Structural Design for Stability of Members
In a narrow sense, structural design is an art that is concerned with determination of minimum cross-sectional geometries of structural members based upon the results of structural analysis using acceptable performance criteria such as allowable stress, ultimate strength, maximum deformation, stiffness or stability etc. For the stress or strength and deformation the design procedures are straight forward which ensure the realization of a particular desired state for given loading. It is very rare when stability is the controlling condition; therefore objective is to have more than a predetermined reserve in capacity to preclude possibility of instability at the given loading. In the other words a margin of safety has to be provided. When buckling is a controlling factor, the problem can be handled by adding supporting or bracing members or a sufficiently large cross-section can be selected thereby eliminating buckling as a real problem. The choice will be governed by economy and practicality of the solution.
KeywordsSlenderness Ratio Allowable Stress Bottom Flange Axial Thrust Vertical Stiffener
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