Alberta regulates rides under the safety codes act.
http://www.qp.alberta.ca/documents/Regs/2001_223.pdf
It references an ASTM standard for inspection F2783. Unforntuately you need a subcription to access that standar but in general ASTM standards are of high engineering quality and reviewed and edited regularly by industry and academic experts.
I looked for and found the stampede failure report. Cause was fatigue cracking which should have been caught by inspection.
http://calgary.ctvnews.ca/mobile/sco...eased-1.622843