Abstract
The chapter presents a practical advanced analysis method for a steel frame design, based on a simplified second-order elastic analysis of the structure with an equivalent geometric imperfection. The second order effects are calculated using orthogonality properties of the buckling modes. The geometric imperfection is obtained from the buckling mode by a suitable scaling procedure using a generalization of Dutheil's method. The proposed method can be applied easily to the design of practical structures because of its compatibility with design code requirements and its simplicity. The method can be used for practical frame designs without tedious separate member capacity checks.
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