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| Q. |
The maximum wheel load is obtained when |
| A. | crane crab is farthest to gantry girder |
| B. | crane crab is closest to gantry girder |
| C. | crane crab is not attached |
| D. | crane crab is at mid span |
| Answer» B. crane crab is closest to gantry girder | |
| Explanation: the maximum wheel load is obtained when crane crab is closest to gantry girder. the crab in such position on the crane girder gives maximum reaction on the gantry girder. the vertical reaction of crane girder is transferred through its two wheels on to the gantry girder. therefore, the maximum wheel load is half of this reaction. this maximum wheel load is then increased for impact and used for design of gantry girder. | |
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