Strength of Steel Frames under Gravity Loads

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Abstract
The stability of tall, rigidly-jointed, unbraced, steel frames under pure gravity loads is ensured when proportioned by the current allowable-stress concept provided they meet certain specified constraints. These requirements, in fact, govern the individual story stiffnesses and the maximum axial stresses in the columns. A study on seven building frames confirms that for a class of inherently stiff frames, all instability effects may be ignored in design without affecting structural safety under gravity loads.

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