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Blast Resistant Building

 
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Ashwani Saxena
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Joined: 22 Aug 2020
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PostPosted: Fri Jun 25, 2021 2:21 pm    Post subject: Blast Resistant Building Reply with quote

Dear All,

Please enlighten me about design requirement of Blast resistant building, I need to design G+1 building in LNG plant (Marine Area) for blast over pressure as 0.2bar with +ve phase duration 1.50 sec. For that do we go for dynamic approach (time history) or static approach in design is needed.

Is there any guideline is available.

Thanking You.

Regards,
Ashwani Saxena
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vikram.jeet
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PostPosted: Sat Jun 26, 2021 4:21 am    Post subject: Reply with quote

Dear Er

Pl refer BIS CODE IS 4991 ON BLAST RESISTANT DESIGN OF STRUCTURES FOR EXPLOSION ABOVE GROUND.

All design criteria and guidelines are given in this Code.

Beat wishes
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glnp12
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PostPosted: Mon Jun 28, 2021 10:55 am    Post subject: Re: Blast Resistant Building Reply with quote

Ashwani Saxena wrote:
Dear All,

Please enlighten me about design requirement of Blast resistant building, I need to design G+1 building in LNG plant (Marine Area) for blast over pressure as 0.2bar with +ve phase duration 1.50 sec. For that do we go for dynamic approach (time history) or static approach in design is needed.

Is there any guideline is available.

Thanking You.

Regards,
Ashwani Saxena

-----------------------------
IS 4991 gives pressure calculations. But the method is quite old. Once the pressure of 0.2bar is estimated, one can use 'transient dynamic' analysis (either, linear or non-linear) for time based response. Concrete structures are quite stiff and can tolerate good amount of pressure within small time (pulse load). If the strains / forces are beyond linear range, from the above analysis, use cracked moment of inertia, and non-linear properties for steel (say, elastic-plastic or elastic-strain-hardening model) for checking collapse mechanism. Brick walls may collapse under pressure waves, due to poor bonding between bricks and columns / beams. This is the only critical aspect. For RCC shear-wall structures, this issue can be handled easily.
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vikram.jeet
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PostPosted: Mon Jun 28, 2021 11:48 am    Post subject: Reply with quote

Blast resistant wall

I think brick walls with sandwiched RCC wall can also help and shuttering cost is not there , and a thick wall section  of about 230 (bk wall outside). + 200 ( sandwiched RCC). + 115 ( bk wall inside)  = 545 mm thick wall , will able to take blast load. Both inside and outside bk  walls masonry shall also be reinforced after every 4 to 5 courses with light reinforcement. Anchor reinforcement bars of about 550 mm ( the composite  wall thickness ) shall also be provided at regular intervals to have bond between bk and sandwiched RCC .
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suraj
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PostPosted: Tue Jun 29, 2021 11:05 am    Post subject: Field Engineering Building+General+Blast Reply with quote

Please Refer to posting dated 29.03.2010
https://www.sefindia.org/forum/viewtopic.php?t=7277
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spshaha
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PostPosted: Wed Jun 30, 2021 4:30 am    Post subject: Blast Resistant Building Reply with quote

dear sir pl find doc for blast design specification
sp shaha

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pvgraju
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PostPosted: Thu Jul 01, 2021 8:20 am    Post subject: Blast Resistant Building Reply with quote

Dear Sir,

Loading depends upon positive phase plotted against time vs pressure diagram.
if positive phase is smaller than natural period effect of explosion vanishes.
when positive phase is longer than natural period static load.
when positive phase and natural period are in near agreement then dynamic loading.

Regards,

P.V.Gavarraju.
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