Hi all,

I need to include allowable stress at the analysis for FRP pipes.

What I have to do? Where can I find the required data for Allowable Auxiliary Spreadsheet?

Thanks

Bye

Hi kcole

You need to ask for FRP property from vendor & fill those data to FRP properties in Caesar configuration setup. You can follow either UKOOA, BS 7159 or ISO 14692 as code as per your project specification.

Regards

Habib

The allowable stress can't be entered through the FRP propertiesin CII configuration nor in the frp files.
Make sure you get the correct data from the vendor and apply it correctly in CII. Especially for ISO14692 the allowables provided by the manufacturer often has one or more safety factors (f1 to f4) already incorporated into the allowable. If you enter the manufacturers allowable in CII the safety factor will be applied twice.

Hi, thanks

I have already configurated FRP properties in CaesarII.

I have information from vendor, as follow:

Bi-axial: Ultimate hoop stress at weeping
Circumferential:
Hoop tensile strength
Hoop tensile modulus
Poisson's ratio axial/hoop
Longitudinal:
Axial tensile strength
Axial tensile modulus
Poisson's ratio hoop/axial
Axial bending strength
Beam:
Apparent elastic modulus
Hydrostatic Design Basis:
Static
Cyclic

I need anymore or is it enough?

In example with BS7159:
SH=ed*Elamx
Kn=cyclic reduction factor
K=temperature differential multiplier
"ed", "Kn" and "K" are values from vendor or from code?

Excuse me, if my questions maybe are very basic, but is my first time with FRP.

Regards

Thanks

bye

If you have the Hydrostatic Design Basis value according ASTM D2992 I wouldn't use BS7159. Best to use ISO14692 or UKOOA which can work directly with this value.
The cyclic reduction factor and temperature difference multiplier are values from the code.

Be careful with the poisson's ratio you get from the vendor and the poissons ratio * Eh/Ea value you have to enter in CII. Some manufacturers publish the actual poissons ratio, some publish the poissons ratio * Eh/Ea.

hi, thanks

how you work directly with Hydrostatic Design Basis in UKOOA? (HDB static?)

for UKOOA, I need:

SH= hoop design strees= f1*LTHS
R= ratio r(Sa(0:1)/Sa(2:1))
f2= system factor of safety

Where I find these values?

Regards

thanks

bye

You can check Coades "Seminar Job: CoolH2O" seminar example to learn how exactly you can deal with FRP input in CII for both BS7159 and UKOOA. I don't know if this document is available online or if it is allowed to share it online.

Hi
David Diehl thanks