Sign up for the Dlubal Extranet to get most of the software and have exclusive access to your personal data.

Create Account

90-Day Free Trial

Back to Formulas

12x

001515

2024-08-26

Spring Constants – Semi-Rigid Column Head, Elastic Surface Foundation, Neglecting Shear Stiffness

Using these formulas, you can calculate the spring constants for the stiffnesses using a fictitious column for a semi-rigid support and an elastic surface foundation without considering the shear stiffness.

C_{u X} = \frac{3 \cdot E I_{z}}{h^{3} \cdot A_{head}} + \frac{X}{100} \cdot \frac{9 \cdot E I_{z}}{A_{head} \cdot h^{3}}

C_{u Y} = \frac{3 \cdot E I_{y}}{h^{3} \cdot A_{head}} + \frac{X}{100} \cdot \frac{9 \cdot E I_{y}}{A_{head} \cdot h^{3}}

C_{u Z} = \frac{E A}{h \cdot A_{head}}

C_{φ Y} = 2 \cdot \frac{E I_{z}}{A_{head} \cdot h} + \frac{X}{100} \cdot \frac{E I_{z}}{A_{head} \cdot h}

C_{φ X} = 2 \cdot \frac{E I_{y}}{A_{head} \cdot h} + \frac{X}{100} \cdot \frac{E I_{y}}{A_{head} \cdot h}

;