Steel Bridge Erection Practices (2005) / Chapter Skim
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Pages 16-18
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From page 16... ...
Respondents reported problems relating to girder stability owing to wind, crossframe erection sequences, temporary supports, and deck pouring sequence. Considerations toward solving the problems could include: • Verification of stability in using the pouring sequence in positive moment areas, • Checking for stability of the cantilever end of girder field section from pier to field splice, • Checking the member length-to-flange-width ratio (several states provide guidance with preferable values between 80 and 90)
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From page 17... ...
• Check the ratio of member length-to-flange width for erection stability, • Install enough crossframes to avoid flange buckling owing to the dead load of steel and concrete, • Verify the stability of the partially erected structure for wind loading, and • Use falsework as appropriate. Geometry control should be maintained at all stages of erection.
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From page 18... ...
Without such analyses for certain types of structures, problems of fit can be expected and, as the responses suggested, they do occur. The problems are exacerbated by stage construction.
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