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Forums» International Building and Residential Codes -- Structural Issues» load combination for concrete and earthquake (ACI or ICBO?)

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load combination for concrete and earthquake (ACI or ICBO?)
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Re: load combination for concrete and earthquake (ACI or ICBO?) By  Michael J. Kannel

Posts: 0

11/1/2001 11:18:00 AM

ACI''s load combinations assume E is a service load. However, the loads defined by recent codes are strength-level forces. In effect, a load factor is already built in.

''97 UBC and IBC use E/1.4 or 0.7E for allowable stress design.

''97 UBC 1612.2.1 Exceptions 1 and 2 require the use of ACI load combinations for non-seismic loads, but ASCE-7 load combinations (with 1.0E changed to 1.1E) in 1612.2.1 for seismic loads.

IBC 1605.2.1 Exception 1 states, "For concrete structures where load combinations do not include seismic forces, the factored load combinations of ACI 318 Section 9.2 shall be used."

Seismic forces do not fall under this exception. Thus the ASCE-7 load combinations in IBC 1605.2.1 should be used for seismic forces.

Note that ''97 UBC uses a load factor of 1.1 for concrete and masonry but 1.0 for other material. IBC uses 1.0 for all materials.

[This message has been edited by Michael J. Kannel (edited 11-01-2001).]


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