Comments

• Thanks a lot Victor and Disla! I'll try with symmetry.

  in Concrete block under fire - possible problems with mesh/timestep and convergence Comment by gemada May 2023
• Thanks a lot for the reply Victor. As always support is great here! - Density of air is set wrong (it should be 1); Thanks - I´ve seen two ways of modelling: witthout and with convection in cavity...I´ll try both ways and I´ll put them here in the …

  in Concrete block under fire - possible problems with mesh/timestep and convergence Comment by gemada May 2023
• Thanks a lot for your reply Manuel. I'll test your suggestions Meanwhile, I've redone mechanical analisys at 60min for EC2 tabular method, using the already done thermal transient analisys in Mecway. *Change: I've considered the different tempera…

  in Eurocode 2 - fire resistance of concrete structures study case Comment by gemada July 2021
• Update 3: I'll try to re-calculate the resistance bending moment considering the 2 rebars at the corners and the centre rebar at different temperatures...the centre rebar is at a low temperature so strenght will be higher

  in Eurocode 2 - fire resistance of concrete structures study case Comment by gemada July 2021
• Update 2: I've simulated the slab by applying convection and radiation up to 10cm from the top of the beam...that won't change temperature in the bottom rebars but it seems to be more close to a real situation

  in Eurocode 2 - fire resistance of concrete structures study case Comment by gemada July 2021
• Update: in fact beam top face is not adiabatic in my analisys...does anyone know how could I do this? (kind of a top top slab isolation)

  in Eurocode 2 - fire resistance of concrete structures study case Comment by gemada July 2021
• Hi Disla. The unaffected face (top beam and upper face) at room temperature because it is supposed to be inside a slab...I could have exposed the lateral faces considering that (for example, 40cm of lateral face exposed instead of entire eight) but…

  in Eurocode 2 - fire resistance of concrete structures study case Comment by gemada July 2021
• Thanks a lot guys. Manuel I've checked your excel file. If I understood correctly, for REI120 it's allowed bw inferior to 190mm. I'll check the spanish standard cause it may help reduce dimensions. Disla, well observed. So if the isothermals are f…

  in Eurocode 2 - fire resistance of concrete structures study case Comment by gemada July 2021
• Thank you Manuel. I'd like to see your spreadsheet, yes. The problem in my case study is that tabular method from EC2 would be unsafe and that seems really strange to me... P.S.: I'm attaching isothermals from EC2 for a 30x60cm beam and my liml f…

  in Eurocode 2 - fire resistance of concrete structures study case Comment by gemada July 2021
• Hi Manuel and everyone, I've done some changes in Mecway (added self-weight and changed mesh) and considered one more tested beam (experimental). I've attached the mecway files. Results: EXPERIMENTAL four-point bending flexural test: rc beam 1 fail…

  in RC beam nonlinear with Mohr-Coulomb Comment by gemada January 2021
• Hi Manuel, Thanks a loto for your feedback. Your help has been really greatful and useful. I'll try your sugestions for this case and soon I'll post the updated results. Best regards, Jacinto

  in RC beam nonlinear with Mohr-Coulomb Comment by gemada January 2021
• Thanks a lot JohnM. I'll give it a try!

  in Temperature dependent mechanical properties Comment by gemada October 2020
• Hi Mishal. Thanks a lot for your feedback. I understand your point. In my case I'm tryng to use FEM to check some special situations to help me complement experimental analisys, not specifically design...but I must say I'm still a begginer in FEM he…

  in Concrete modelling to predict crushing in compression Comment by gemada October 2020
• Hi. Could we get both?

  in non-linear material specification Comment by gemada October 2020
• Thank you JohnM for your help! The "don't generate" comands are needed or I just need to use "custom model definition"?

  in Temperature dependent mechanical properties Comment by gemada October 2020
• Thank you Victor. I'd prefer total strain!

  in non-linear material specification Comment by gemada October 2020
• Hi Victor. That would be great. I've been away for a while...can you tell when this feature will be available?

  in non-linear material specification Comment by gemada October 2020
• Hi. Thanks for all the replies. Thank you MMartin for your generosity. I've not tested the formula yet, but I intend to. Jalal, I'm also a begginer in concrete modelling...usually for steel I mesh an embedded layer inside concrete (with an equivalen…

  in Concrete modelling to predict crushing in compression Comment by gemada October 2020
• Thanks for your great tips Victor. I'll try to do it but it may take a while because I'm no expert in FEM...yet...hehehe.

  in Concrete modelling to predict crushing in compression Comment by gemada May 2020
• Thanks for the reply! Did you manage to test it in Mecway?

  in Concrete modelling to predict crushing in compression Comment by gemada April 2020
• Thanks a lot once again Victor. I must learn a bit more about mesh convergence. I'll try all your tips.

  in Thermal stress Comment by gemada April 2020
• I'm attaching another example: simply supported beam exposed to ISO 834 fire only at the bottom surface: 1 file with thermal transient analisys for conduction, convection and/or radiation, 1 file with thermal stresses just for heat conduction and 1 …

  in Thermal stress Comment by gemada April 2020
• Thanks a lot Victor. That worked!

  in Thermal stress Comment by gemada April 2020
• Thanks a lot for the replies. Victor, I've checked everything but it doesn't generate thermal stresses. Stoyan, I'm uploading the simple test case (thermal and static files). Thanks a lot.

  in Thermal stress Comment by gemada April 2020
• Thanks a lot for your reply Victor. The hand calculation is based in the formulation of the attached file (for an arrest force of 6kN, an initial sag of 2% of the span lenght and considering the anchorage rigid). I see the modelling will be harder …

  in Horizontal lifeline modelling Comment by gemada October 2017
• Hi Sergio,Sorry for the delay in the reply. Here is the mecway file. I've seen a reply from user jvrajadell  in version 7 beta post. He used 2 nl models for concrete (compression only and another nl model not specified). I've send him a message ask…

  in Compression only material Comment by gemada May 2017
• I work with a 2000 kN machine hehe but with 40 kN one can do a lot. Sergio I was thinking about the compression_only material for calculix. It is defined by two constants: elasticity modulus (compression) and tensile strenght (tension). It's assum…

  in Compression only material Comment by gemada October 2016
• Thanks Sergio. Your simulation are great! I see you are an expert in FEM modeling.I've modeled the rebars with an equivalent area embedded in concrete. All in 3D solid elements (you can check the liml file in the previous replies). I've never used S…

  in Compression only material Comment by gemada October 2016
• Victor, thank you for you reply and link. I've contacted Guido (from calculix) and he also pointed me to that discussion group. I've already started a discussion about modelling concrete non linear. The answers I already got in calculix group: …

  in Compression only material Comment by gemada October 2016
• Just to correct my latest reply: the under reinforced beam has 6.3 mm rebars and not 10 mm.

  in Compression only material Comment by gemada October 2016
More Comments