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Re: Structure Magazine Questions[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Structure Magazine Questions
- From: rlewis(--nospam--at)techteam.org (Richard Lewis)
- Date: 10 Jan 1999 00:28:20 GMT
seaint(--nospam--at)seaint.org,Internet writes: Can the safety factor for overturning of a retaining wall be reduced below 1.5 when analyzed subjected to seismic forces (i.e. 1.5/1.33)? I would say 'NO', it can not. The loads from seismic forces are the maximum probable load for a given return period. They are not precise, and a factor of safety is still required. We design a structure to survive a seismic event, for life safety reasons primarily. Why would we want to reduce the life-safety even further by reducing the factor of safety. It would seem to me to be a foolish move. Allowable stresses are increased because for short term duration a material can be taken to a higher stress before failure. But the laws of physics for overturning do not change for a short-term loading. __________________________________________________ Richard Lewis, P.E. Missionary TECH Team rlewis(--nospam--at)techteam.org The service mission like-minded Christian organizations may turn to for technical assistance and know-how.
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