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impact strength of concrete

impact strength of concrete

impact strength of concrete

(OP)
dear all,
i work for an oil and gas services company as an engineer, and my collage background was mechanical engineering. but i got an assignment to design a hydrostatic test area at our workshop for testing our equipments. the highest pressure we used to use so far was 15000 psi. the basic design of how the hydrostatic test area would be are described on the image below. i plan to put this concrete bunker below the surface of the ground or in another word, the top of this bunker are at the same level with the ground surface.

http://imageshack.us/photo/my-images/809/hydrotestshop.jpg/

As i have less knowledge of concrete, i would like to ask you what is the concrete thickness should i use. and how to calculate it?

i already have a simple calculations to calculate the force to be taken by concrete wall, but i have no idea about the strength of concrete. is it have some kind of hardness value and yield strength also like metal does.?

here's the calculations i`ve made

assumed that there will be a projectile being shot to the concrete wall because of an explosion of the equipment (worst case scenario)

projectile detail :
diameter: 5cm
mass : 1 kg

concrete wall are placed 1m from the projectile initial position

projectile will be fired by 15000psi pressure = 103421355 Pa
by using formula Pressure = F/A, and calculating the area contact of the projectile we'll got

F= Pressure x (pi) x D^2 /4
and we got force (F) = 52672063582 N

then, with basic formula F= m x a
we'll got acceleration (a) = 52672063582 m/s2

then with distance to the wall = 1 m, the terminal speed of the projectile before impact
are calculated as below

Vt = sqrt(2 x a x Distance)
Vt = 324567.6 m/s

with this, we can calculate the kinetic energy of the projectile would be
KE = 1/2 m V^2
KE = 5.267 E10

i guess this is the energy the concrete block have to suppress.

please correct me if i am wrong, and yes i also neglect that there is air friction effect to the projectile.

so the questions is how should the concrete will be.? how thick it will be also...


thanks before,
and regard


adi cahyanto

RE: impact strength of concrete

You need to get a local structural engineer involved.

RE: impact strength of concrete

And stand far away and learn how to use CAPITAL letters and periods...................

RE: impact strength of concrete

What a crazy idea unless I am not comprehending the OP. I would think that 10' thick of extra reinforced concrete will do that way you can the same bunker over and over until you have no more concrete and then repour fresh concrete over the existing rebar.

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