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  1. Buzzbromp

    Stiffened Diaphrams

    Hi, I posted this thread a week ago and thank you for the responses. I have a question regarding lateral torsional buckling. I have a plate that is stiffened with T-sections along its length, such that the web of the tee is welded to the plate. The plate is approximately 270 inches long...
  2. Buzzbromp

    lateral torsional buckling of a stiffened plate

    I have a question regarding lateral torsional buckling. I have a plate that is stiffened with T-sections along its length, such that the web of the tee is welded to the plate. The plate is approximately 270 inches long and wide, with approximately 12 tees spaced 18 inches apart (approximate)...
  3. Buzzbromp

    Initial Conditions

    I was adjusting my model a variety of ways and noticed that if I apply gravity as with time effects turned off, it doesn't matter if i reapply it with time effects turned on if my transient loading is a displacement time history. Results were the same whether i applied gravity or didn't apply...
  4. Buzzbromp

    FSUM vs SMISC

    I was wondering if anyone had issues or success using FSUM to extract results for a transient analysis. I applied a displacement time history to the base of my 2D model, and have been trying to get the shear and moment at different locations along the length using the FSUM command. I was able...
  5. Buzzbromp

    time history analysis

    Thank you for your reply. Maybe i wasn't clear. I understand that forcing the entire structure to accelerate due to the time history is not realistic. That is why I was trying to apply the displacement time history to the base. However, results do not look good as they shears and moments do...
  6. Buzzbromp

    time history analysis

    I have a 3D model that is fixed at its base. I have both a acceleration time history and displacement time history to read into my model. I've tried 3 scenarios. First, i ran the acceleration time history on my model using using the mode superposition method. I applied the acceleration to...
  7. Buzzbromp

    Concentrated Loading on Concrete Decks

    Thanks for the info. It seems that the formula listed on the njb-united.com link is limited by 8.9*t/h and is a function of both thickness of slab and location of loading. While the formula i found in a structural engineering handbook (width of load + 2*0.6*a) where a is location of loading on...
  8. Buzzbromp

    Concentrated Loading on Concrete Decks

    ...to the traffic path and one case for reinforcement perp. to the traffic path. The perpendicular case uses a a formula (something like ((S+2)/32)*P(tire) to calculate a moment to use on the 1 ft width that is typically analyzed for available strength. I believe this is specific to wheel...
  9. Buzzbromp

    angle bracket

    ...with a row of high strength HILTIs 3" from the top, i took the 23 kip load and applied a moment arm of 4", and came up with a Pullout load of 23*4/5 = 17.5 kips (2 gusset plates at the center of the bolts stiffen the angle to pivot at its end). There are 3 bolts near each beam spread out 12"...
  10. Buzzbromp

    Proper Lateral Bracing

    The beam has not visibly deflected horizontally. Its just that if I assume the beam is braced adequately, my bending stress is approximately 80% of my allowable, while if I'm not braced adequately, my bending stress is approximately 150% of my allowable. I would say that either my concrete...
  11. Buzzbromp

    Proper Lateral Bracing

    Thanks for the inputs. This beam is an existing beam and did not have any shear studs installed. There was no metal deck form, and the concrete around the top flange has spalled along its length in various magnitudes. The fixed strut connection is a good point, that makes sense that it would...
  12. Buzzbromp

    Proper Lateral Bracing

    I have 2 questions regarding the lateral bracing of beams. First, when can a concrete deck sitting on a beam be considered to adequately brace the beam laterally? I know you can put shear studs in the beam, which would obviously brace the top flange from lateral movement. If there are no...
  13. Buzzbromp

    Corroded Cross Section

    I forgot to ask, does anyone have any good references to read regarding the evaluation of deteriorated existing members?
  14. Buzzbromp

    Corroded Cross Section

    I am looking for opinions on the evaluation of corroded steel W-sections. When you have a new section, it is easy enough to calculate your sectional modulus, and your maximum bending and shear stresses. Regarding your allowables, you can easily determine if you are compact, non-compact, or...
  15. Buzzbromp

    Welded Connection

    Jeff- This would be conservative to the beam, but would it be conservative to the tee welded connection?
  16. Buzzbromp

    Shear flow on Welds

    Thanks, that's what i figured
  17. Buzzbromp

    Welded Connection

    I am wondering if this connection is considered fixed or SS. Originally, it was a bolted connection, a beam with angles bolted to its web and the web of the beam it was bolted to. Due to existing conditions (heavy corrosion around the connection), constraints around the area, etc, one foot of...
  18. Buzzbromp

    Shear flow on Welds

    I was wondering how you design welds for shear flow along a built up girder (i.e. the flanges are welded to the web) with a distributed loading. Say you have a simple span with a uniform distributed loading, you shear would be a linear function of the location along the beam, with the greatest...
  19. Buzzbromp

    Transverse Stiffeners and Diagonal Stiffeners

    The buckles extend almost the entire height of the web, and buckle in plane (no twisting). They occur all along the length of the beam. Yes, shear load seems fine, but is it possible to get this kind of buckled shape from bending? The flanges exibit no deformation.
  20. Buzzbromp

    Transverse Stiffeners and Diagonal Stiffeners

    ...to plates that extend very far in either direction, with other webs down the line, so when analyzing these as a flange width, i used the formula 2*t(flange)*(E/Fy)^(0.5) to calculate the effective width. the thickness of the top and bottom plates are 0.5 inches, which yields an effective...

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