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RE: Design Charts (was RE: Dallas Cowboys roof collapse)

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Bottom line is the work is to be done either by or under the direct supervision of the engineer of record. It is up to the engineer of record to take responsibility for the design in whatever method they feel is adequate and then stand behind that design. However they justify their design is their business. This can lead to standard of care issues which varies from one area of the country to the other.
Dave Puskas, PE, SECB
(Senior Engineer, Structural)
Cyntergy aec
320 South Boston 12th Floor
Tulsa, Oklahoma  74103
918-877-6000 ext. 394

From: Tom Skaggs [mailto:tom.skaggs(--nospam--at)]
Sent: Monday, June 29, 2009 3:27 PM
To: seaint(--nospam--at)
Subject: Design Charts (was RE: Dallas Cowboys roof collapse)

Please clarify this statement?  Do you run span tables for TJIs?  Do you use Simpson catalog for LTP4s?  Do you use AISC Steel manual charts for unbraced wide flanges?


I understand where you are coming from, but being an organization that provides “span charts” for glulams, panels et cetera, it would strike me that SOME use of charts and tables greatly increase your productivity.  I’m also a firm believer in “trust but verify”, but I’d certainly not claim to know more about hanger design than Simpson Strong-Tie.





Thomas D. Skaggs, Ph.D., P.E.

Manager, Product Evaluation


7011 S. 19th Street

Tacoma, WA 98466

253-620-7479 (office)

253-620-7235 (fax)





From: Gil Brock [mailto:gil(--nospam--at)]
Sent: Monday, June 29, 2009 11:22
To: seaint(--nospam--at)
Subject: RE: Dallas Cowboys roof collapse


I cannot believe that an engineer being paid to "design" a building or a component of a building will not do his/her own calculations to justify the design of these types of elements, rather than picking a number from a table!.


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