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  1. akamike

    Pony wall on top of foundation wall

    17' square addition to the corner of an existing house: The grade drops away a bit in this corner. Instead of bringing the concrete foundation wall up to the bottom of the first floor, the contractor wants to stop the concrete short and build a pony wall to support the floor. Pony wall would be...
  2. akamike

    Tension on top anchor at welded shear tab connection

    We have an embed plate in a concrete wall. A shear plate is welded perpendicular to the embed plate and a beam connects to the shear plate. If the beam were bolted to the shear plate, the tension in the top anchors would be calculated by multiplying the gravity rxn by approx 3" (dist from face...
  3. akamike

    Wind loads on bldg with stepped roof

    I'm determining the wind loads on the walls of a building that steps up twice in elevation. The horizontal dimension of the steps is 20'. Successive heights are 35', 61', 78'. Would you use a mean roof height of 78' to evaluate the entire structure? Or use 35' to evaluate wind loads on the...
  4. akamike

    Transferring shear from column base to slab

    Thanks, everybody! Dave, I'm hoping to transfer the load to some large footings at adjacent gridlines where it can be taken out by soil/conc friction and passive pressure against the footing. Unfortunately, jike, it's all seismic. (The brace was designed by others and I'm designing the foundation.)
  5. akamike

    Transferring shear from column base to slab

    I have a huge shear load (200k) at a TS6x6 braced frame column base that needs to transfer to the foundation. It's too much to take through anchor bolts into a spread footing. I'd like to transfer it to the slab on grade -- maybe thicken up the slab in this area. Any tips how to transfer the...
  6. akamike

    High moment on base PL, anchor bolts

    I have a base plate on a 54" sq pedestal with (2) 2-1/4 diameter x 27" anchor bolts on each of the four sides. There is a HUGE moment which puts the M/P eccentricity about 7 feet away from the center of the base plate. Assuming the base plate is thick enough that the failure is pullout or yield...
  7. akamike

    Vertical Seismic Component QE

    How do I calculate the vertical seismic component QE per IBC? The UBC had a formula used to calculate this component but I can't find one in the IBC. (I'm looking at a building that is 6 stories with concrete slab floors and masonry bearing/shear walls. I'm doing a spot check on a couple of...
  8. akamike

    Hole knocked in basement retaining wall

    Zo40, thanks for your reply. The floor joists run parallel to this wall so, no, it's not a bearing wall. I suppose that's good on one hand because not too much gravity load needs to be redistributed, but not good on the other hand because there's very little lateral restraint at the top. I...
  9. akamike

    Hole knocked in basement retaining wall

    Several years ago, contractors installed a new pipe through an existing 8" basement retaining wall (height = 7.5' above floor slab). They excavated behind the wall, knocked out a 24" diameter hole near the base of the wall (above slab), placed the 12" diameter pipe through the hole, placed some...
  10. akamike

    Wood moment frame connection

    I designed a steel moment frame for a residential 2-story window "wing" (no 2nd floor), but the contractor would prefer to use a wood moment frame. I have 12" of wall on each side of the windows. I'm concerned about the deflection (thanks to the much lower modulus of elasticity of wood). (a)...

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