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Civil Engineering/reinforced concrete


QUESTION: What is the boundary conditions needed for a rectangular section in water tank ?
since entering this section in ETABS for an example needs the boundary conditions to give results or an error will occur.

ANSWER: Dear Mahmoud

If you mean boundary condition in foundation level, you can suppose a simple hinge support in each node of rectangular plates.

Is is ok?


---------- FOLLOW-UP ----------

QUESTION: I mean in the water tank above if i take a section which will be a rectangular section having the water pressure as a load whats the boundary conditions fo this section ???

Dear Mahmoud

You will have a ring axial stress ( for circular tanks)[ for non circular flat plate tanks we will have moment]  + Shear stress ( parallel to hydrostatic loading) [ this shear is not distributed uniformly] + Axial stress along the height of the tank.

Actually you will have moment + shear which is decomposed to axial load and shear along the thickness of the tank. If the thickness is small enough the moment effect will change to a pure axial effect with no shear.


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Babak Esmailzadeh Hakimi


I can answer questions in Structural Engineering, Earthquake Engineering, Project Management and Project Control topics!


I am experienced in the area of earthquake engineering in electrical power industry, i.e. Lifeline Earthquake Engineering. My focus has been on structural seismic design of power installations. Recently I have got involved in project management in the category of constructional engineering.

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Bs degree in Civil Engineering from Ferdowsi University ,1988, Mashhad Iran, Ms degree in Earthquake Engineering, Sharif University of Technology, 1993, Tehran, Iran

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