Experimental Investigation of Flexural Behaviour of Cold Formed Built-Up Channel Section Subjected to Fire

Abstract

The cold-formed steel is becoming popular in construction industry because of its various advantages and exibility in use. The cold-formed steel is manufac- tured and molded in desired shape at room temperature hence there is a need to study the behavior of cold-formed steel at high temperature. Most of the research has been already done on various properties of cold-formed steel at high tempera- ture like ductility, stress strain curve, etc. but the study on exural strength and maximum de ection is yet to be done. Therefore in this project the properties like ultimate load, exural strength, maximum de ection and weight change are studied at temperature up to 5500C. I-section beams were subjected to the various temperatures at 1000C, 2500C, 4000C and 5500C. After cooling the exure tests were performed on beams in Universal Testing Machine. From the experiments it was observed that, the ultimate load and exural strength reduces as tempera- ture goes on increasing due deterioration in properties of cold-formed steel at high temperature, while the maximum de ection increases and there is no any weight change of cold-formed steel due to increase in temperature.