dc.contributor.advisor | Bennett, Caroline R. | |
dc.contributor.advisor | Matamoros, Adolfo | |
dc.contributor.author | Nagati, Amr Daniel | |
dc.date.accessioned | 2012-10-27T09:59:24Z | |
dc.date.available | 2012-10-27T09:59:24Z | |
dc.date.issued | 2012-08-31 | |
dc.date.submitted | 2012 | |
dc.identifier.other | http://dissertations.umi.com/ku:12266 | |
dc.identifier.uri | http://hdl.handle.net/1808/10194 | |
dc.description.abstract | Several studies have identified distortion-induced fatigue as the leading cause of cracks in steel bridges built prior to the mid-1980s. Experimental and computer simulations of 914-mm (36-in.) deep girder-cross frame subassemblies subjected to cyclic loading were carried out to study the effects of distortion-induced fatigue and to evaluate the effectiveness of various retrofit measures. Previous repair methods for distortion-induced fatigue damage have attempted to reduce the stress demand at the critical web-gap region by increasing the flexibility of the girder web in the out-of-plane direction or by restraining the lateral motion of the web by fixing the connection stiffener to the girder flange. A new approach was investigated in this study intended to reduce the stress demand in the web-gap region by re-distributing the out-of-plane force transferred through the girder-cross frame connection over a larger area of the girder web. A new retrofit measure is proposed based on this approach, which consists of adding steel angles connecting the girder web and the connection plate (CP), and a steel plate on the back side of the girder web to distribute the lateral force over a wider region of the web. Experimental and computer simulation results are presented showing that this repair method is very effective in preventing the growth of horseshoe-shaped cracks around the web cross-frame connection and of horizontal cracks near the junction between the flange and web. | |
dc.format.extent | 90 pages | |
dc.language.iso | en | |
dc.publisher | University of Kansas | |
dc.rights | This item is protected by copyright and unless otherwise specified the copyright of this thesis/dissertation is held by the author. | |
dc.subject | Civil engineering | |
dc.subject | Bridge | |
dc.subject | Cfrp | |
dc.subject | Distortion | |
dc.subject | Fatigue | |
dc.subject | Load cell | |
dc.subject | Retrofit | |
dc.title | Repair of Steel Bridge Girders Damaged by Distortion-Induced Fatigue | |
dc.type | Thesis | |
dc.contributor.cmtemember | Rolfe, Stanley | |
dc.contributor.cmtemember | Barrett-Gonzalez, Ron | |
dc.thesis.degreeDiscipline | Civil, Environmental, & Architectural Engineering | |
dc.thesis.degreeLevel | M.S. | |
kusw.oastatus | na | |
kusw.oapolicy | This item does not meet KU Open Access policy criteria. | |
dc.rights.accessrights | openAccess | |