In a steel frame structure I am modeling,
For one row of beams allowable slenderness is 400 (fx = -0.005 kN)
For similar second row of beams allowable slenderness is 180 (fx = 0.005 kN) and it is failing.
This minuscule compressive load is making the beam fail. So I am planning to ignore such small values.
My query is there any limit of force values we can ignore?Is there any automatic way jn stand to ignore such small values?
Regards
You will not be able to ignore force values but can alter the slenderness check criteria.
You can use MAIN and TMAIN parameter with limiting values to direct program to check slenderness against that limit.
For example here if you use MAIN 400 for the failed section then it will be passed as it will be checked against a higher limit of 400 compared to default value of 180 or 200 depending on code.
You can bypass the slenderness check also using 1 or -1 value depending on code.
Refer below links for more details.
https://communities.bentley.com/products/ram-staad/f/ram-staad-forum/174000/slenderness-failure
https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/29075/steel-design-output-indicates-a-slenderness-failure
Hope this helps!
Thanks for the reply.
I am aware of Main and Tmain parameters.
My query is do i have to check each failed member for the extent of compressive force developing in them?
Is there any way Staad could ignore such small values automatically?
No, there is no way to bypass the force values.