exception for h in load combinations

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This article discusses about lateral earth pressure in ASCE 7-05 for using load combination and exception.

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Exception for "H" in Load CombinationsPosted on 2014-06-06

Topics: 2012 IBC, ASCE 7-10, Load Combinations

Return to Blog Index

Question: In ASCE 7-05 Section 2.3, Basic Load Combinations, there is an Exception 2, whichstates "Where lateral earth pressure provides resistance to structural actions from other forces, it shallnot be included in H but shall be included in the design resistance."

Would you please clarify the whole statement entirely? Also, what does it mean "it shall not beincluded in H but shall be included in the design resistance?" It would be helpful if you can give anexample too.

Answer: The corresponding provision in ASCE 7-10 has become:

1. where the effect of H adds to the primary variable load effect, include H with a load factor of 1.6;2. where the effect of H resists the primary variable load effect, include H with a load factor of 0.9where the load is permanent or a load factor of 0 for all other conditions.

You may find this new language easier to understand. The ASCE 7-05 requirement could beparaphrased as: "where the effect of H resists the primary variable load effect, include H with a loadfactor of 1.0." ASCE 7-10 has refined that to 0.9 when the soil causing the pressure can be countedupon to be there and 0.0 when it can be eroded.

A good way to think of the requirement is: the load factor on H is 1.6 when it hurts, but the factor is 1.0 (ASCE 7-05) or 0.9 or 0.0, as appropriate (ASCE7-10) when it helps.

Please note that we are offering a web seminar on load combinations where this subject will be addressed as well as others. For more information, visit:http://skghoshassociates.com/seminar-id-174/

Return to Blog Index

Exception for "H" in Load Combinations

4/17/2015http://skghoshassociates.com/SKGAblog/viewpost.php?id=21