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Impact Loading

Impact Loading

Impact Loading

(OP)
Folks,
Should a 1.6 multiplier for live load be used in conjunction with the 2.0 multiplier for impact loading resulting in a 3.2 multiplier on the service load?

RE: Impact Loading


Yes.  The 2.0 multiplyer only accounts for the instantaneous load created when stopping a moving mass.
 

Ralph
Structures Consulting
Northeast USA

RE: Impact Loading

Slickdeals,

You don't give any context for your question, but be aware that the 2.0 factor is usually used  to allow for the effect of SUDDENLY APPLIED loads, as opposed to IMPACT loads.

RE: Impact Loading

(OP)
I am designing a rail bumper stop. The collision is produced at a small speed of 8 ft/ minute.

RE: Impact Loading

I usually design these per energy equations like ship fenders.  Is this a rigid stop or is there an energy-absorbing damper on it?

A suddenly applied load is likely much less than a load stopped "instantaneously" from 8 fps.  Unless the stop crumples, than the load will be less.  But your stop will be destroyed.

Bob G.

RE: Impact Loading

(OP)
The stop is rigid. The energy absorber is on the bogey that makes contact with this bumper.

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