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Distortion Induced Fatigue Cracking Of Girder To Crossbeam Connection
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Book Synopsis Distortion-induced Fatigue Cracking of Girder-to-crossbeam Connection by : Dhari S. Aljutaili
Download or read book Distortion-induced Fatigue Cracking of Girder-to-crossbeam Connection written by Dhari S. Aljutaili and published by . This book was released on 2008 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oregon Department of Transportation's bridge no. 9743b is a multi-span, two-girder steel deck bridge connecting the busy interstates 5 and 205. Vertical cracks have been detected in the welded girder-to-crossbeam connections at the bents. Distortion-induced fatigue is suspected to be responsible for the cracking. Linear elastic beam analysis, 2-D and 3-D finite element analyses, and fatigue analysis were performed to determine the fatigue life of the connection based on highway moving loads and actual truck traffic data. Results of the analyses are discussed, and insight about the possible causes of distortion-induced fatigue cracking is presented. In conclusion, the live truck loading is ruled out as the cause, and the problem is narrowed down to the thermal loads.
Book Synopsis Distortion-induced Fatigue Cracking in Steel Bridges by : John W. Fisher
Download or read book Distortion-induced Fatigue Cracking in Steel Bridges written by John W. Fisher and published by Transportation Research Board National Research. This book was released on 1990 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue cracking at cross beam connections in steel plate girder bridges by : Keizo Otsuka
Download or read book Fatigue cracking at cross beam connections in steel plate girder bridges written by Keizo Otsuka and published by . This book was released on 1995 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Distortion-induced Fatigue Cracking in Steel Bridges by : John W. Fisher
Download or read book Distortion-induced Fatigue Cracking in Steel Bridges written by John W. Fisher and published by Transportation Research Board. This book was released on 1990 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Field Tests of Distortion-induced Fatigue Cracking in Diaphragm-girder Connections for Multi-girder Bridges by : David Allen Lower
Download or read book Field Tests of Distortion-induced Fatigue Cracking in Diaphragm-girder Connections for Multi-girder Bridges written by David Allen Lower and published by . This book was released on 1995 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis of Distortion-induced Fatigue Cracking of a Trapezoidal Steel Box Girder Bridge Including Retrofit Investigation by :
Download or read book Analysis of Distortion-induced Fatigue Cracking of a Trapezoidal Steel Box Girder Bridge Including Retrofit Investigation written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Distortion induced fatigue is a common problem for aging steel bridges. The distortion creates secondary bending stresses at web gap locations that are not accounted for in design, thereby initiating fatigue cracks. A large number of such distortion-induced fatigue cracks have recently been found on Delaware Bridge 1-501 in Newport, Delaware. This multi box steel tub girder bridge has cracking that has initiated in the weld which connects the web to the internal bracing via connection plates. To investigate this problem, global finite element models of two of the bridge's spans were created. In order to calibrate the models for use in analysis, a diagnostic load test was performed using strain transducers to measure strains associated with bending of the girders. Once the models were found to reasonably represent the actual response of the structure, the model was then refined for local modeling of the web gap region. As expected, stresses within the gap were found to be large. Reduction of the stresses within these gap locations is required to increase the remaining life of the bridge. Several retrofit methods were designed to accomplish this stress reduction, based on effective retrofits used to correct similar problems in the past. These retrofit methods include drilling holes at the crack tips, positively attaching the connection plates to flanges, increasing the length of the web gaps, and removing the diagonal elements in the diaphragms. The retrofits were modeled and analyzed under fatigue loading and the resulting stresses were compared to the original structure. Of these methods, the positive attachment was found to be most effective in reducing the web gap stresses; however, all of the approaches provided significant reductions in the stress range. Recommendations for applying this type of retrofit detail along with the drilling of holes at the end of crack tips are provided.
Book Synopsis Analysis of Distortion-induced Fatigue Cracking in a Steel Trapezoidal Box Girder Bridge by :
Download or read book Analysis of Distortion-induced Fatigue Cracking in a Steel Trapezoidal Box Girder Bridge written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2006, a consulting firm was hired to perform an in-depth interior box inspection on Delaware Department of Transportation (DelDOT) Bridge Number 1-501, also known as the Newport Viaduct. Upon inspection, 655 fatigue cracks were observed, occurring at the weld metal between the transverse cross frame connection plate and girder webs. At the cracked locations, a 2.5 in. web gap exists between the connection plate termination and the girder flanges. This is a known fatigue prone detail that has been widely documented to be susceptible to out-of-plane deformation and distortion-induced fatigue. Although the mode of cracking is relatively familiar, there are remaining questions that should be answered to ensure the proper functioning of the structure. Specifically, is the observed fatigue cracking consistent with expected behavior? Secondly, should additional cracks be expected to initiate in locations that currently do not have observable cracks? These questions were approached by focusing on a portion of the overall structure, Spans 9-11 in the southbound direction. Field testing was performed to capture the in-situ response of the structure to known live loads via the implementation of 23 strategically placed strain transducers. The field testing was used to calibrate and validate a finite element model. The finite element mesh was constructed using the FEMAP preprocessor and solved using ABAQUS. Sensitivity analyses were performed on the model to investigate the influence of the transverse truck position within the travel lane, the concrete deck stiffness, and the concrete parapets. The results of each analysis showed that the finite element model was insensitive to variations in transverse truck position, concrete stiffness, and the exclusion of the parapets. The finite element model was ultimately utilized to perform a fatigue evaluation. The fatigue evaluation showed that fatigue cracking is within reason given the stress range and the number of accumulated stress cycles from lifetime truck traffic on the structure. The fatigue evaluation and anticipation of future cracking establishes the need for developing crack retrofit and mitigation strategies for the web gap details within the structure. These strategies will extend the longevity of the bridge and enable it to remain in service.
Book Synopsis Research Project 89-19 by : John M. Kulicki
Download or read book Research Project 89-19 written by John M. Kulicki and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Deformation Induced Cracking in Steel Girder Bridges and Retrofit Guidelines by :
Download or read book Deformation Induced Cracking in Steel Girder Bridges and Retrofit Guidelines written by and published by . This book was released on 1987 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Behavior of Distortion-induced Fatigue Cracks in Bridge Girders by : Robert Edward Kenneth Fraser
Download or read book Behavior of Distortion-induced Fatigue Cracks in Bridge Girders written by Robert Edward Kenneth Fraser and published by . This book was released on 2000 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Finite Element Analysis of Fatigue Prone Details of the Tuttle Creek Bridge by :
Download or read book Finite Element Analysis of Fatigue Prone Details of the Tuttle Creek Bridge written by and published by . This book was released on 2007 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many older steel girder bridges exhibit distortion-induced fatigue cracking at the cross-frame to girder connections. In a two-girder bridge like the Tuttle Creek Bridge there are no redundant load paths and this problem is of even greater concern. The primary girders of the bridge structure are fatigue critical elements and even when such cracks are relatively small they must be examined extensively. The Tuttle Creek Bridge, built in 1962, developed distortion-induced fatigue cracks in the web gap region. The crack prevention repairs of 1986 were not effective and continued crack growth was observed. The bridge was again repaired recently in the summer of 2005. A finite element study is performed in this study for a typical intermediate girder span, to characterize the behavior of fatigue critical details and to evaluate the effectiveness of the newly installed retrofits. A dual-level finite element analysis was performed using macro-level models of the entire bridge structure and micro-level models of some portions of the bridge under investigation. The finite element procedure was found to be efficient and accurate. The models were calibrated using field strain data obtained from two field tests done before and after the retrofits. The analytical results were in good agreement with the measured field data. The analysis shows that the top flange web gap region is the most susceptible to distortion-induced fatigue. The study successfully explains the observed crack patterns on the bridge. The study indicates a significant reduction in web gap stresses after the retrofit. The retrofit also reduces stresses in the gusset plate region and eliminates the stress concentration near the weld terminations. Based upon the most critical detail and assuming that the traffic volume doubles from the present ADTT of 65, the service life of the bridge is estimated to be over one hundred years.
Book Synopsis Distortion-induced Fatigue Cracking in Steel Bridges by : Transportation Research Board
Download or read book Distortion-induced Fatigue Cracking in Steel Bridges written by Transportation Research Board and published by . This book was released on 1990 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Enhancement of Welded Steel Bridge Girders Susceptible to Distortion-induced Fatigue by :
Download or read book Enhancement of Welded Steel Bridge Girders Susceptible to Distortion-induced Fatigue written by and published by . This book was released on 2014 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this study was to develop and evaluate the performance of retrofit techniques for existing steel bridges that have already sustained damage due to distortion-induced fatigue, or are anticipated to experience distortion-induced fatigue cracking within their design life. A second goal was to evaluate the use of new technologies and materials for repairing distortion-induced fatigue damage in steel bridges. While a number of retrofit techniques exist for repairing distortion-induced fatigue cracking, many of them require partial or full bridge closure to perform the repair. The retrofits developed under this project are intended to be able to be installed with minimal disturbance to traffic. Four primary subject matters are reported on within this document: (1) the development of the "angles-with-plate" distortion-induced fatigue repair; (2) development of fiber reinforced polymer (FRP) repairs for distortion-induced fatigue and in-plane fatigue; (3) development of Piezoelectric Induced Compressive Kinetics (PICK) technology for treatment of crack-arrest holes; and (4) a series of analytical investigations aimed at better understanding distortion-induced fatigue susceptibility of skewed bridge systems.
Book Synopsis Behaviour of Distortion-induced Fatigue Cracks in Bridge Girders by :
Download or read book Behaviour of Distortion-induced Fatigue Cracks in Bridge Girders written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Review of Field Measurements for Distortion - Induced Fatigue Cracking in Steel Bridges by : John W. Fisher
Download or read book Review of Field Measurements for Distortion - Induced Fatigue Cracking in Steel Bridges written by John W. Fisher and published by . This book was released on 1987 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :D'Andrea, Mark Publisher :National Library of Canada = Bibliothèque nationale du Canada ISBN 13 : Total Pages :146 pages Book Rating :4.:/5 (2 download)
Book Synopsis Behaviour and Rehabilitation of Distortion-induced Fatigue Cracks in Bridge Girders by : D'Andrea, Mark
Download or read book Behaviour and Rehabilitation of Distortion-induced Fatigue Cracks in Bridge Girders written by D'Andrea, Mark and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 2001 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Field Tests of a Lengthened Web Gap Retrofit for Distortion-induced Fatigue Cracking by : Scott Kipling Rutland
Download or read book Field Tests of a Lengthened Web Gap Retrofit for Distortion-induced Fatigue Cracking written by Scott Kipling Rutland and published by . This book was released on 1993 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
