphragm deflection is more than twice the average story drift of the adjoining vertical elements. Regarding modeling sloped diaphragms: I have added weightless "diagonals" of certain stiffness between framing members to model the impact of diaphragms in the past.ĪSCE 7 says untopped steel deck and wood sheathing can be idealized as a flexible diaphragm, while concrete slabs and concrete on metal deck with a span to depth ratio of 3 or less without horizontal irregularities can be idealized as rigid.
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