Beam Design in Eurocode

[takundat1]

Hi, I'm try to design a beam with stiffeners in Eurocode. When I assign the default beam member type, the ULS design goes on to fail but however interestingly, if I click on the failed member to check the calc note and then select detailed design, the beam passes even without stiffeners (See pictures). As a result, I have two questions:

1) What is the function of detailed design and how is it different from conventional design?

2) How can I design a beam that has stiffeners in Eurocode.

Please find attached the link to the model and also some pictures.

https://1drv.ms/u/s!AlmLGaDE55k7mS0vUgTP6-ssAWa8?e=2I9Usw

[Simau]

@takundat1 

2) How can I design a beam that has stiffeners in Eurocode.

First, to avoid type 2 instability change roller configuration

Please look at screenshots below to configure beam type (buckling lengths and stiffeners)