Dear Sir,
While analyzing a combined system of FRP and Steel, the Code stress calculated for steel in expansion case does not match with the design code specified. Following are the data’s of the problem faced.
Design Code - FRP: ISO 14692, Steel: B31.3 (it is a buried system)
P1: 1900 KPa, P2:2850 KPa, T1: 66 C
Steel part alone:- Material : API 5LB , Sc : 137895.141 KPa, Sh: 137895.141 KPa
At a specified node (especially the node at which steel fails in expansion case) the stress values are as follows
Axial Stress : -78856.0 KPa , Bending Stress : 194561.1 KPa, Torsion Stress: -0.0 KPa, Hoop Stress:0.0Kpa
Code Stress displayed by Caesar is 273417.1 KPa and Allowable Stress displayed by Caesar is 206842.7 KPa
With design code as B31.3 , the allowable stress matches with the formula of f(1.25Sc + 0.25Sh)=206842.7 KPa, whereas the code stress does not match with the formula for expansion case of Sqrt(Sb^2 + 4St^2) = 194561.1KPa. The system should pass in the expansion condition.
The Caesar displayed Code Stress value is seems like the value calculated using ISO code (sum of all stress : 78856.0+194561.1 = 273417.1). Hence the system fails
Don’t know whether the value displayed by Caesar is wrong or my understanding is wrong.
Kindly correct me.

Regards,
Kparthy

Open a Support Request on SmartSupport and send in your model file.

Dear Richard,
My boss is on leave today. I will send the model file after consulting with him on tomorrow

Regards,
Kparthy