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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

    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...
  3. 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...
  4. 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.
  5. 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...
  6. 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...
  7. 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%)...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. Mohamed Zied

    Live load deflection

    Hi guys; I have 4 steps in my model. the first is of course for boundary conditions, the second for self-weight. the third for the dead load (deck, railing, pavement ...), and the last is for the live load. I intend to increase the live load to reach the allowed deflection by standards...
  13. Mohamed Zied

    Some wires coming off the structure (Shell element) after loading.

    Hi, I build a 6 girders bridge using shell elements and I used wire for bracings. I ran my model successfully without errors, but I got some of the bracings (wires) coming off the structure as you can see in the pictures. the load is just a self-weight and deck load. Does anyone know the...
  14. Mohamed Zied

    What is the best way to connect a truss (beam) part and shell parts?

    Hi, I tried to connect a 2D truss part to Shell parts (girders), by using tie constraint and node regions. but it seems that it doesn't work because the truss part didn't appear in the visualization module I had this warning: "node set assembly_truss2-1-refpt_ has no members and will be...
  15. Mohamed Zied

    Tie constraints Issue: Warning messages

    Hi, I am modeling a bridge with 6 girders and many transversal elements. When I tied the first elements, I got this kind of warning messages: FOR *TIE PAIR (ASSEMBLY_SW5-3_SW5 Slave R-ASSEMBLY_G1-1_G1-SW5 Master 2), ADJUSTED NODES WITH VERY SMALL ADJUSTMENTS WERE NOT PRINTED. SPECIFY...
  16. Mohamed Zied

    How to avoid a huge number of constraints?

    Hi, I am building a bridge model that contains 6 girders and many transversal elements. I connected them using Tie constraints as you can see in the attached picture. I uploaded a picture of the model that represents only half of the bridge (3 girders), but still, at this stage, I have 96 tie...
  17. Mohamed Zied

    6 Girder bridge with a lot of transversal element: what is the best way to create the model?

    Hi, I am creating a model for a 6 girder bridge with a lot of transversal elements. I started to create a model for each girder type and for the complex transversal elements. Then, I created a model for the whole bridge where I assembled the girders and the transversal elements using Tie...
  18. Mohamed Zied

    Material orientation issue

    Hi, I used the same orientation for all parts but the problem persists in 5 of the 7 parts forming this girder, as you can see in the attached picture. I couldn't run my model properly because of this error: Error in job Job-4: The user defined normal of the material orientation of 20239...
  19. Mohamed Zied

    Error Message:"the following parts have some elements without any section assigned"

    Hi, I checked it many times, and there is no element without any section assigned. As you can see, the concerned parts are all green, if there was no section assigned, it would be grey. Moreover, the number of sets is equal to the number of sections assigned. have anyone faced this problem...
  20. Mohamed Zied

    Part modification: The pointer didn't snap in datum or intersection points anymore

    Hi, I wanted to modify a part that I created previously, but at some point, the mouse pointer didn't snap in the intersection point and the green lines didn't appear as usual. The pointer only snaps in the grid nodes. Do you know the reason for that and how to fix it? Is there any limit to the...

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