I think when you were defining the tie between surfaces, you chose Magneta for the edge of the surface, but I assume that Magneta arrowhead is the inner side. I am a little confused about this. would you please explain it a little?
In predefined Field 21:21 Vertical coordinator will be= -60 you take -1 And the stress magnitude 2 = -1750*9.81*60 But you take = - 1750*9.81*1 Can you explain why you take 1 ?
Hi, thank you for your video. I am modeling a similar geometry, but I receive a warning that says: for 32 beam elements either the average curvature about the local 1-direction differs by more than 0.1 degrees per unit length as compared to the default curvature or the approximate integrated curvature for the entire beam differs by more than 5 degrees as compared to the approximate integrated default curvature. this may be due to a user-specified normal or due to the nodal averaging routine used by Abaqus. this difference may cause unexpected behavior of the beam and you may want to verify that the beam normals are correct for your problem. the elements have been identified in element set warnbeamcurvature1. I split the curved part into smaller portions, but I still have this warning. Does it affect the results?
Thanks for your feedback. In the video of pile modeling in this channel, the effects of pore pressure is considered. 1.soil property>>define permeability 2.boundry condition>>define boundry of drainage 3.predifiend field>> define initial void ratio
Thank you so much for the video.It is very helpful.But i have a little problem when i change the section material,which is the step that you said in 25:08 . The calculate was aborted and shows "Too many attempts made for this increment".Could you help me about it ? I really appreciate it.
Thanks, I just got back to property module and edit soil section. There are a lot of reasons for "too many attempts" error, It should be checked(the meshing, defining soil properties, boundary condition etc..
Thank you so much for the video. It is very helpful. Would you please tell me how i can simulate 2% volume loss during construction. Or, would you please name any materials related to tunnel construction simulation considering volume loss? How about other methods - Load reduction, DCM, etc.? Thank you in advance
Hi can you please explain the boundary conditions if earthquake load is applied on this model.i kept the base fixed and am applying hz earthquake load on the left edge but i am confused about the boundary conditions for right edge
Do the following: 1. Enter density of saturated soil in material property 2 .you must use soils step instead of static general and customize pore pressure outputs in field output. 3. In load module define zero pore pressure for desired water table in the initial step. 4. At the end, from mesh module assign pore fluid/stress to the soil in element type. I hope it's helpful
@@alaaahmed3733Ok, I got it wrong with pile simulation and here we don't need define zero pore pressure. usually it will be used to define drainage boundary for drained or undrained conditions. thanks for your reminder.
Hello Alaa Why not, In the longitudinal direction, divide the tunnel into several sections. In each section, you first reduce the stiffness for the soil elements inside the tunnel, then add the lining, finally remove all the elements inside the tunnel.
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I think when you were defining the tie between surfaces, you chose Magneta for the edge of the surface, but I assume that Magneta arrowhead is the inner side. I am a little confused about this. would you please explain it a little?
In predefined Field 21:21
Vertical coordinator will be= -60 you take -1
And the stress magnitude 2 = -1750*9.81*60
But you take = - 1750*9.81*1
Can you explain why you take 1 ?
Hi, thank you for your video. I am modeling a similar geometry, but I receive a warning that says: for 32 beam elements either the average curvature about the local 1-direction differs by more than 0.1 degrees per unit length as compared to the default curvature or the approximate integrated curvature for the entire beam differs by more than 5 degrees as compared to the approximate integrated default curvature. this may be due to a user-specified normal or due to the nodal averaging routine used by Abaqus. this difference may cause unexpected behavior of the beam and you may want to verify that the beam normals are correct for your problem. the elements have been identified in element set warnbeamcurvature1. I split the curved part into smaller portions, but I still have this warning. Does it affect the results?
Could you show me how to do tunnel modelling under seismic loading?
Actually I haven't done seismic modeling. But in the future I will work in this field and record video
@@CivilSkill ok can you post a video for rectangular tunnel modelling? Your mail id if any?
Is that the resulting contour a time dependent variation or depthwise variation
Thanks for sharing
Really helpful
Thank you! Great Video!! I have been looking for this technique for awhile! Do you also know how to add pore pressure effects?
Thanks for your feedback.
In the video of pile modeling in this channel, the effects of pore pressure is considered.
1.soil property>>define permeability
2.boundry condition>>define boundry of drainage
3.predifiend field>> define initial void ratio
Thank you so much for the video.It is very helpful.But i have a little problem when i change the section material,which is the step that you said in 25:08 . The calculate was aborted and shows "Too many attempts made for this increment".Could you help me about it ? I really appreciate it.
Thanks,
I just got back to property module and edit soil section.
There are a lot of reasons for "too many attempts" error, It should be checked(the meshing, defining soil properties, boundary condition etc..
Thank you so much for the video. It is very helpful. Would you please tell me how i can simulate 2% volume loss during construction. Or, would you please name any materials related to tunnel construction simulation considering volume loss?
How about other methods - Load reduction, DCM, etc.?
Thank you in advance
Hi can you please explain the boundary conditions if earthquake load is applied on this model.i kept the base fixed and am applying hz earthquake load on the left edge but i am confused about the boundary conditions for right edge
@Fauzia Wani
Hi
I didn't work on earthquack load.
Can you please explain how we can check the max.stress analytically?
You should look for the equations for calculating the stresses created in the soil due to tunneling in references and articles.
Hello
Please I want to ask about something if possible
I want to consider the existing of groundwater table in the simulation. How can I do that?
Do the following:
1. Enter density of saturated soil in material property
2 .you must use soils step instead of static general and customize pore pressure outputs in field output.
3. In load module define zero pore pressure for desired water table
in the initial step.
4. At the end, from mesh module assign pore fluid/stress to the soil in element type.
I hope it's helpful
Thank you very much
When I have a groundwater at the ground surface why I have to set the initial pore pressure equals to zero since the soil is seems fully saturated ?
@@alaaahmed3733Ok, I got it wrong with pile simulation and here we don't need define zero pore pressure. usually it will be used to define drainage boundary for drained or undrained conditions.
thanks for your reminder.
Thank you for you. So in this case we just need to put the value of pore pressure for the desired depth. Am I right?
Hello. Can we use the stiffness reduction method in 3D numerical simulation?
Hello Alaa
Why not,
In the longitudinal direction, divide the tunnel into several sections. In each section, you first reduce the stiffness for the soil elements inside the tunnel, then add the lining, finally remove all the elements inside the tunnel.
@@CivilSkill thank you for the helpful answers and video. I hope you make a video for tunneling in abaqus in 3D !
@@alaaahmed3733 Ofcourse I will
@@CivilSkill thank you for your helping us
@@alaaahmed3733 You're Welcome
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Thank you ❤️❤️
Thanks you for useful to me
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Thanks you for useful to me