femr2 wrote:You've lost me there. I'll wait for your next segment, no pressure.
Keith Seffen mentions an effective residual capacity P* with a suggested value (early in the paper) of 0.03. So, given an FOS of 5 and determining capacity at a level by summing the loads above, multiply that figure by 0.03 times the distance dropped. I said Seffen-ish because that's not what he did, but the idea of 0.03 over the distance (same as full capacity times 3% of the distance) came from his paper. This enfolds elastic and plastic ranges along with an intrinsic reduction in capacity based on the notion of propagation of failure - in other words, it's a figure pulled out of my ass.
It's the lowest number that seems reasonable without something both-hands-waving-vigorously to make it lower.
The other E1 figure I used was simply 0.03*0.5*P + 0.07*P(y) where P(y) is the peak capacity determined as above, FOS*sumOfLoad(y). That's supposed to represent a linear elastic phase with max of P plus a constant plastic phase at P. The total displacement of 10% of story height for structural resistance is, to my vague lay understanding, quite generous under the circumstance. Naturally, the energy sink difference compared with your run to get arrest at 51 is proportionally less than the first method.
Taken together with inelastic collision losses, I didn't bother adding any more sinks - not that they don't exist or whatever, but more to keep it simple for a baseline of comparison to get a gross sense of the power dissipated by your model as a multiple of structural resistance. Notice I didn't say energy this time.
I could hang-out in the central core....YEP !
Haha, OK, you get the job! Can you imagine Bazant hogtied in a nearby building with a stick of dynamite in his mouth, dependent on the crush front to destroy a radio-timer-detonator on the first floor way below you - within 20 seconds of initiation? Survivor gets big monetary reward. Now that's a game show!
(Hey, just kidding, I'm really not that bloodthirsty - but some TV execs are so I kinda regret putting that out into the aethers, but not enough to erase it. Moderator, Moderator, come save me from my own tasteless bend)
