Warping analysis of concrete cores

Abstract

AbstractWhen a substantial torsional moment is present, the magnitude of the longitudinal stresses on the core walls due to warping and the header beam forces are quite significant and those actions are too large to be neglected. Many methods developed for warping analysis of concrete cores are either not applicable for complex core structures or difficult to adopt in normal design offices because they are not versatile enough for practical applications. Also, models based on either open sections or completely closed sections may be grossly inaccurate for partially‐closed core sections. A simple method of analysis for estimating the longitudinal stresses on walls and header beam forces for torsionally loaded concrete cores is presented in a manner suitable for use in design offices. In this method, an open section with the header beams is converted to an appropriate continuous continuum through an equivalent thickness element. This method of analysis is found to be very versatile and may be used in both preliminary and final design stages. In order to illustrate the application of the proposed model, and to evaluate the contribution of the parameters involved, a case study is presented. Copyright © 2001 John Wiley & Sons, Ltd.