Research Article
Jul 1977
Evaluation of Fracture of Lafayette Street Bridge
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VIEW THE REPLYPublication: Journal of the Structural Division
Volume 103, Issue 7
Abstract
A main girder of the Lafayette Street Bridge over the Mississippi River in St. Paul was discovered to be cracked on May 7, 1975. A detailed examination of the fracture is given in this paper. Fractographic examinations and analyses of crack growth showed that fatigue crack growth and brittle fracture both contributed to the members' failure. Fatigue cracks were found to originate at large lack of fusion areas in the lateral bracing gusset to transverse stiffener weld. After the crack had nearly penetrated the web thickness, it precipitated a brittle fracture. Subsequent intervals of fatigue crack growth and fracture were also observed. Recommendations are also provided on ways to retrofit the bridge details to prevent reoccurrence at other comparable details. In addition, a suggested detail configuration for this type of connection is recommended for future use.
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Information
Published In
Journal of the Structural Division
Volume 103 • Issue 7 • July 1977
Pages: 1339 - 1357
Copyright
© 1977 American Society of Civil Engineers.
History
Published in print: Jul 1977
Published online: Feb 1, 2021
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Authors
Affiliations
John W. Fisher, F.ASCE
Prof. of Civ. Engrg. and Dir., Fritz Engrg. Lab., Lehigh Univ., Bethlehem, Pa.
Richard Roberts
Prof. of Mech. Engrg. and Mechanics, Lehigh Univ., Bethlehem, Pa.
Alan W. Pense
Prof. of Metallurgy and Materials Sci., Lehigh Univ., Bethlehem, Pa.
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.