Author : Amirmohammad Yousefi
Publisher :
ISBN 13 :
Total Pages : 247 pages
Book Rating : 4.:/5 (111 download)
Book Synopsis Web Crippling Behaviour and Design of Cold-formed Ferritic Stainless Steel Channels by : Amirmohammad Yousefi
Download or read book Web Crippling Behaviour and Design of Cold-formed Ferritic Stainless Steel Channels written by Amirmohammad Yousefi and published by . This book was released on 2019 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design guidance for web crippling behaviour of cold-formed stainless steel channel members that is given in the relevant design standards has been determined empirically from experimental studies and theoretical analyses. This guidance has been developed for cold-formed carbon steel members. Applying this design guidance to cold-formed stainless steel channel members based on carbon steel results is potentially inaccurate due to the very different stress-strain characteristics of stainless steel compared with that for carbon steel. These differences are principally in carbon steel having a clearly defined yield point, compared with stainless steel and in stainless steel having significant strain hardening when behaving inelastically compared with carbon steel. This means that new guidance must be developed for safe and efficient design of cold-formed stainless steel channels subject to web crippling. The primary objective of the research undertaken which is described in this thesis has been to develop design equations for web crippling of cold-formed ferritic stainless steel channels, with and without circular web perforations, under interior-one-flange, end-one-flange, interior-two-flange and end-two-flange loading. This involved first 216 laboratory tests, covering the cases of flanges restrained and unrestrained to the load or reaction plates. Finite element models were developed and validated against these tests and then used to expand the scope of the study with 3,600 finite element results. The finite element results use nonlinear quasi-static finite element analysis with an implicit integration scheme, which has advantages over static and quasi-static with an explicit integration scheme analyses. The laboratory and finite element results have been used to propose design rules that can be incorporated into design practice and design standards, and which make a distinction between flanges restrained and unrestrained to the load or reaction plates and address the presence of circular web perforations. Neither of these are currently covered in any design standards. The web crippling strengths for the flanges unrestrained and restrained cases were found to be either too conservative or unreliable, when compared to the provisions of stainless steel design standards. Web crippling design equations and strength reduction factors are proposed that are shown to be reliable and conservative when compared against laboratory and numerical results.