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  1. pepperoni

    precast stadium bleachers

    Brad: We will perform scanning and analysis and most likely load test too. We will be looking for a sub who can take the lead in the precast analysis portion.
  2. pepperoni

    precast stadium bleachers

    North-east us climate. The stadium seating is exposed to direct sunlight and the space below is used as storage. During temperature change, especially in the morning, when exposed to sun, you can hear the planks "pop". We will recommend a load test to confirm that the prestressed risers can...
  3. pepperoni

    precast stadium bleachers

    So it may be logical to say that the risers were underdesigned from day one and because of creep, shrinkage and loss of prestress the structure is experiencing significant deflections and basically reached its useful lifespan? Another question though, do you think that the type of connection...
  4. pepperoni

    precast stadium bleachers

    can you explain, do you mean the weight from the upturn 6x6 section? is it likely that creep will progress resulting in larger deflections and ultimately failure? if 4 to 5 x elastic deflection is reasonable assumption, what would be the deflection before failure and would the potential...
  5. pepperoni

    precast stadium bleachers

    please see attached sketch with dimensions and a picture. http://files.engineering.com/getfile.aspx?folder=15047fce-49fd-4bd5-b97a-6a09b3f03605&file=plank_dimensions.pdf
  6. pepperoni

    precast stadium bleachers

    TehMightyEngineer, no, unfortunately there is no documentation regarding the design or installation.
  7. pepperoni

    precast stadium bleachers

    HotRod10, the planks are prestressed, there are two visible anchorage access holes, patched with concrete. This is typical for all planks in the structure. My concern is if there is a progressive loss of prestress force, how would one establish the rate of the loss? The load test would...
  8. pepperoni

    precast stadium bleachers

    Measured 1.5in deflection is only due to self weight, the seating is currently unoccupied so no contribution from the live load. My understanding is that the camber in precast construction should account for deflections due to self weight so they are flat when installed. Actual 1.5in self weight...
  9. pepperoni

    precast stadium bleachers

    Dear all, my firm has a project where we are assessing the condition of the existing stadium structure. The stadium consists of precast bleachers supported by CMU walls. The building, in general, has a lot of issues due to the age and exposure to weather but the main concern is the excessive...
  10. pepperoni

    Underpinning

    Hi, In typical underpinning detail where new pins are installed, say 2' wide, in sequenced construction lowering the existing basement by approximately 4'. How the lateral pressure acting on exisitng footing is transfered to new pins if no dowels are installed only shims and grout. Does code...
  11. pepperoni

    Help in Etabs

    Create 2nd model and apply 25% of your lateral loads. Reduce shear stiffness coefficient for shear walls.

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