PEMB Thrust Block?
PEMB Thrust Block?
(OP)
A contractor has left out a hairpin for a PEMB. I designed a grade beam to take the horizontal reaction. Seeing the size of the grade beam, he would like us to design a thrust block. As it will be near the ground surface, is this even feasible? If there is a 2500 psf bearing pressure and 100% could be realized it would need to have 17 sq feet of bearing area between 0' and 3' below grade.





RE: PEMB Thrust Block?
Can you install a threaded rod across the building, under the slab?
DaveAtkins
RE: PEMB Thrust Block?
If a wedge shape was used for the block, from 2x2 square to 6'dx8'w over a length of 3', we could get the required area based on passive pressure. The resultant of Pp would then be at 4' depth, the reaction at 1'depth, causing an overturning force of 120'k, seems severe. For a 3' constant depth, we would need to taper from a 3'x3' to a 3'dx30'w, also severe.
RE: PEMB Thrust Block?
RE: PEMB Thrust Block?
RE: PEMB Thrust Block?
Mike McCann
McCann Engineering
RE: PEMB Thrust Block?
RE: PEMB Thrust Block?
RE: PEMB Thrust Block?