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  • Users: mfrad
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  1. mfrad

    Understanding Arches - Lintels Carrying Masonry

    Try a tied arch. Use an angle at the bottom.
  2. mfrad

    EOR's Responsibility to Respond to Clients

    phamENG, Definitely new agreement with new rates. Lump sum or time, your call. I typically have in agreement with owner to have GC to name my firm as additional insured. Did GC get permit for project? Did you file drawings with the building department? You wrote no special inspections, how are...
  3. mfrad

    Cover plate beam where shoring is not feasible

    Dennis59 I have used Steel WT's instead of WF’s successfully. Easier to weld intermittently both sides. Also make 2x6 template of existing beam since it has deflected some in order to cut wt’s web to fit.
  4. mfrad

    New wall over existing foundation

    Buleeek Before you design your foundation system first do a test pit along the existing building foundation to determine its depth and footing encroachment if any. It may have been a party wall only four feet of depth and not an independent foundation wall. You may have to underpin existing...
  5. mfrad

    Magazine Article About PEinc's Civil / Construction Engineering Business

    Congratulations on a great career, doing good work, and doing it with family. Good work brings more work. My partner was a Mole and I went to many dinners at the NY Hilton and also the Moles summer event and possibly we were there together. I would have loved to talk to you. I enjoy your...
  6. mfrad

    Neat Connection

    The steel beam may twist with only one bolt. Could be a problem for someone walking on the beam.
  7. mfrad

    Concrete Under 20 Degrees

    Thaw the ground- Use heaters or heated blankets to thaw surfaces where concrete will be poured. Pouring concrete on frozen ground will quickly cool concrete well below ideal temperatures. Using a heater to prep surfaces will prevent too-quick cooling or freezing and help keep the necessary...
  8. mfrad

    Stairs Bracing Retaining Wall

    Thanks Celt83; very useful and well organized and in one place. I bookmarked it.
  9. mfrad

    Engineer's Duty to Respond to the AHJ

    PhamENG AHJ most likely wants site specific building layout, soil borings, geotech report, seismic, snow and wind loads, foundation, plumbing, electrical drawings etc. Owner theoretically needs to hire his own arch, structural, mechanicals firms for a full package. The PEMB documents are...
  10. mfrad

    Structural or Shrinkage Crack in CMU?

    What about steel beam thermal changes perpendicular to the wall. There seems to be some out of plane movement.
  11. mfrad

    Cover entire concrete floor with steel plate

    Workers would be subject to electric shock as steel is a great conductor.
  12. mfrad

    New stairs

    Agree with others that you should consider a steel stairway design rather than precast within a steel building. you should get a hold of Design Guide 34 from AISC regarding layout to get a view of most but not all the requirements for a stair. Just be aware that stairs are typically designed...
  13. mfrad

    Architectural Feature Name

    "A dentil is a small block used as a repeating ornament in the bedmould of a cornice. Dentils are found in ancient Greek and Roman architecture, and also in later styles such as Neoclassical, Federal, Georgian Revival, Greek Revival, Renaissance Revival, Second Empire, and Beaux-Arts...
  14. mfrad

    Rule Of Thumb For Fillet Weld Size

    Veer007 Blodget's table is not based on weld strength, nor plate strength. Fillet sizes are proportional to either E60, E70 or E80 welding rods. His book covers both building and machine design. In buildings the bottom half of the table fillet welds are not economical, suggest dropping fillet...
  15. mfrad

    Rule Of Thumb For Fillet Weld Size

    Veer007, Your table came from Omer Blodgett's, "Design of Weldments" which is a good start. Everyone's comments are solid information. I added two tables from AISC as my starting point and I hope it will help you zeroing in on the weld strength or plate size. I would memorized Table 3.2 to...
  16. mfrad

    Spacing between Column Footings

    Using a 1.5V:1.0H slope would have an average pressure of about 7.5% at 2B depth. 1:1 slope about 4% avg pressure at 2B. Since these are approximations at footing center lines the footing edge stress at B depth following a Boussinesque curved profile will have somewhat lower average pressure so...
  17. mfrad

    Design of slab with opening

    t230917, An alternate approach is to extend the structure upwards at the manhole location as shown in the attached document which you can review and tweak. It will give more headroom and better access to the 4 ft high OSHA confined space for several people to work. This will provide better...
  18. mfrad

    Horizontal construction joint in large mat

    Follow SlideRuleEra's comments. Need to also control internal temperature of concrete (to be less than 160 degF)via circulating cold water through embedded piping. Important to avoid differential cracking. See ACI 301 and ACI 207 for more information. Anything over 3 feet is mass concrete per...
  19. mfrad

    Design a step footing to avoid underpinning

  20. mfrad

    Design a step footing to avoid underpinning

    TimeToPlay, I think going back to installing 5-ft deep underpinning piers is the way to go. You have a four story load bearing on soil that is also supporting the two-sty existing building. The new 4 story load and cellar wall load will most likely cause settlement damage to the existing...

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