Example Using Circular References to Force Iteration: Calculation Effective Section Modulus for Coldformed C-Section to AS4600
Description
Calculation of effective section modulus (Zex) using effective width methods of AS4600, for a coldformed c-section. The workbook is dependent on: schTechLib It uses circular references to force iteration on the calculation of the section centroid. The web has a stress gradient and so the portion which is in compression and not effective is unknown. Has chunks are removed to determine effective width of plates, the section modulus of the c-section changes and so does the location of the neutral axis, and so the portion of the web in compression is different than initially assumed. The circular references force iteration until the difference between the initial assumption and the calculated value is insiginificant.
Calculation Reference
Cold Form Sections
Structural Analysis
Section Properties
Calculation Preview
Submitted By:
Submitted On:
29 Aug 2010
File Size:
79.00 Kb
Downloads:
72
File Version:
1.0
This download is for Registered Users Only.
Perhaps you need to login or register.
For anything other than C-sections, I use CFS software (which does not fully support AS4600, I use becasue AISI:1996 and AS4600:1996 were aligned).
http://www.rsgsoftware.com/products.html
I would like to calculate warping constants and effective section properties for other sections. But not presently sure how to make my c-section routines entirely general. Also I tried working through the Duragal manual and had problems setting up iteration in a spreadsheet and could not get it to converge for a coldformed Angle.
So any feedback to help develop more general thinwalled , and coldformed section property calculator would be helpful.