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Posted: Tue Oct 14, 2003 10:00 am Post subject: rane load
Present Steel design code IS:800:1984 is having guidelines for crane load combinations (Article 22.214.171.124). Requirement of this provision was necessary in year 1984 since at that time prevailing loading standard IS:875:1964 did not have similar provisions. In subsequent revision IS:875 part 2 -1987 cl.6.4 introduced similar provisions with little more elaboration.
Hence, IS:800 provisions have become superfluous and shall be removed from subsequent revisions. To my surprise I find that IS:800 draft code has retained original provisions.
A close look at both brings out small difference between two
Footnote below article 126.96.36.199 of IS:875 states "Lateral surge force .....However, if there is only one crane in the bay, the lateral and longitudinal forces may act together simultaneously with vertical loads"
On the other hand in Draft version of IS:800 article 3.5.4 talks about lateral and longitudinal loads not to act simultaneously and has no such rider for one crane in the bay situation.
In my opinion , crane load combination shall be left for IS:875 to decide and shall be removed from IS:800 which essential is for steel structure design. Also any future revision in IS:875 may create further anomalies between two provisions.
I would appreciate learned SEFI forum members to provide their views.
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