Required and available rotations in continuous composite beams with semi-rigid connections

The need to match the rotations required for redistribution of elastically calculated support moments in composite frames with the available inelastic rotation in those regions is highlighted. By defining the former purely in terms of the loading arrangement and structural configuration and the latter in terms of the properties of the various structural elements (beams, joints and columns), the contributions of items other than joint rotation is clarified. Relatively simple theory is used to quantify both aspects, with the approach being validated against appropriate test results. (C) 2001 Elsevier Science Ltd. All rights reserved.