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Re: Crane Runway Earthquake Loads - Urgent ![Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: Re: Crane Runway Earthquake Loads - Urgent !
- From: Christopher Wright <chrisw(--nospam--at)skypoint.com>
- Date: Wed, 10 Nov 99 09:50:43 -0600
>In order to design a Crane Runway I need to include the Earthquake load >among other loads. > >Particulary, I need to know how much of the lateral force I must consider >in one side ( 50 % or 100 % ). I suppose it depend on the vertical >aceleration and the wheel system. You might want to check the list archives--this topic was discussed last March. Usually the crane is less than 10% of the building mass so all you really need is some notion of accelerations to expect at the level where the crane is mounted. Ground acceleration is not much good. Ideally you should have a floor response spectrum. I feel pretty strongly that you should assess the crane dynamically--it doesn't respond much like a building so the pseudo-static method won't be right. There's pretty good evidence that it's not only not right, it's unconservative. A response spectrum analysis will also give you accurate loads for the supporting structure. You'll also want to be careful that you've considered the possibility of uplift and sliding. Typically wheel loads are carried by one rail or the other, not both, because the wheel flanges only engage the rail on one side at a time. And be certain you address uplift to keep the machine on the rails. Christopher Wright P.E. |"They couldn't hit an elephant from chrisw(--nospam--at)skypoint.com | this distance" (last words of Gen. ___________________________| John Sedgwick, Spotsylvania 1864) http://www.skypoint.com/~chrisw
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