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Crane Runway Bracing Vibration[Subject Prev][Subject Next][Thread Prev][Thread Next]
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- Subject: Crane Runway Bracing Vibration
- From: "Gary L. Hodgson and Assoc." <design(--nospam--at)hodgsoneng.ca>
- Date: Fri, 06 Jun 2014 07:46:46 -0400
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Fellow listers,I have a problem that I have never run into before. I designed a free standing crane rwy for a 30 ton EOT crane. The column centres are approx 28.5 ft, with only 5 bays and the columns are braced about the weak axis by X-bracing in one bay (at centre of rwy, both sides) consisting of L6x4x5/16 with the long leg horizontal, connected by a bolt where the 2 angles cross. When the crane starts up and starts travelling down-aisle, the bracing vibrates to the annoyance of the customer and his workers. The vibration is out of the plane of the X-bracing. This does not happen if the crane starts elsewhere, and just passes over the braced bay. First, I had the existing bracing pulled tighter - did'n't work. Next, I added reinforcing angles i.e, boxed the angles but that did not solve the problem. My next attempt will be to add a horiz strut between the columns and then connect that to the X-bracing with a short length of angle to the centre of the X-bracing so it will prevent or decrease the amount of out-of -plane motion.
Can any of the members suggest another solution? Gary -------------------------------------------------------------------------Post your message to the list by sending it to: SEAINT-SEAOSC(--nospam--at)mail-list.com.
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