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Re: [SEAOC] Factors of Safety: Short-Term Structures

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What about safety factors for short-term loading conditions such as during 
construction or excavation - can safety factors be reduced for conditions 
which may only last a few weeks or months?  For example, if portions of an 
existing structure must resist abnormal loads during rehabilitation, is it 
reasonable to reduce safety factors?  If so, by how much?  What about sliding 
factor of safety for temporary excavation conditions?