ASCE 7-05 OR 7-10?

[BSVBD]

The state in which we submit projects for approval adheres to IBC 2009.

In IBC 2009, Chapter 16, Page 16-1, under “General Comments” it says, “The earthquake loads, winds loads and snow loads in this chapter are based on the 2005 edition of ASCE 7.”

In 1605.2.1 Basic Load Combinations and 1605.3.2 Alternative Basic Load Combinations, ACSE 7 is mentioned, but, no specific version of it.

Because page 16-1 states those specific loads are "based on the 2005 edition", must i adhere to 2005 or may i use a later version?

I would think we should always conform to the latest version. Is there a reason we should not?

Is it written somewhere that we should use the latest version?

Thank you!

 

[BUGGAR]

States generally adopt building codes by law, so by that by law, you are obligated to do as it says. However most building departments, in my experience, will accept later codes in individual cases. You can request approval under the Code stipulated Alternates.

 

[steellion]

IBC 2009 incorporates ASCE 7-05 by reference. If you're using IBC 2009, use ASCE 7-05. Don't mix and match; that will get you in trouble.

IBC 2012 and 2015 incorporate ASCE 7-10 by reference

 

[JStephen]

I'm thinking there's a Chapter 35 in IBC that lists all the references, and also shows which year of the reference.

 

[JAE]

steellion is correct that you cannot mix and match ASCE 7 versions with the wrong version of the IBC.

JStephen is correct in pointing to the IBC chapter 13 where it designates which versions of the referenced standards you should use.

BUGGAR is correct that you can use later codes, but ONLY if you also meet all of the provisions of the actual adopted code unless you get some special permission from the local authorities.

So my post here is simply all agreement I guess. Have a nice day.

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[msdmoney]

I agree with JAE's summary you always use the reference standard as referenced in the code. I had some long term projects that were still using outdated referenced standards by the time they finished construction. But you wouldn't want to suddenly jump forward in referenced standards, could cause a lot of confusion and problems.

But I've found, like Buggar that most jurisdictions are willing to accept the latest version of a referenced standard. For example I did this a lot with Appendix D back when ACI 318-05 was code using the detailing provisions of ACI 318-08 to eliminate consideration of concrete breakout. You just have to be careful when you do that not to conveniently pick and choose. Sometimes you might leave out important provisions that went along with those code updates, or were just moved.

 

[Guastavino]

Also remember that the 2010 ASCE 7 had a major update for wind. Now the loads are reported as ULTIMATE as opposed to SERVICE. Just like you have to make sure you have compatibility between units, you need to make sure you have compatibility between codes. ASCE 7-10 is laid out for later versions of the IBC

 

[Ron]

As above, see Chapter 35. That is your typical legal requirement, depending on your state.

 

[BSVBD]

Understood!

I see it in Chapter 35.

Thank you all!

 

[tstructural]

I've had two projects recently where the Sds value decreased with the change to ASCE 7-10. So, if your spec (or the local laws) require the older version and you use the newer version you could be 'under designing'.

 

[TehMightyEngineer]

The seismic maps were updated in ASCE 7-10 to reflect the latest seismic data and risk analysis. As tstructural pointed out this caused some small (and sometimes very large) reductions in seismic loads (along with some increases). There's a good map online somewhere that shows the relative increase/decrease of various ares.

Professional and Structural Engineer (ME, NH)
American Concrete Industries

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[BUGGAR]

Yeah, my house seismic went way up because of the Rose Canyon fault.