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...
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...
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...
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...
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...
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...
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...
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)...
