Structural performance of rotationally restrained steel columns in fire

The paper represents the outcomes of a parametric experimental investigatio n on the performance of rotationally restrained steel columns in fire. This experimental programme is a part of major research project performed at th e Fire Research Center, University of Ulster in collaboration with the Univ ersity of Sheffield. As a part of steel frames, half scale steel columns we re tested in fire under two values of rotational restraint 0.18 and 0.93 an d one value of axial restraint of approximately 0.29. Each case of rotation al restraint was tested under five loading levels 0, 0.2, 0.4, 0.6 and 0.8. The paper includes a comparison with the behavior of a steel column previo usly tested in fire under axial restraint only. The paper represents also a method of estimating the effective length of fixed end (partial fixity) co lumns tested under fire. (C) 2001 Elsevier Science Ltd. All rights reserved .