Design of concentrically braced steel frames for earthquakes

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dc.contributor.advisorBrown, Thomas G.
dc.contributor.authorHaddad, Madhar Ameel
dc.date.accessioned2005-08-08T20:20:51Z
dc.date.available2005-08-08T20:20:51Z
dc.date.issued2004
dc.descriptionBibliography: p. 297-301.en
dc.description.abstractThe west coast and eastern zones of Canada are susceptible to earthquakes such as those that have happened in California. Braced frame construction is advantageous in reducing earthquake-induced displacements, but is susceptible to loss of ductility, currently attributed to brace behaviour. A numerical model has been developed that is capable of accurately simulating the hysteresis behaviour of bracing members. The factors that affect that behaviour can therefore be studied without conducting expensive experimental tests. The three-dimensional, nonlinear, elasto-plastic finite element model has been used to simulate the behaviour of hollow structural steel (HSS) tubes connected to gusset plates at their ends when subjected to reversed axial displacements. A combined orthotropic kinematic hardening material model was used. Four-node, finite membrane strain quadrilateral shell elements were used to model both the HSS and the gusset plate. Fixed boundary conditions were applied at the ends of the specimens with axial displacements imposed for each cycle. The model was able to simulate the hysteresis behaviour of previously tested bracing members (Shaback 2001) in terms of the peak loads and displacements, energy dissipation, fracture life and the degradation of both strength and stiffness. Based on the results of the parametric study carried out using the finite element model, a total of 10 concentric braces were tested in the structural engineering laboratory at the University of Calgary. The braces were designed according to the weak brace/strong gusset concept. The objectives of the experimental study were to quantify the effects of displacement history, gusset plate thickness, and effective slenderness ratio, on the energy dissipation capacity and fracture life of these braces. The results showed good agreement with findings from previous studies at this university. The finite element model was refined to include a damage accumulation model for low-cycle fatigue. The model provided new insight for analysis of load-displacement hysteresis curves. New fracture life and energy life equations are thus proposed, based on a better understanding of the important parameters influencing brace behaviour.en
dc.format.extentxxxii, 301 leaves : ill. ; 30 cm.en
dc.identifier.citationHaddad, M. A. (2004). Design of concentrically braced steel frames for earthquakes (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/18398en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/18398
dc.identifier.isbn0612935019en
dc.identifier.lccAC1 .T484 2004 H33en
dc.identifier.urihttp://hdl.handle.net/1880/40326
dc.language.isoeng
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.titleDesign of concentrically braced steel frames for earthquakes
dc.typedoctoral thesis
thesis.degree.disciplineCivil Engineering
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameDoctor of Philosophy (PhD)
ucalgary.item.requestcopytrue
ucalgary.thesis.accessionTheses Collection 58.002:Box 1505 520492022
ucalgary.thesis.notesUARCen
ucalgary.thesis.uarcreleaseyen
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