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  1. cpb213

    Steel Truss Diaphragm High Seismic | Requirements/Tension Only

    @bookowski thanks for the response. The part of the commentary that makes me believe that ASCE 7 overstrength factors are not allowed is "capacity-limited design approach" "the Provisions requires that these elements be designed for the overstrength seismic load in accordance with the...
  2. cpb213

    Steel Truss Diaphragm High Seismic | Requirements/Tension Only

    Hi all, we are designing a structure utilizing BRB's and a horizontal truss diaphragm in the roof. After reading through the commentary of AISC 341 B5.2. It became clear that we can't use the ASCE 7 overstrength factor and should use a capacity limited design like a SCBF. Does anyone have any...
  3. cpb213

    Concrete Wall Serviceability Interaction Diagram

    Hi all, I am working on an underground structure with strict crack control requirements. The perimeter walls are subjected to high out of plane flexural forces along with the axial compressive forces. Does anyone know of a good program or reference for developing serviceability interaction...
  4. cpb213

    ACI Wall Corner Diagonal Bar

    Hi All, I have a detailing question about the diagonal bars shown in the ACI Detailing Manual's details for Reinforcement at wall corners. I do have a water retaining structure and are including them in the details but I can't find any good description of how these bars should be detailed...
  5. cpb213

    SAP2000 Graphic Printing

    Hello, Is there a way in SAP2000 to print multiple graphics at the same time? I need force diagram graphics for different components of a structure and every time we make a change, I need to reprint all the diagrams. For example, for one of our slabs I need to print max/min diagrams for M22...
  6. cpb213

    Minimum Steel in a Arched Concrete Slab

    Hello All, We have a underground structure that has an arched concrete roof. The roof is in complete compression and transfers the loads to the exterior walls. Someone had mentioned to me that we need to provide at least 1% reinforcement ratio because its a compression member. This arched slab...
  7. cpb213

    ACI Minimum Wall Reinforcement - Out of Plane Bending

    So I read through the ACI SP-17(14) "The Reinforced Concrete Design Handbook" last night and with regard to minimum vertical tensile reinforcement for cantilevered retaining walls they state that because of "lack of redundancy" in the cantilevered stem wall to use minimum requirements for beams...
  8. cpb213

    ACI Minimum Wall Reinforcement - Out of Plane Bending

    Usually, I would just go with the conservative option but this is a design build project so I need to justify the conservative approach. I completely agree that the 4/3 Asreq provision is not applicable at all and I won't have trouble pointing that out to the contractor. Does a cantilevered...
  9. cpb213

    ACI Minimum Wall Reinforcement - Out of Plane Bending

    I am designing a deep shaft (100' deep) that has multiple landings for stairs at different elevations and the contractor is questioning our design stating that it is too conservative. The shaft resists soil on one face only so the reinforcement was controlled by out-of-plane bending. We...

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