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  1. Mohamed Zied

    Fatigue analysis using Abaqus

    Hi everyone; I am not an Abaqus expert and would like to check the overall behavior evolution of a steel girder bridge under the effect of fatigue. I intend to apply a movable (dynamic) load on the deck equal to the Average Daily Traffic ADT and Average Daily Truck traffic times 365 days and...
  2. Mohamed Zied

    Iterative/conditional loading condtion in Abaqus

    Thank you
  3. Mohamed Zied

    Iterative/conditional loading condtion in Abaqus

    It is standard I think. https://files.engineering.com/getfile.aspx?folder=80b7ca66-2b26-49c7-b515-20312c91f06b&file=Step.jpg
  4. Mohamed Zied

    Iterative/conditional loading condtion in Abaqus

    Hi, I am modeling a steel girder bridge and I would like to assess the effect of an increasing damage level on the remaining load-carrying capacity. Therefore, I want to increase the live load for each damage case until reaching the maximum deflection/ stresses for each damage model. Is there...
  5. Mohamed Zied

    Welding simulation

    Hi, I am modeling an existing built-up steel girder bridge (Shell element). The flanges have different thicknesses. The as-built drawings show that the connection is made by welding which stretches for a variable length (4 to 10 cm). When modeling, I didn't consider this detail. now, results...
  6. Mohamed Zied

    Random variables / statistical parameters of materials

    Hi; I would like to conduct a FEA of a structure using a probabilistic approach. Is it possible in Abaqus? If yes, how to input statistical parameters of materials (mean value, variance, bias factor ...) to Abaqus? Thank you in advance.
  7. Mohamed Zied

    Crack modeling in steel part: How to choose the mesh size?

    So, you mean that there is no way to simulate this for my model (3D shell elements)? In my case, I am assessing the effect of damages on the whole structure (Live load deflection, Maximum stresses in main members ...). The first case of damages was corrosion in different locations. Now, I have...
  8. Mohamed Zied

    Crack modeling in steel part: How to choose the mesh size?

    Thank you for your answer. I found that XFEM can not be used for 3D shell parts. Is it possible to simulate cracks in 3D sell parts using seams(Special --> Crack --> Assign Seam)? Thanks
  9. Mohamed Zied

    Crack modeling in steel part: How to choose the mesh size?

    I am assessing the effect of cracks in steel bridges. I chose the mesh size of 50mm for the whole bridge. When I modeled the crack (Cut in the shell element), I made the mesh smaller in the cracked part. But I had different maximum tensile stress values in the cracked part with different...
  10. Mohamed Zied

    Considering plastic properties when modeling with an Allowable Stress Design specifications.

    Thank you for your answer. Do you recommend I input fail stresses for material?? If yes, does it mean the allowable stresses set by the code ?? https://files.engineering.com/getfile.aspx?folder=d291a46a-71eb-4d20-b161-d71d17d3f9b2&file=Fail_stress.JPG
  11. Mohamed Zied

    0 Density Material or 0 thickness plate.

    What about the density or the thickness, can it be 0 to avoid any additional load to the structure?
  12. Mohamed Zied

    0 Density Material or 0 thickness plate.

    Hi, I want to assess the load sharing contribution of the deck and secondary members (bracings, diaphragms...) in a non-composite steel girder bridge. I conducted the assessment for the 1st case (deck without secondary members). Now, I want to assess the contribution of secondary members but I...
  13. Mohamed Zied

    Considering plastic properties when modeling with an Allowable Stress Design specifications.

    Hi, I am conducting an analysis of a steel girder bridge. I have to check stresses to be smaller than the allowable value presented in the design code (JSHB 2012 Version). It is an Allowable Stress Design code which means that allowable stresses are a portion of the yield stress ( 50 to 60%)...
  14. Mohamed Zied

    Excessive stress near the bearing (roller)

    Thank you for your answer. Actually, I found that it is a FEM issue called Stress singularity, and it often occurs near the supports (which is my case). This article explains it: https://enterfea.com/stress-singularity-an-honest-discussion/ I shared it with you because I thought it might help...
  15. Mohamed Zied

    Stress assessment in truss members

    Hi; I have truss (wires) members in my bridge model, and I want to assess axial (compression and tensile) stresses. In the attached screenshot, you can find the assigned beam orientation. In this case, which stress should I consider: S11, S22, or S33? Thank you in...
  16. Mohamed Zied

    Excessive stress near the bearing (roller)

    Hi, I got excessive stress near the bearing (roller) which is more than the allowable stress. The bridge I am modeling is an existing bridge. Thus, this local stress is not normal. I tried to refine the mesh near the bearing but it doesn't work. What is the solution to this kind of problem...
  17. Mohamed Zied

    Results extraction from Abaqus

    Hi, I have a bridge model made of two parts: the steel structure and the concrete deck assembled together using tie constraint. The model works normally. but since it is a non-composite bridge, I want to assess the stress in each part (steel girders and concrete deck) and mainly the bending...
  18. Mohamed Zied

    How to connect a concrete deck to steel girders?

    Hi Guys; The model is for a non-composite bridge. At first, I put all loads in the top flanges of the girders but I got some unexpected results. Therefore, I want to introduce the deck to assess the difference. What is the best way to connect a concrete deck (Shell part) to steel girders (Shell...
  19. Mohamed Zied

    Live load deflection

    Great, that's exactly what I wanted. Thank you so much.
  20. Mohamed Zied

    Live load deflection

    This is what I am doing. But, that deflection is the total deflection, what I need is the live load deflection for the node with maximum deflection. Is there any way to determine the deflection for each step? Thank you in advance.

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