bridge convergency issue

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mlaur96
Posts: 3
Joined: Fri Oct 06, 2023 3:07 pm

bridge convergency issue

Post by mlaur96 » Fri Oct 06, 2023 3:47 pm

Dear community,

We have to perform a pushover analysis of a bridge with a simple deck.

We are modeling the columns using rectangular fiber sections, while the deck is a shell element with RCSection2D. Consider that the chosen units are N and mm. Self-weight has been added as 'eleLoad' in the columns and as a Face Force in the shell.

We have tried to run a first analysis with vertical loads, but not reaching the convergency, but we are not being able to identify the mistake. Could you please give your opinion? (file attached).

Thanks!
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BridgeModel_v1.zip
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STKO Team
Posts: 3066
Joined: Tue Oct 29, 2019 8:45 am

Re: bridge convergency issue

Post by STKO Team » Mon Oct 09, 2023 9:49 am

The RCSection2D is for beam element in 2D analysis, not for shells.
For shells you need:
  • A 3D material for concrete (for example ASDConcrete3D)
  • A uniaxial material for steel
  • Convert the uniaxial material into shell reinforcement
  • Use a layered shell section to combine the above
Follow this webinar we made for shear walls (webinar 32):
https://asdea.eu/software/advanced-e-learning-courses/
ASDConcrete3D: A new 3D constitutive model for concrete and masonry like materials
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