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RE: Sliding - Friction & passive resistance

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The friction and passive pressures can be combined as per code realizing
that the code gives you a bare mimimun values.  However, I have seen
reports requiring a reduction factor when the two are combined especially
if the values are somewhat more liberal.  A 2/3 factor is used when
combined effects are utilized.  Just my observation
Samir Ghosn, PE
Harris & Associates
At 10:30 PM 11/14/2002 -0000, you wrote:
>        said the code was  rational. 
> -----Original Message-----
>From: C  Chan [mailto:seaint_list(--nospam--at)]
>Sent: Thursday, November 14, 2002  8:10 AM
>To: seaint(--nospam--at)
>Subject:& passive resistance
>>    is it rational to combine frictional resistance    (i.e. W x static
>>friction coefficient - assuming granular soil, not cohesive    soil) and
>>passive resistance together to resist seismic forces for a critical   
>>element like shear wall?    What do you think? 
>>    RDAHLMANN(--nospam--at) wrote:    I      have a question about sliding in
>>long shear walls. In high seismic regions,      sliding can govern
>>footing sizes. Resistance is provided by the friction      factor times
>>the dead load weight (times appropriate factors) plus any      passive
>>pressure. This can also include return walls.
>>For long shear      walls, it seems like there should be some sort of
>>side friction factor also      (similar to caisson skin friction). I have
>>not seen this anywhere, but I      would like some input about this
>>Richard      Dahlmann, P.E.
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