Can the concept of noting DEFLECTION of, say, the middle point of the crane structure under variable loads say up to 2 tons(that is available with us) be used for depicting the deflection at 6.25 tons. Is it practically/ professionally reliable?
Generally testing of crane should be done at rated load & at 125% load or 1.5 times the rated load-- depends on the standard of testing. Plumb test at center of the girder must be checked for rated load only which is an important clearance for crane. The deflection from plumb test must be noted and comparison with standard as to be done for clearing the safety of the crane and girder.
In your case you can try concrete blocks/slabs piled in a big tray with wire rope slings in the site, measure the weight and then proceed. Testing deflection at low loads does not guarantee the safety of the crane and hence not practical. while testing you have to proceed gradually in increasing the weight. at 2 tons you can check the deflection and then you have to lift the material at 6.5 tons exactly at the middle of the girder.
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