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IS 875 Crane transverse loading- Clarification

 
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M V S Sudheer
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Joined: 11 Apr 2010
Posts: 2

PostPosted: Thu Jul 28, 2011 12:39 pm    Post subject: IS 875 Crane transverse loading- Clarification Reply with quote

Dear Sefians,

For lateral surge analysis of industrial frames supporting crane girders, IS 875 (part 2) recommends to apply 10% of (weight of trolley+weight lifted by crane) as horizontal force acting only on side of the frame at a time in either direction (Refer cl. 6.3c, pg.16).

How can this load case practically exist, since when a crane surges laterally it transfers horizontal force to both the rail tracks it is rested on and the force is subsequently transferred to both sides of the frame.

Please clarify.


Regards,
M V S Sudheer
Engineer/Fy. Civil Engg.
BHEL Hyderabad
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Dr. N. Subramanian
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Joined: 21 Feb 2008
Posts: 5335
Location: Gaithersburg, MD, U.S.A.

PostPosted: Fri Jul 29, 2011 3:09 pm    Post subject: Re: IS 875 Crane transverse loading- Clarification Reply with quote

Dear Er Sudheer,

Due to sudden deceleration (due to applying breaks) or acceleration of trolley, a lateral load will be applied on the support. This kind of behavior you might have noticed in cars also - when someone is going fast and applies the breaks suddenly, the car will vibrate in the in two directions and sometimes even topple!

Best wishes
NS

M V S Sudheer wrote:
Dear Sefians,

For lateral surge analysis of industrial frames supporting crane girders, IS 875 (part 2) recommends to apply 10% of (weight of trolley+weight lifted by crane) as horizontal force acting only on side of the frame at a time in either direction (Refer cl. 6.3c, pg.16).

How can this load case practically exist, since when a crane surges laterally it transfers horizontal force to both the rail tracks it is rested on and the force is subsequently transferred to both sides of the frame.

Please clarify.


Regards,
M V S Sudheer
Engineer/Fy. Civil Engg.
BHEL Hyderabad
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M V S Sudheer
SEFI Member
SEFI Member


Joined: 11 Apr 2010
Posts: 2

PostPosted: Fri Jul 29, 2011 6:45 pm    Post subject: Reply with quote

Dear Mani sir,

Thanks for the prompt reply.

I understand that when a crane accelerates/deccelerates a horizontal force is applied on the column due to inertia. Doesn't this horizontal force act on both the columns of the frame simultaneously. On the contrary, IS 875-part2 (cl.6.3c) suggests to apply this horzontal force on one column of the frame at a time. What could be the reason behind this.

Please see the figure in the picture attached.


Regards,
M V S Sudheer
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