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  • Users: graybeach
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  1. graybeach

    Bearing Pressure at Toe of Gravity Dam

    I am updating a calculation where the bearing pressure at the toe of a gravity dam is calculated in the usual way, depending on whether the resultant is in the middle third. Uplift is initially assumed to be a straight line from heel to toe and adjusted by iteration to full headwater pressure...
  2. graybeach

    Harbin Bridge Collapse

    Some good photos of the Harbin Bridge collapse in china: http://www.chinasmack.com/2012/stories/harbin-bridge-collapse-poor-construction-or-overloaded-trucks.html
  3. graybeach

    Beam end restraint

    Hello all, I'm in a discussion with an engineer I work with about whether and where stiffeners are required for the assembly shown on the attached sketch. The W18 beams will be installed beneath badly deteriorating concrete beams to prevent collapse should the concrete beams fail. The top...
  4. graybeach

    Bond breaker for underwater contraction joint

    Hello all, I'm designing repairs for some large vertical spalls in a dam structure. Typical size is 6 feet wide by 12 feet high by 1 foot deep. The water level fluctuates, and the spalls may be partly underwater during repairs. To save money, I am trying to come up with a way this could be...
  5. graybeach

    Eccentric load on a wide flange beam.

    Hello all, I have been asked if it would be ok to hang a load of about 1.5 kips per foot (unfactored) along the tip of one of the flanges of a W8x31. The beam is a 16' simple span and only the web and the unloaded flange are supported at the ends. The load is parallel to the web. See...
  6. graybeach

    Passive Ventilation

    We are currently replacing the roof and siding on an existing building in the northeast US. The building is 25 feet wide by 55 feet long by 85 feet tall and houses some infrequently used mechanical equipment. Basically the building consists of a heavy steel frame, the equipment, and the...
  7. graybeach

    Forebay Debris Removal

    This might seem trivial, but my utility is really cracking down on contract claims and extras. Currently I am preparing bid documents for a removing debris (tree stumps, trunks and branches, mainly) from the intake area of a medium size hydropower plant. Does anyone have any ideas of what the...
  8. graybeach

    Extending a pipe sleeve

    Hello all, I need to extend a 3" schedule 40 pipe sleeve (wall thickness 0.216 inches). This will involve chipping away the concrete around the pipe, and welding on a 4 inch extention. We are doing this so we can pour a concrete curb around the extended sleeve. How should the new sleeve be...
  9. graybeach

    Quality of Underwater Concrete

    I am working on a project that involves a mass placement (100 CY, about 5 feet thick) of underwater concrete. The purpose of the concrete is scour remediation. My question is: What are some options for verifying the quality of the concrete? The concrete is not load bearing, but we want to...
  10. graybeach

    Should RFP include estimated construction cost?

    I work for a utility and am preparing an RFP for engineering design services to rehabilitate a large industrial building. Based on a previous engineering inspection, a fairly detailed list of anticipated construction items has been assembled. I am including this list in the RFP, but I am...
  11. graybeach

    New consultant building upon old consultant's work

    Hello everyone, I work on the owner’s side. A couple years ago, we had a consultant prepare a design to rehabilitate the façade of a large 40 year old vent shaft building. The work was to consist of localized repairs and recaulking. When, due to budgetary concerns the work was pushed out two...
  12. graybeach

    Pouring concrete against carbon fiber fabric

    Hello everyone, I have an existing 20 foot high, 2 foot thick interior CMU wall, and I need to construct a 2' x 2' cast-in-place reinforced concrete column directly against the end of the wall. The loads are very small on both the wall and the future column. Prior to placing the concrete, I am...
  13. graybeach

    Specifying 4140

    To save time, a fabricator has suggested machining some leaf spring retainers out of AISI 4140 instead of casting in ASTM A27 Grade 70-36. The retainers are part of replacement intake gates at a hydro plant. Cast steel was was used for the retainers on the existing 50 year old gates and has...

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