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Effects of Realistic Heat-Straightening Repair on Damaged Steel Beams

Realistic implementation of heat straightening in the field can include imperfections such as temperatures much higher or lower than recommended values, overstraining, mechanical hot bending, and multiple heat straightening. Experimental investigations were performed to evaluate the effects of realistic heat straightening with imperfections on damaged steel beams. Six steel beam specimens were fabricated from A36 steel plates and tested to evaluate the effects of various damage and repair parameters on realistic heat-straightening repair. Test specimens were statically damaged by using a hydraulic actuator, and heat-straightening repaired by applying Vee heats and restraining forces in the plastically deformed region. The damage and repair parameters considered in the test were damage magnitude, restraining force, maximum heating temperature, and number of multiple damage–repair cycles. The material properties, including the structural properties, and the fracture toughness of the damaged–repaired beam specimens were determined and evaluated. Specimens subjected to overheating (up to 1,400°F) during repair and those subjected to heating up to 1,200°F had similar structural properties and fracture toughness values after repair. Specimens subjected to one or three damage–repair cycles had similar structural properties and fracture toughness. However, specimens subjected to mechanical hot bending [i.e., heat-straightening repair with underheating (temperature less than 1,000°F and excessive restraining force over 50% of the plastic moment capacity of the section)] had poor fracture toughness values.