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rane load

 
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JMSSNL at ltecd.ltindi...
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PostPosted: Tue Oct 14, 2003 10:00 am    Post subject: rane load Reply with quote

Dear Sir,

Present Steel design code IS:800:1984 is having guidelines for crane
load combinations (Article 3.4.2.4).  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 6.4.3.2 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.

Thanks,


Jignesh
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