Selection of IPs and number of fibers in section

[Rana]

In FB model, generally one element per member is OK. But I have some confusion on the following aspects. Please explain:

1. What may be the basis of selection of appropriate number of IPs over the members?

2. How many fibers one should consider for a section. Do you believe that a stable moment-curvature response is expected by gradually increasing the number of fibers. Or, increasing number of fiber beyond a limit may lead to non-convergence. Do we relate this number of fiber with the peak stress-strain values of the section (say for concrete 25 MPa and 0.26% around)? This is just because the fiber area reduces with increasing number of fibers.

Thanks and regards
Awaiting

[z.gronti]

Dear Rana,

You may find relative information in the Element Classes section of SeismoStruct's User Manual and Help System.