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Title: Web crippling behaviour of cold-formed thin-walled steel lipped channel beams
Author: Heiyanthuduwage Don, Manoj Arunajith
Awarding Body: Glasgow Caledonian University
Current Institution: Glasgow Caledonian University
Date of Award: 2008
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The aim of this research work was to investigate web crippling behaviour of coldformed thin-walled steel lipped channel beams employing experimental, numerical and theoretical techniques. The relevant literature reveals that the majority of contemporary design codes do not provide accurate and reliable web crippling strength predictions for a wide range of section parameters and section types. The leading design codes contain empirically-based web crippling design rules adopted from the results of numerous experiments conducted in the past. The design rules, based on physical models, can represent the true contribution of individual parameters, and are believed to produce reliable results. Modem analysis tools such as the finite element method have proved to produce satisfactory results for many different types of complex structural failures. Four series of tests were performed to examine web crippling behaviour of lipped channel specimens with varying cross-section dimensions. Each series focused on a particular loading condition where web crippling is known to occur. The loading was applied using three different load bearing plates, and load-displacement graphs were obtained during the tests. A comprehensive nonlinear finite element analysis was performed to simulate the web crippling failure examined in the experiments. Nonlinear features such as geometric and material nonlinearity, and contact situations were considered to simulate the failure mechanisms involved in web crippling. The finite element models were calibrated using the test results and employed for a parametric study. The results proved that the finite element models were capable of providing accurate and reliable web crippling strength predictions. The web crippling strength predictions of the AISI Specification, BS5950 Part 5 and Eurocode 3 Part 1.3 were compared with the experimental results. The comparisons revealed considerable underestimations in many cases. Modifications were proposed to the web crippling design rules examined in this research, and an alternative d.e sign rule was suggested based on the results of the parametric study. Furthermore, an analysis which employed the elastic theory and the plastic mechanism approach was examined. However, this approach resulted in significant overestimations of the ultimate strength of members subjected to web crippling.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available