Crash Wall
Crash Wall
(OP)
Any one has an experience for designing crash wall (concrete) for railway? What is the reasonable assumption on the deflection of the wall?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: Crash Wall
Is this a runaway locomotive at 250 tons doing 60 mph (great movie!), or an unloaded boxcar or gondola in a switchuard doing 5 mph (not-so-great movie)?
Is the intent of the wall to deflect the energy or totally absorb it? Is the wall to be still serviceable after the impact or be expendable?
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Crash Wall
I've done a concrete block design a while back used for failure analysis (crash testing cars, airplane seats, etc). The client provided the specs that I needed to design the concrete block.
Your wall deflection is tied to how much energy it's supposed to absorb. Maybe your client has a set idea of the amount. With the project that I did, the number was given to me by the client.
RE: Crash Wall
RE: Crash Wall
Your client must tell you what you are stopping/deflecting or you can do nothing.
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Crash Wall
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I don't think deflection is a primary consideration. Strength is.
BA
RE: Crash Wall
ht
Train runs into nuclear container at 100mph. I liked a comment below it:
"Now drive it into scientologists"
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Crash Wall
In any case, a plane is made as light as possible, while a locomotive is intentionally made heavier, so there's not a good comparison between the two.
RE: Crash Wall
I've recently specified a cantilevered car barrier that has been designed to have large deflections, the testing video showed it rotating till it almost hit the ground. The increased deflection reduced the equivalent static load to next to nothing and was still code compliant. Perhaps you could use and specify the deflection of the wall to reduce the load it is resisting. I assume an energy analysis of some sort would be in order wouldn't take much to do the calcs.