impact loading

huangyhg

impact loading
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?
check out our whitepaper library.
yes.  the 2.0 multiplyer only accounts for the instantaneous load created when stopping a moving mass.
  
ralph
structures consulting
northeast usa
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.
i am designing a rail bumper stop. the collision is produced at a small speed of 8 ft/ minute.
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.
the stop is rigid. the energy absorber is on the bogey that makes contact with this bumper.