EXISTING STRUCTURE DESIGN CHECK

[NANNN]

Hello, is there a chance that RSA overdesigns in some cases? I decided to carry out a design check for an existing structure. The structure has been there for the last 12 years. There are no signs of failure in any way. I have modelled the structure in Robot and almost all members are failing for different load cases. Could someone help me understand why this is the case? I have attached the model below.

[CaioSaporito]

Hi @NANNN ,

For a correct verification you need to apply the buckling coefficients and limit of deformation for each beam/column of the project.

To apply you must go Design > Steel Members Design - Options > Code Parameters

Best Regards,

[Stephane.kapetanovic]

HI @NANNN 

in addition, It is necessary to add the purlins ties, bracings (buckling and torsional). Add the releases, adjust the gamma angle of the purlins in the plane of the roof, turn the posts of the main hall to place the strong inertia in the direction of the frame. If necessary, review the 75kg/m² roof overload (inaccessible or for 1 or two people)

Best regards

[HoshangMustafa]

Hi @NANNN 

You need to use pushover analysis.

[NANNN]

@CaioSaporito Thanks for the response. The buckling coefficients and the limit of deflection was set as per the code used in the design. Would you advice I set my own?

[CaioSaporito]

Hi @NANNN 

Even choosing a code, the user has to input these boundary conditions.

In addition, your model needs many adjustments as described by @Stephane.kapetanovic .

I strongly recommend you to watch the official webinar on steel design.

https://www.youtube.com/watch?v=GhP9An47EKw&list=PLY-ggSrSwbZqow_60fiqJwS69mg1nQMzk&index=3&ab_chann...