A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Distortion-Induced Fatigue Cracking in Steel Bridges
The research described in the report is the result of a review of existing experimental field studies and experimental work performed in the laboratory under NCHRP Project 12-28(6). It provides a detailed review of past experimental studies undertaken on a variety of bridges that had experienced fatigue cracking as a result of web gap distortion. The types of structures covered in the review included girder-floorbeam bridges, multigirder bridges, box girder bridges, and tied-arch bridges with box girder tension ties. Field measurements indicated that the highest cyclic stresses occurred in the web, adjacent to the top flange, in the gap between the flange plates connecting floorbeams to the girder. Large cyclic stresses in the web were also caused by floorbeams connected to box tie-girder members in tied-arch bridges when internal diaphragms in the box ties were not attached to the flanges. Multigirder bridges without staggered diaphragms were found to have cyclic stress about half the magnitude of the floorbeam-girder bridges. As a result cracking took longer to develop and was not as extensive as was observed in the floorbeam-girder bridges.
Distortion-Induced Fatigue Cracking in Steel Bridges
The research described in the report is the result of a review of existing experimental field studies and experimental work performed in the laboratory under NCHRP Project 12-28(6). It provides a detailed review of past experimental studies undertaken on a variety of bridges that had experienced fatigue cracking as a result of web gap distortion. The types of structures covered in the review included girder-floorbeam bridges, multigirder bridges, box girder bridges, and tied-arch bridges with box girder tension ties. Field measurements indicated that the highest cyclic stresses occurred in the web, adjacent to the top flange, in the gap between the flange plates connecting floorbeams to the girder. Large cyclic stresses in the web were also caused by floorbeams connected to box tie-girder members in tied-arch bridges when internal diaphragms in the box ties were not attached to the flanges. Multigirder bridges without staggered diaphragms were found to have cyclic stress about half the magnitude of the floorbeam-girder bridges. As a result cracking took longer to develop and was not as extensive as was observed in the floorbeam-girder bridges.
Distortion-Induced Fatigue Cracking in Steel Bridges
J. W. Fisher (author) / J. Jin (author) / D. C. Wagner (author) / B. T. Yen (author)
1990
50 pages
Report
No indication
English
Highway Engineering , Construction Equipment, Materials, & Supplies , Fatigue(Materials) , Cracking(Fracturing) , Bridges(Structures) , Steel structures , Distortion , Field tests , Girder bridges , Displacement , Plates(Structural members) , Experimental data , Mechanical properties , Beams(Supports) , Cracks , Joints(Junctions)
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