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  1. CWEngineer

    Pile Supported Retainig Wall - Reference/Example

    Hi, I am looking for a reference that shows an example/guidance to design a pile supported retaining wall. Hopefully, it shows all the hand calculations from transferring the loads from the wall, onto the pile cap then H-piles (single or group) and maybe the use of L-Pile. Do you guys know of...
  2. CWEngineer

    Depth of Embedment into footing required for wall reinforcing terminated using standard 90-deg hook

    Trying to get clarification regarding the requirement for the Depth of Embedment into footing required for wall reinforcing terminated using standard 90-degree hook (development of Standard Hook in Tension), per ACI 318-14, para. 25.4.3 (ACI 318-08, para. 12.5). 1. Is this requirement only...
  3. CWEngineer

    SAP Sign Convention

    I am trying to get clarification regarding the sign convention in SAP, in particular for the moment diagram. My understanding is that SAP shows the moment diagram on the tension side of a beam. Also positive moment is when there is compression in the Axis 2 side of the beam. In the attached...
  4. CWEngineer

    Minimum Retaining Wall Height below which Design is not Required

    I am trying find some guidance stating minimum heights below which a design is not required for a retaining wall. For example, if a wall height is 3 in, 6 in, 9 in, etc. is a design required for a retaining wall? Appreciate your advice. Thanks
  5. CWEngineer

    Dowels using ACI 318

    I am trying to figure out information for rebar in tension (vertical rebars connecting an existing concrete slab to a new concrete section on top). The tensile strength of grade 60 bar is 90 ksi and the yield strength is 60 ksi based on Table 2 of ASTM A615-16. Currently, I am looking into...
  6. CWEngineer

    Retaining Wall - Using Passive (Resisting) Pressure in Capacity Analysis of Stem Wall

    I am seeking guidance regarding the use of passive (resisting) pressures to assist in the analysis of the structural design of a stem wall. EM 1110-2-2502 allows the use of passive resistance for structural design (please see attached document). Would it be acceptable to use the net factored...
  7. CWEngineer

    Pile Cap Loading in Pile Supported Wall

    Trying to get some clarification/guidance regarding the loading on a pile cap. Please see attached drawing for reference. Basically the pile supported floodwall was design with continuous longitudinal reinforcement in the pile cap. The pile cap has longitudinal and transverse reinforcement...
  8. CWEngineer

    Pile Supported Floodwall - Dowels within Transverse Joints of Pile Cap

    I am working on an extension of a pile supported flood wall. We will be adjoining another pile supported flood wall next to the existing pile supported flood wall. The longitudinal reinforcement in the pile cap must be continuously reinforced (i.e, the reinforcement must go through any...
  9. CWEngineer

    1.5 inch deep horizontal slot within an 8 inch thick brick wall

    I am looking into embedding a 3/4" inch water pipe into a brick wall for a house in Mexico. The wall is approximately 45 foot in length, and approximately 10 to 12 feet high. The waterline will placed approximately 2 feet above the ground. The wall has concrete columns at both edges with a...
  10. CWEngineer

    Doweling (Anchoring to Concrete) Rebars - Guidance (ACI 318?)

    ACI 318-11, has the Appendix D- Anchoring to Concrete section. However, in Para. D.2.2 it states that "Reinforcement used as part of the embedment shall be designed in accordance with other part of this Code." Does this mean that Appendix D is not applicable to rebars? Thanks
  11. CWEngineer

    Bending Flexural Vertical Bars in Stem of Retaining Walls after concrete has been placed

    When is it appropriate and not appropriate to bend reinforcement? Currently, looking into some vertical (flexural) bars in the stem of a retaining wall that have already been placed in the concrete footing. The vertical (flexural) bars were placed 1 inch from where they were supposed to be...
  12. CWEngineer

    Standard Hook for horizontal bar

    Trying to figure out the criteria for providing a standard hook in a horizontal rebar. I have seen statements to use a standard hook on a horizontal rebar if you have a top bar or 12 inches of concrete below, but have not seen that in ACI 318. Also is a standard hook required for a...
  13. CWEngineer

    RCP - Design for Cradle or Concrete Slab on top of Pipe for Vehicular Loading

    Do you guys know of any reference or guidance to use to design a reinforced concrete cradle or a reinforced concrete slab on top of an RCP? Basically, a road on top of an RCP is going to be lowered to about 6 inches or 1 foot above the RCP and I want to make sure the vehicular loading does not...
  14. CWEngineer

    Scale for Cells in Microstation V8i vs J

    In Microstation J, I had the cell scales set up based on the design working units of 96000. For example if I had a drawing and the detail was going to be 1/16" = 1', the cell scale would be 196; if the detail was going to be 3/8" = 1', the cell scale would be 32, etc. All my cells look...
  15. CWEngineer

    Vertical Reinforcement in exposed face of Wall

    How do you typically design the vertical reinforcement in the exposed face of a wall, when you just have soil in the backside. I have seen the vertical reinforcement in the exposed face of the wall being designed using 10% of the vertical reinforcement in the earth face, but haven't been able...
  16. CWEngineer

    Retaining Wall or U-Frame design with 3,000 psi concrete but 4,000 psi used for construction

    Say a retaining wall or u-frame structure are designed using a concrete strength of 3,000 psi, but during construction a higher concrete strength, such as 4,000 psi is used. Do you guys/girls see anything that might be unconservative in using 4,000 psi concrete strength during construction when...
  17. CWEngineer

    RCP (D-Loads) - Placing materials with different unit weights along profile

    Do you guys see any issue with placing different types of materials along the profile of an RCP or is this acceptable? For example placing a slurry (unit weight of concrete of 150 pcf) for certain length of the pipe, then placing soil with 139 pcf for the remaining length of the RCP? Thanks
  18. CWEngineer

    RCP Design - (height of fill to use when designing on a slope)

    Are there any requirements for the selection of the height of fill above an reinforced concrete pipe when the pipe is beneath a sloped ground surface? I assume, you would design the pipe for the maximum height of fill, minimum height of fill and 2 feet of fill. However, I am not sure if you...
  19. CWEngineer

    RCP - Placing rock or grouted stone directly on top of a pipe

    Typically, I use 2 feet of soil cover minimum on top of a reinforced concrete pipe. Do you guys know of some code/reference that prohibits placing rock or grouted stone directly on top of an RCP? To me placing rocks or grouted stone directly on top of a pipe does not make sense, but it would...
  20. CWEngineer

    Soil-Foundation Friction Angle (Friction Angle for Foundation Surface)

    I am trying to get some clarification regarding the Soil-Friction Angle (Friction Angle for Foundation Surface). Have seen different calculations from the different sources, for example NavFac 7.2 - Table 1 (and other sources) uses a friction factor of tan (delta), with no Safety Factor...

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