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  • Users: bojoka4052
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  1. bojoka4052

    Solving a system of equations; is there a way to make sure all values end up positive?

    I get b_w as a negative value, is it possible to force this to come out as positive value?
  2. bojoka4052

    Not sure how to address forces from one beam to another

    I have beam 1) for which I have checked the loads. Ive been told I need to control for the moment and shear from beam 2) onto beam 1) aswell. I dont understand how this works, how does the shear and moment from beam 2) affect beam 1)? This is how the beams 1 and 3 look, they're supposed to...
  3. bojoka4052

    What are some examples of shear compression and shear tension?

    I know what shear is, I know what tension and compression is, but I dont understand what shear compression and shear tension means? Is this simply when shear causes either compression or tension in the member? Example of shear tension? Example of shear compression?
  4. bojoka4052

    What is the more conservative load placement?

    I have a symmetric bridge deck about the red line, except that one side has slightly higher stiffness at the end. If I were to place loads on only one side, where would it be more conservative to place, the side with higher or lower stiffness? Supports are along the yellow dotted line.
  5. bojoka4052

    Need to reduce amount of load combinations

    This is a bridge with five different lanes (Sidewalk, Driving lane, Driving lane, Bike lane and sidewalk). This is how my beam element model looks, each beam in the longitudinal direction (x-direction) represents a lane. Supports are all roller supports. The loads I have that can be on or...
  6. bojoka4052

    How can I check if my model makes sense?

    I have made the structure below with beam elements; the transverse beams (In the Y-direction) does not have all the properties defined and is only supposed to carry loads between the longitudinal beams (In the X-direction). The structure is supported by rollers, and I want to find out if the...
  7. bojoka4052

    Special cross section

    I have three section properties given per meter length as seen below which I need to define a beam element with: Transverse bending stiffness [m^4/m] Torsion stiffness [m^4/m] Transverse shear stiffness [m^2/m] I can multiply with a certain length to remove the per meter, but after that, where...
  8. bojoka4052

    Internal lever arm

    I am reading a text about bridge cross section and lever arm. The lever arm is mentioned in relation to calculation of section properties of the bridge. I was wondering if having a big lever arm in the cross-section (generally speaking) is good or bad? Is it conservative to assume a small lever arm?
  9. bojoka4052

    Could someone help me understand why I get error message at the end? [Mathcad 15]

    I dont understand why it says the variable at the end (b.w) is not defined?
  10. bojoka4052

    Trying to understand what is happening in this bridge report

    I am reading a report about a multicellular deck bridge and they talk about points of contraflexure, and they say members should be spaced closer than 1/4 of the points of contraflexure which I dont understand? The bridge has 3 spans as seen below (L1, L2, L3), the middle one has a length of...
  11. bojoka4052

    How to use the date I have, delete it, and replace it with next set of data? [Excel]

    I have a bunch of data as seen below, the data continues on with A4, A5.....N10 etc. The equations Ive made use the cells 72D, 73D, 74D... 72H...74L. I dont want to have to move the equation cells each time when I get to A2, A3....N10 etc. I was thinking of using the Data in A1, delete it, then...
  12. bojoka4052

    Different coupling types in Abaqus

    I have a surface which has different types of equipment on top of it which is not modelled. Nonetheless I want to apply the total load from these (P) on the surface by applying it to the reference point. I was wondering if it would be best to use kinematic, continuum or structural distributing...
  13. bojoka4052

    Apply concentrated force on reference point to spread out the load on surface

    I create tie constraint between the top surface of a solid elements structure, and reference point to which we apply a concentrated load. I want this concentrated load to be spread out over the surface: When I run the job I get the error: "Too many attempts made for this increment Job XXX...
  14. bojoka4052

    What type of constraints should I use inbetween the layers in Abaqus?

    I am thinking between concrete foundation - rubber bricks, and rubber bricks - ground floor. The rotating machinery causing dynamic loads on top of the concrete foundation will not be modelled, only the loads from here will be applied to the concrete foundation. How should I constrain these...
  15. bojoka4052

    Partition lines dissappear when I unlock the Assembly

    Ive been given an Abaqus CAE model someone else made from 2019, when I start to work at it on my Abaqus 2022 I need to unlock the assembly, but once I unlock it, it needs to regenerate but it fails to do so properly and some partition lines dissappear and I get a warning about constraints etc...
  16. bojoka4052

    What do these two terms in a structural dynamic problem mean?

    Rotating mass. The structure will have rotating masses attached to it. Rounds per minute (RPM). They say critical RPM is 6000 for object attached to a structure, when the machine starts there are some critical oscillations (?) and we need to accelerate past this RPM to avoid damage.
  17. bojoka4052

    Formula for shear force

    When I want the highest amount of shear force tau_max I use 3/2 x V/A as seen below: However I saw someone use 8/7 x V/A. I was wondering if anyone has seen this equation before where they use 8/7 instead of 3/2, is it a special case?
  18. bojoka4052

    Degrees of freedom/Temperature/Constraint error?

    I have two shell models where each has varying thickness connected with a tie constraint. I have temperature loads in my model, and when I run my model I get the following error for the nodes on one of the parts (XXX-1): "Error in job XXX: NO TEMPERATURE DEGREE OF FREEDOM EXISTS ON NODE 31...
  19. bojoka4052

    Could someone help me get a general idea of what is happening in this model? [Interaction module]

    There are two shell models on top of each other in the Assembly which are constrained with a tie. Then an interaction has been defined for several steps, and as I understand it "propogated" means the interaction in the last step will come over to this step aswell, but what does "built into base...
  20. bojoka4052

    Relation between modal shapes and degrees of freedom and response spectrum (seismic analysis)

    The text for the figure says MDOF (Multiple Degrees of Freedom)system and associated mode shapes; I fail to see the relation between mode shapes and degrees of freedom, is it so that a degree of freedom = a mode shape? So in the figure below we will have "n" amount of degrees of freedom and mode...

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