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  1. JennyNakamura

    Leaving my employer and taking others with me - unethical?

    I work for a firm with a small structural department (4 structural engineers and one drafter). We also have similarly small civil, electrical, and construction management departments. Everyone in the company is not happy with the fact that no one has had a raise in 5 years and no kind of bonus...
  2. JennyNakamura

    Design References for Circular Foundations

    Can anyone point me in the direction of some good references for designing circular foundations. I am interested in learning the proper way to calculate bearing pressures due to overturning moments and detailing radial reinforcement. The foundations would be for use with things like water tanks...
  3. JennyNakamura

    Battered Micropiles for Lateral Resistance

    Hi Everyone, I am working on a project that requires a significant amount of micropiles. It is a 150' long retaining wall with about 24' of retained soil and large lateral seismic loads and traffic loads. The geotech has specified micropiles for the project, noting that for lateral resistance...
  4. JennyNakamura

    ACI 318 Appendix C Load Combinations

    Does anybody ever use the load combos in ACI App C for strength design? I never give them a second thought, but today while working on a footing design I used Enercalc (an older version) to check my hand calcs and the output showed that the program uses App C. Then I pulled out an old college...
  5. JennyNakamura

    Who designs cofferdams - EOR or Contractor?

    Hi everyone, When cofferdams or some other kind of stream flow diversion is required for bridge foundation retrofitting, are they designed by the engineer of record and shown on the contract drawings or are they designed by the Contractor (or his specialty engineer) like would be the case with...
  6. JennyNakamura

    Concrete Retaining Wall Retrofit

    Hi everyone. I'm working on a concrete retaining wall that needs to have its original flexural capacity almost doubled do to a change in use. The wall is about 13 feet high and currently supports an unused field overgrown with weeds and has been there for about 65 years. The land has been sold...
  7. JennyNakamura

    Timber Piles with Concrete Pier Cap - Neglect Cap for Bearing?

    Hi all, I am analyzing an existing 75 year old bridge for a seismic retrofit. It is a 4 span bridge with concrete superstructure and concrete pier walls on concrete caps and timber piles. When checking the axial capacity of the piles (for both gravity and seismic), several people have told me...
  8. JennyNakamura

    Post-Installed Mechanical Concrete Anchors - ICC Approval Required?

    Hi Everyone, I have a large commercial PV project where several hundred solar panels will be installed on the concrete roof of a large industrial building. I knew the contractor would want to use screw anchors, so I spec's Brand A or Brand B because I knew they had ICC approvals. The contractor...
  9. JennyNakamura

    T1-11 Siding as Roof Sheathing

    Hi Everyone, Background: I have designed a simple patio canopy that is 20'x20'. It's like a deck in the sense that it is attached to the existing house wall framing by a ledger and the joists are attached to the ledger. I currently have the roof designed as 2x6 T&G decking spanning the joists...
  10. JennyNakamura

    ACI Appendix D - Applies Only to Anchors 2" Diameter or Less?

    Hi Everyone, I am designing a concrete connection using HRC headed rebars with 2.25" diameter (#18). I am using App D to check concrete breakout so I can determine how deep the HRC heads need to be. According to D.4.2.2 (I am using ACI 318-02) the equations in App D for concrete breakout are...
  11. JennyNakamura

    EOR Design Drawings for Pre-Engineered Roof Trusses

    Hi Everyone! As the EOR for a new building with pre-engineered roof trusses (wood or cold-formed steel), do you show a roof plan with C&C pressures and zones for the truss designer/fabricator? Or, do you just state the required wind design parameters on the notes (Kzt, Kd, V, exposure, etc.)...
  12. JennyNakamura

    Section Modulus for Calculating Concentrated Load on Plywood ???

    Hi everyone, I have never had to do this before, but I am trying to calculate the capacity of a plywood panel to support a concentrated load. For checking flexural stresses, I am using the typical f=M/S. This is consistent with what I have seen in the NDS 2001 and 2005 Manuals. However, upon an...
  13. JennyNakamura

    All Thread A615 Rebars in Lieu of F1554 Anchor Rods?

    I was asked to review calculations and drawings for the foundation design for an out-of-state supplier of wind turbines. I noticed on the drawings that they called for #7 A615 Grade 75 "Anchor Bolts" and immediately marked the drawings and calcs that A615 Grade 75 is a rebar designation, and...

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