International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 07 | July 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 979 Web Crippling Capacity of Cold Formed Steel Channel Sections With and Without Openings Amalu Grace Lal 1 , Neethu Joseph 2 1 Student, Dept. of Civil Engineering, St.Joseph’s College of Engineering& Technology, Kerala, India 2 Asisstant Professor, Dept. of Civil Engineering, St.Joseph’s College of Engineering& Technology, Kerala, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Steel is an important construction material since ancient days. Among steel, Cold Formed Steel (CFS) are getting more popular due to its advantages including light weight, high strength to weight ratio, resistance to fire etc. These are the sections which are shaped near room temperature. CFS channel sections are commonly used nowadays as bearing and non- load bearing walls, partition walls, in multi-rise buildings, framings. In this channel sections the holes are provided in the web portion for plumbing services and installation of ducts. However such opening made the section more vulnerable to failures including web crippling and web buckling. In this paper various parameters which affect the web crippling capacity of the channel sections are analyzed and the analysis is also done to find the optimum location of web holes in the channel sections. Key Words: Cold Formed Steel Sections, Web Crippling, Web Buckling 1. INTRODUCTION Advanced structures are quite common in nowadays due to growth in construction industry, Due to this advancement many industries are looking forward to develop and use sustainable building materials. Steel is an important construction material using nowadays due to its innumerable advantages which make it as a perfect option for modern building construction. There are mainly 2 types of steel used for the construction purposes. 1) Hot Rolled Steel Sections 2) Cold Formed Steel Sections. As the name indicates, CFS sections are the sections which are rolled, bended, pressed or shaped at near room temperature. We do not need to provide extra heat for shaping them as it is required in hot rolled steel sections. In hot rolling process steel is rolled by providing high temperature which is more than 1700 Fahrenheit. But such hot rolled steel have a tendency to shrink when cool off, thus giving less control on size and shape. Advantages of CFS sections over Hot Rolled Steel Sections includes CFS does not shrink, no heat is required to form shape, light weight, non- combustible, won’t absorb moisture, resist fire and termites and high strength to weight ratio. Nowadays openings are provided in the web portion of channel section for ease of installation of electrical or plumbing devices. Such holes result in the sections becoming more vulnerable to failures especially under concentrated loads applied near the web holes. Two common type of failures in CFS sections include 1) Crippling Fig -1: CFS in Construction Industries 1.1 Aim To perform the analysis on web crippling capacity of cold formed channel sections with and without opening 1.2 Objective To understand effect of bearing length, inside bent radius, web depth and flange width on web crippling capacity of channel sections. To study effect of web opening and web opening locations in the web crippling and buckling capacity of the channel sections 1.3 Methodology 1) Modeling and analysis of channel sections with and without hole in ANSYS Workbench by varying parameters Failure 2) Buckling Failure. Web crippling failure occurred in CFS members at the web flange junction. This failure is mainly seen in the web elements due to the concentrated loads which are delivered through flange of the channel sections. The main reason for this failure is due to the application of static and dynamic loads transversally which causes direct crushing of web. Buckling is another failure mode in CFS sections due to its thin walled cross section causing loss of stability. This failure occurs when the critical buckling stress in web is less than the compressive stress acting vertically. It occurs before yielding.