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  1. BatMan

    Column Base plate weld (Ordinary moment frame)

    How does physical weld prep look like for this gouge/backing weld with flush, especially through the weld access at the column web? Which weld may be more economical/better performance between the two...
  2. BatMan

    EOR & Shop Drawing Preparer

    Does anyone find it odd that an engineer-of-record submitted a detail to owner and turns around and gets the same job by the fabricator to do the shop detail? Is there a conflict here?
  3. BatMan

    Concrete crack

    I'm trying to find out general location and shapes of cracks in the foundation due to freeze/thaw, corrosion or even carbonation. The cracks that I'm seeing is a shallow footing with cracking all around at around 3~4" above grade. It seems like cracks/separation is happening at concrete covers...
  4. BatMan

    Ansys Mesh Export to other formats

    I'm new to Ansys, and wanted to use its meshing capabilities to generate proper mesh, then export in stl, iges or other formats so other software can read the mesh info. I typically use a FE software called SAP2000, but meshing is horrible on this. The elements I'd like to generate mesh are...
  5. BatMan

    Base Plate Hole Sizes - Cantilever & Moment Frames

    AISC Design Guide 1 lists recommended hole sizes of the base plate with respect to anchor rod sizes. These are much larger than AISC 360. My questions is if the hole sizes of the base plate is that much larger than anchor rods to accommodate tolerances and erection, should the base plate be...
  6. BatMan

    T-Beam Fixity single span

    Random question, but if a single span T-beam is casted in place, wouldn't this likely be detailed as fixed? Unlike precast girders, isn't it typical practice to develope top steel for cast in place beams or is it not always the case?Thank you for input.
  7. BatMan

    Tall Cantilever Retaining Wall - Sliding Resistance

    Hi all, Doing a 24-ft tall cantilever retaining wall with limited heel length (<5-ft due to prop. line). So this requires huge toe length (over 10-ft) and deep key at the bottom of the footing for sliding (4-ft). Now, this just seems a bit excessive and feel like I need to start looking at...
  8. BatMan

    As-Built Plan Record (Local Authorities)

    Just curious... Do local state Dept of Transportation store as-built plans of bridges? For buildings, it'd be stored by county assessor (never had luck finding one though).
  9. BatMan

    Moment Connection: WF Column &amp; HSS Beam

    I've been looking at different schemes to do a moment connection between a WF column to HSS rect/square beam (both sides of column). A bit of odd case here. It will be treated as a OMF (not a pre-qual connection). I'm trying to solicit some ideas as all I can come up with is using a welded plate...
  10. BatMan

    Foundation Settlement &amp; Raft on Piles

    Dealing w/ high water table with moderate seismicity here.. Geotech recommended using a raft on pile to bedrock at 40-ft below grade (some at 80-ft) 1. When does it trigger for geotech to recommend using piles over a mat foundation? If a mat settles one or two inches over a large area relative...
  11. BatMan

    Response Spectrum - Member Forces for Design Check (Tension only Element Brace and Column Force)

    Some advise needed here.... A braced-frame consists of tension-only element. Now, the analysis was done with Response spectrum method. Since the response spectrum method is linear analysis and the brace was modelled with beam-element having zero compression limit (requires non-linear analysis)...
  12. BatMan

    Aggregate Testing for Akali (ASTM C33 &amp; ASTM C295)

    When aggregate is tested per ASTM C33 on alkalinity, what additional (or more valuable) information on alkalinity when petrographic examination (ASTM C295) is performed? Or are these two complete set of testing requirement?
  13. BatMan

    Concrete Repair - Small retaining wall

    Hello, There is an existing retaining wall (short and no surcharge). Upper 6 inch of the stem wall is damaged and planning on removing that and re-concrete. Question: Is it feasible to remove / chip away the upper portion of the stem wall while leaving the vertical rebars in place or remove and...
  14. BatMan

    Shear wall + Steel cantilever Column (moved post to here..)

    I accidentally posted this in wrong thread, but here we go. I have a small two-story addition (~20 x 20). I'm putting Hardy Frame panels at corners of one side of the building, and putting cantilever on the other corners as shown in the doodling sketch. Is this an efficient approach? Reason for...
  15. BatMan

    Equipment Anchorage &amp; Thermal Movement

    Be nice guys....Here we go. I'm doing an anchorage of an equipment in a region with high seismicity. The equipment is not considered essential and is used in industrial warehouse (stubby, not very heavy). However, the client in concerned that anchoring the supports to existing slab will cause...
  16. BatMan

    5 psf lateral load for Hanging Partition

    So...I may be thinking too much or completely in a different world here. IBC requires 5 psf lateral load for a partition. I believe it has something to do with pressurization from HVAC or pressure differential. What about for a hanging partition? Is it still applicable? Wouldn't this be...
  17. BatMan

    Another Q' - Non Technical (Liability as Approving Official)

    Hello again, I'd like to hear what others think about reviewing and approving design/construction documents (not as building official, but as owner/developer/someone who puts out a contract). If submitted drawings/calcs are sealed by the contractor, is ultimate liability on the contractor or...
  18. BatMan

    Deflection for visibility

    Hi, I have a 10-ft beam span under uniform loading, supporting visual screens (projection similar to monitors). Deflection is at L/1000 and I want to know if this will be visible to end users at 20~40 ft away. For non building structures without specific deflection limit, what would be typial...
  19. BatMan

    Bridge Load Rating?

    Hi, New to bridge here, but had a question regarding Bridge Weight Limit. If a bridge is rated at "XX tons", what does that exactly indicate? Total weight of XX tons on a single axle at midspan? or spread out over two axles at some distance and only one axle loads the bridge or both? Any advice...
  20. BatMan

    SAP2000 Friction Modelling

    Curious on how to model friction between surfaces of shells or solids (both static and dynamic). CSI Wiki states to use gap link, but not sure it is actually applied. Can someone elaborate on this?? Shells or solids will be subjected to time-dependent loads and I'm after the displacements.

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