Modeling Concrete Coated Pipe

Concrete coating increases pipe bending stiffness. Model this effect by creating a custom material in the material database with an equivalent elastic modulus E_eq. The combined stiffness of steel pipe and concrete coating equals the sum of individual stiffness components:

E_eqI = EI + E_cI_c

where:

E = Steel pipe elastic modulus

I = Steel pipe moment of inertia

E_c = Concrete coating elastic modulus

I_c = Concrete coating moment of inertia

Calculate the equivalent elastic modulus as:

D = Steel pipe outer diameter

t = Steel pipe wall thickness

D_c = Concrete coating outer diameter

Since steel elastic modulus varies with temperature, calculate equivalent modulus values for all required temperatures.

Steel pipe stress results from analysis are accurate and can be verified against applicable codes.

For concrete coating stress verification, use the insulation stress analysis procedure.