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Re: Concrete Spring Constant for Base Plate Modeling

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How can I assume "the extension"?  For spring, k=EA/L I know E and I know A and I know concrete compressive strain (0.003).  The problem is L or deltaL.  How can I assume those?  Will L be full length or depth of member? How much will I assume delta L for it?

Thank you so much.


On Fri, Jan 30, 2009 at 9:31 AM, David Fisher <dfisher(--nospam--at)> wrote:

Try my favorite formula, the foundation for structural engineering:


Hooke's Law:


"as the extension, so the force…"





David L. Fisher SE PE


Fisher and Partners - Cayman

372 West Ontario Chicago 60610

75 Fort Street Georgetown Grand Cayman BWI

319 A Street Boston 02210



312.573.1726 facsimile

312.622.0409 mobile


From: john yang [mailto:jeongidea(--nospam--at)]
Sent: Friday, January 30, 2009 11:29 AM
To: seaint(--nospam--at)
Subject: Concrete Spring Constant for Base Plate Modeling


I am modeling base plate on the 6000 psi concrete column and I want to put concrete compression only spring to represent concrete.  The problem is what is the compressive spring constant of concrete.  Could you help me to get it?

Thank you so much.