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Staircase waist slab self weight calculation

 
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sathyace
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Joined: 04 Jun 2011
Posts: 78

PostPosted: Thu Jan 09, 2020 4:17 am    Post subject: Staircase waist slab self weight calculation Reply with quote

Hi all,

Self weight of staircase = 25 X 0.15 X Sqrt(R^2+T^2)/T

25 - Unit weight of RCC(kN/m^2)
0.15 - waist slab thickness(m)

What is the reason we are dividing with T ?

The load acts vertically downwards.The load acting along the inclined slab is the cosine value of (25X0.15)?

Please explain.

Thanks&Regards,
Sathya.
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es_jayakumar
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Joined: 24 Nov 2011
Posts: 1376
Location: Cochin

PostPosted: Thu Jan 09, 2020 10:30 am    Post subject: Reply with quote

Sqrt(R^2+T^2)/T is nothing but 1/Cosθ, (θ being the inclination of the waist slab to the horizontal) which is multiplied to convert the dead load of the waist slab per unit area along the inclination, to load per unit area projected in the horizontal plane.

E S Jayakumar
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sathyace
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Joined: 04 Jun 2011
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PostPosted: Sat Jan 11, 2020 2:19 pm    Post subject: Reply with quote

Thank you sir.
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