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Re: '97 code seismic map[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: Re: '97 code seismic map
- From: "Bill Sherman" <SHERMANWC(--nospam--at)cdm.com>
- Date: 17 Mar 98 18:01:53 -0500
I recently compared the 1997 UBC requirements with the 1994 UBC requirements for a project in Seismic Zone 2B, and also found the lateral coefficient to be much higher in 1997. I did account for the 1.4 ultimate stress vs allowable stress factor (which generally shows up as reduced R-factors) - but the soil classifications are what had the big impact on net load increase. In the 1994 code I could use C=2.75 without regard to soil type. In the 1997 code, soil type must be considered in determining Ca and the value can vary significantly with "soil" type. Actually, it looks like anything less than rock will increase the net lateral coefficient for my case. Thus it would appear that significantly higher lateral seismic forces will apply to many projects under the 1997 code.
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