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  1. sjhgeotech

    Calculating Pressure of Moving Water on Foundation

    Ingy, Section 13.18.1.1 of the AASHTO gives equation (3-4) as Pavg = K*(Vavg^2), where the Pavg equals pressure in pounds per square foot. Where did you get your equation F = (rho)*(A)*(Cd)*(V^2/2g) Also, I have round concrete piers. What friction factor Cd do you recommend and is there a...
  2. sjhgeotech

    Calculating Pressure of Moving Water on Foundation

    Does anyone have a tip on how to calculate the force exerted on a stationary object by a moving mass of water (e.g. pylon foundation in a river)? Thank you.
  3. sjhgeotech

    Civil PE Startup

    I have a few opportunities to review and seal drawings for a housing contractor. What type(s) of insurance should I carry to cover liability? Thanks!
  4. sjhgeotech

    NYS Building Code?

    Can anyone tell me where I can purchase a NYS Building Code? Thank you!
  5. sjhgeotech

    Foundation for House on Lake-Shore with Slate Rock

    We are designing a 2 story, 2500 sf house to sit on a lake-side slope, where the slope of the earth is about 45 degrees to the edge of water. There is highly fractured shale just below 6 inches of slag material on the side of the hill. I am looking for some ideas on foundation types. Thought...
  6. sjhgeotech

    Wet silt

    If you are dewatering the silt below the footings, aren't you concerned about settlement of the footings after they are installed? I would recommend dewatering before installation of the footings. Was there any consideration for using drilled piers (caissons) and using grade beams?
  7. sjhgeotech

    Column Anchorage into Concrete--Number of Bars

    I have a steel column baseplate that is connected to a concrete foundation with anchor bolts. The anchor bolt nuts have corroded off and there is no way to get new nuts on the connection. The column is one leg of a four legged radio tower and is in complete tension of about 55 kips, max load...
  8. sjhgeotech

    Reinforcement in Sidewalks

    What minimum reinforcement is required in sidewalks? Is ACI-318 the source? Thanks.
  9. sjhgeotech

    Residential Foundation--Bracing Sidewalls

    So for a 60 foot long wall, you would install 16" (I-joists 16" on centers) of I-joist at 6-foot centers, for the first three bays? It seems like this would cause a torque in the I-joist unless they were continous through every bay? I will check with the manufacturer. Thanks.
  10. sjhgeotech

    Residential Foundation--Bracing Sidewalls

    The floor system is comprised of I-joist with 3/4" plywood. The I=joist run parallel to the end walls. The bottom of the end wall is essentially simply supported by the 4" slab at the bottom, but the top is free with the first I-joist basically nailed to the top of the wall. I think that the...
  11. sjhgeotech

    Settlement of Pile Group

    The 60-degree method is the one that I am familiar with. Calculate the area of the pressure influence at the mid-layer of the settling clay using a 60-degree projection from horizontal at 2/3rds of the pile length. Das's book has some more information on this.
  12. sjhgeotech

    Residential foundations for expansive clay

    I have a question regarding the use of "poly" fabrics below foundation slabs. When should these fabrics be used and what is their purpose? Should they only be used on clay soils and does the concrete get poured directly on top of them, or does well graded sand or gravel go on top of them...
  13. sjhgeotech

    Elastic Settlement

    C.V. Chelapati provides some information on the elastic settlement in non-cohesive soils (e.g. sands). He provides information for a small foundation (foundation width less than 20 feet), but I don't have anything that discusses a large surcharge. The following equation can be used if the...
  14. sjhgeotech

    Residential foundations for expansive clay

    I have a similar situation where a builder wants to place a foundation on a saturated clay located at 10 feet below existing grade. What tests should I run to determine the soils sensitivity? Obviously, if the water table ever drops below the depth of the foundation, settlement is going to be...
  15. sjhgeotech

    Residential Foundation--Bracing Sidewalls

    A builder is concerned about the transfer of lateral pressures from then end-walls of a house foundation (9-foot pre-cast walls) to the floor system. The foundation walls that run perpendicular to the floor beams transfer load directly to these beams, so those walls aren't a concern. However...
  16. sjhgeotech

    H-20 Loading, Pressure

    Thanks for the information SlideRuleEra...the article was extremely helpful!
  17. sjhgeotech

    H-20 Loading, Pressure

    I need to design a buried pipe for an H-20 loading. What area due I apply the load over at the surface of the ground? Should I only use the 32 kip load? Thanks!

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