The Structural Engineer > Archive > Volume 72 (1994) > Issues > Issue 4 > Column Base Restraint Effect for a Steel Portal Frame
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Column Base Restraint Effect for a Steel Portal Frame

The actual flexibility of nominally ‘rigid’ connections and the actual stiffness of nominally ‘pinned’ bases can have a major effect on the accuracy of prediction of structural deflections under service load conditions. Connection flexibility tends to increase deflections, but base stiffness usually will reduce deflections. Both can be important factors in the acceptability of calculated predictions, particularly for large-span, lowrise portal frame structures for which end wall and roof sheeting and bracing stiffness play a minor role in providing lateral stiffness. Professor R.E. Melchers and G. Maas, BE

Author(s): Melchers, R E;Maas, G

Keywords: steel;portal frames;columns;bases;stiffness;restrained;wind loads;flexibility;effects;forecasting;behaviour;load tests;insitu;mathematical models