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How to design Hoardings / advertisment boards
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kappi
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PostPosted: Mon Jul 21, 2014 9:09 am    Post subject: Reply with quote

Dear Er. Jayakumar,

The arrangement of embedded ISMB will definitely adds some stability,

Please make sure structure is checked for oblique wind and dynamic loads.

Also requesting Sefians to help in finding out Links/ Litreatures for Dynamic wind load calculations for Large Hoardings at Heights above 30m.

Thanking you,

Kapil Chawla


Last edited by kappi on Mon Jul 21, 2014 12:13 pm; edited 2 times in total
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es_jayakumar
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Joined: 24 Nov 2011
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Location: Cochin

PostPosted: Mon Jul 21, 2014 11:53 am    Post subject: Reply with quote

Dear Sefians,


Please get me some feedback on the arrangement of the proposed hoarding structure on safety point of view.

E S Jayakumar
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es_jayakumar
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PostPosted: Tue Aug 05, 2014 1:37 am    Post subject: Reply with quote

Dear Sefians,

I have observed commercial hoardings mounted on roof tops of ordinary buildings (even load bearing) in such a way that their legs are often supported on slab top ( not even over beams), with a concrete pedestal of 500mm to 600mm dia. Will this be safe for distributing 1.0 to 2.0 MT of of load from leg to the slab ? Any way, no failure of such structures is seen reported !

E S Jayakumar
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N. Prabhakar
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PostPosted: Tue Aug 05, 2014 1:16 pm    Post subject: Reply with quote

Dear Er. Jayakumar,

You have raised a valid point whether the top slab of the building on which the hoarding is mounted, can take the additional upward/downward force of 1 to 2 MT from the hoarding.  Mostly, it may not take this additional force.   Normally, the hoardings are designed by structural engineers (mostly half-baked as hoardings are not considered seriously as a structure) appointed by hoarding contractors.  As professional ethics demand, the structural engineer of the hoardings should contact the original structural designer of the building and get structural details of the floor to check its structural adequacy to resist the additional forces, or take a considered opinion of the original structural designer about it as he is the right person to evaluate the structural adequacy for this additional load from the hoardings.  This is never done in practice as far as I know.  Structural failures do occur, but it is not reported as in many other cases.

As I mentioned earlier in my previous posting on this subject, these additional forces from the hoardings do disturb the water-proofing treatment provided on the roof slab and thus cause a serious and perpetual leakage problem in the storey below the top roof.  Again, such leakages are not reported.

With best wishes,

N. Prabhakar
Chartered Structural Engineer
Vasai (E)
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es_jayakumar
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PostPosted: Wed Oct 22, 2014 11:51 pm    Post subject: Reply with quote

Dear Sefians,

A hoarding structure is not subjected to any LL. Hence, while designing it by LSD method, what are the load combinations to be taken into consideration ?
Is just 1.5DL+1.5WL sufficient ?

Regards,
E S Jayakumar
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PostPosted: Sun May 31, 2015 6:14 am    Post subject: Reply with quote

Dear SEFIans,


I hope, the RCC combined footing of a steel frame hoarding structure has to be designed mainly for the overturning moments due to wind load.  (similar to the design of a retaining wall). Can you please throw some light on it ?

Regards,
E S Jayakumar
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es_jayakumar
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PostPosted: Sun Jun 28, 2015 3:26 am    Post subject: Reply with quote

Dear Sefians,

If we provide only the flex sheet without GI sheet backing for a steel hoarding structure, I hope, we can relax the design wind forces, as the flex sheet will tear off much before the design wind speed occurs.
Kindly throw some light on it.

Regards,
E S Jayakumar
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