Effective flange width composite bridge

SOFiSTiK SOFiPLUS
1

Hi!

I have create a composite bridge (steel+concrete). I have followed the tutorial from 2022 on your website.

This tutorial do not talk about effective flange width, see EN 1994-1-1 or EN 1994-2.

I found a old question about this and it says that it need to be set manually for the T-beams cross-section, according to EN 1994.

Is this still relevant in Sofistik FEA 2022? If I change the cross-section in support areas I don’t get enough self-weight from concrete (and formwork?) if I follow the tutorial. I think that the formwork will be to low also in the support areas.

How do I get the linear transition for the effective flange width between span areas and support areas illustrated in EN 1994?

Best regards Andreas

2

Hello Andreas

The effective flange width can be considered with a NEFF (non-effective area). This function was not considered in the tutorial because the span between the columns is quite large and the non-effective width is therefore negligibly small. For this reason, we didn’t want to overcomplicate the example.

The following tutorial explains the definition of a non-effective area.

You could also look at the TEDDY example below.

TEDDY > File > Examples > aqb > english > aqb1_6_composit_neff.dat

Best regards
Frederik Höller
Your SOFiSTiK Support Team