Brittle Fracture of Structural Steel
Brittle Fracture of Structural Steel
(OP)
Are there any guidelines for designing structural steel to be suitable in cold climates? I'm speaking primarily to the issue of brittle fracture. I know the ASME pressure vessel code has a lot of brittle fracture criteria for vessel design, but I'm trying to find similar design information for structures?
I have a steel lattice tower going into Canada, and can not seem to find any information (US or Canadian) on how to address the brittle fracture concern on the structural members.
I have a steel lattice tower going into Canada, and can not seem to find any information (US or Canadian) on how to address the brittle fracture concern on the structural members.






RE: Brittle Fracture of Structural Steel
RE: Brittle Fracture of Structural Steel
1. LAST Requirements---CVN at lowest anticipated service temperature. What is the LAST...what CVN value are you specifying..20 ft-lbs?
2. WPS developed by qualification testing which takes CVN into account
RE: Brittle Fracture of Structural Steel
RE: Brittle Fracture of Structural Steel
RE: Brittle Fracture of Structural Steel
In the Pressure Vessel Code (ASME Sec. VIII Div. I, Fig. UCS 66.1) it gives a way that you can rerate materials to a lower design temperature, based upon the stress level that you have in the part. In order to have a brittle fracture, you need tensile stress, if your tensile stress is low then it is less likely that you will have a brittle fracture. Therefore, lets say you are at 50% of the allowable tensile stress, the curve lets you derate the Minimum Design Metal Temperature for the material X Degrees.
Are there any similar methods available for structural applications? Pressure vessels are usually governed by tensile stress, but many components in structures are governed by compression and buckling, so is brittle fracture always considered when designing structures in low temp environments? Other than throwing money at the problem with more exotic materials, are there other more economical methods to design the structure for low temp?
Are the towers and other structures built in Canada, built using structural steels rated to lower temperatures?
RE: Brittle Fracture of Structural Steel
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