Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.720220
Title: Synergistic response of steel structures to thermal and blast loading
Author: Clough, Laurence George
Awarding Body: University of Southampton
Current Institution: University of Southampton
Date of Award: 2017
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Abstract:
This research project investigates the thermo-mechanical non-linear response of steel structures to combined long duration ( > 200msec) blast and thermal loads. Depending upon explosive size and standoff distance the thermal load can reach, and degrade a structure prior to the arrival of the blast load. The thermal load produced by explosive events can damage steel structures such that the damage from the combined thermal and subsequent blast load would be greater than or different to, the damage from the blast load alone. Parametric studies presented in this thesis examine the response of structural steel columns to a range of blast and thermal loading regimes and investigate the effect of parameters including connection type, compressive loads and thermal conductivity. Data from previous research is used to develop predictive algorithms calculating the thermal and blast load regimes from explosive events. Transient, non-linear, coupled (thermal and structural) analyses using the finite element analysis (FEA) program, LUSAS are performed on the structural steel columns. The design of, and results from a series of trials recording temperatures, thermal flux and pressures, and observing the response of 2mm thick steel plates, within a 41kg TNT equivalent (eq.) explosive fireball, is presented. The design of, and results from experimental trials investigating the response of structural steel columns to combined thermal, compression and long duration blast loads within an Air Blast Tunnel (ABT) are also presented. Results from both sets of trials are compared to predictive non-linear FEA models of the steel plates and columns, developed to provide verification of computational procedures used throughout the research project. Resistance curves for the vulnerability analysis of whole buildings to explosive events are presented. The curves represent the elastic and plastic failure mechanisms of structural columns to thermal and blast explosive loads. This research project demonstrates that under specific loading regimes steel structures can exhibit a thermo-mechanical, synergistic response to combined thermal and blast loads from explosive events. This has been achieved through detailed investigation into previous research, thorough and comprehensive parametric studies and a series of innovative experimental trials using M.O.D national testing facilities.
Supervisor: Clubley, Simon Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.720220  DOI: Not available
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