United States Department of Transportation
i
Heat-straightening effects on the behavior of plates and rolled shapes : volume 2 : second interim report of phase 1.
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1987-08-01
[PDF-5.50 MB]
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Alternative Title:Heat-straightening effects on the behavior of plates and rolled shapes.
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Abstract:One of the primary reasons that highway departments are hesitant to use heat-straightening techniques to repair damaged steel girders is the lack of experimental verification of the process. A comprehensive experimental program on the subject has been in progress at LSU for two years. Presented in this report are the results of laboratory experiments on plates and rolled shapes, along with an evaluation of material behavior. The current state of knowledge is reviewed as to the effects of heat applications on the metallurgical properties of steel (including residual stresses) as well as the effects of cold working during damage inducement. A discussion of criteria required to make the repair decision is also presented.
Experimentally evaluated are the effects of temperature, vee angle, jacking force, and depth of vee on the behavior of both plates and rolled shapes. Over 100 plates have been measured along with approximately 20 rolled shapes. Residual stress measurements were also taken which show a distinct variation over typical cross sections. While the experimental program is still incomplete, the results presented include more laboratory testing than all projects combined.
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