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Re: LRFD vs ASD[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: LRFD vs ASD
- From: "Bill Sherman" <SHERMANWC(--nospam--at)cdm.com>
- Date: 28 Jul 98 09:55:12 -0400
>For foundation design, if you recall, Terghazi's equation is at the strength level. We have been taught to design the soil bearing using ASD with "allowable" bearing values commonly given in soils reports. All we need to do is ask the GE for the bearing strength of the soil. < And what phi factors would you use for soil? Soil "allowables" are typically based on much higher factors of safety than steel or concrete. Thus applying standard load factors and using soil ultimate strengths would be rather unconservative without the appropriate phi factors. Also, foundation design is very dependent upon serviceability/ settlement concerns. Would you design your foundation for "ultimate" settlement also?
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