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BASE PLATE DESIGN

 
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sabarinathan99
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Joined: 28 Feb 2012
Posts: 21
Location: Chennai

PostPosted: Tue Feb 28, 2012 7:32 am    Post subject: BASE PLATE DESIGN Reply with quote

Respecetd  Dr. Subramaniam sir,

How do I design the base plate with biaxial bending moment?
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Dr. N. Subramanian
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Joined: 21 Feb 2008
Posts: 5300
Location: Gaithersburg, MD, U.S.A.

PostPosted: Wed Feb 29, 2012 7:19 pm    Post subject: Re: BASE PLATE DESIGN Reply with quote

Dear Er Sabarinathan,

In reality, there is no straight forward solution to this problem. You may convert the BM in the other direction as an equivalent BM in the major direction and design.

Alternatively - analyze one axis a time, and add results from both directions.

Also see the previous discussion in the forum:
http://www.sefindia.org/forum/viewtopic.php?t=6632

The report on Transmission Poles at http://files.engineering.com/getfile.aspx?folder=f5b02f96-7375-437d-a0cd-07bb4679a3b9&file=transmission_poles.pdf

and also the enclosed paper on hexagonal base plates for circular columns may also be useful

Best wishes
NS
sabarinathan99 wrote:
Respecetd  Dr. Subramaniam sir,

How do I design the base plate with biaxial bending moment?
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sabarinathan99
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Joined: 28 Feb 2012
Posts: 21
Location: Chennai

PostPosted: Thu Mar 01, 2012 4:53 pm    Post subject: BASE PLATE DESIGN Reply with quote

Respected Dr. Subramaniam Sir,
                                              But if we considering wind load at 45 degree there is possibilities of biaxial bending moment in base plate design. Is it correct sir?.  In such cases how can I design?.
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JVCSNL
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Joined: 26 Jan 2003
Posts: 159

PostPosted: Fri Mar 02, 2012 12:38 pm    Post subject: Reply with quote

Dear Member,

Simplified method is explained by Dr. NS.

Else, you have to use the first principle for biaxial case.  Here, assume the NA at various angles and find out the exact angle of NA and position of NA which will satisfy all equilibrium conditions.  

This method will be accurate as it is working on first principle.  But it requires lot of mathematical and requires programming effort.

Regards,

Jignesh V Chokshi
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