pre eng buildding no floor no frade beams
pre eng buildding no floor no frade beams
(OP)
I have a client who wants to put up a pre-eng building on cast in place concrete piles without grade beams and without a concrete floor. On an existing asphalt paved area. The frames span 60 ft and spaced at 25 f oc t. I don’t like it. Am I right?






RE: pre eng buildding no floor no frade beams
However, if the PEMB designer can design the building knowing the supports (cast in place piers) are likely to have limited lateral capacity, then it's doable.
RE: pre eng buildding no floor no frade beams
RE: pre eng buildding no floor no frade beams
RE: pre eng buildding no floor no frade beams
1. Coordinate with the PEMB designer and have them at least do a preliminary design where you transfer minimal base shear from the columns to the piles. This would allow you to use a relatively normal auger-cast or similar concrete pile for high uplift but low shear. It will lead to more of an expensive design in terms of the steel moment frames.
2. Plan on doing what Hokie suggested with a pile cap to deal with fully restrained bases and large base shear loads. More money on concrete and pile installation, but a more efficient steel design. But maybe the PEMB designer can do a quick and dirty frame or two for cost engineering purposes.
The owner has to pay for the structure one way or the other, so maybe a side by side comparison is worth it. I think a little bit beefier moment frame system and a simpler pile system would be more economical, but that is a gut reaction and not based on experience.
RE: pre eng buildding no floor no frade beams
RE: pre eng buildding no floor no frade beams
For Longitudinal Loading Condition, you either add a grade tie beam between pile caps or add another pile in triangular pattern. Also, for seismic area, tie or grade beams are
required to resist a minimum axial load of 10% of the total vertical column loads.
RE: pre eng buildding no floor no frade beams
Alternatively, there are ways to do tension ties to the pile on the opposite side of the building that wouldn't require grade beams. However, since I suspect the reason for not wanting grade beams is that they want flexibility for the slab, cutouts, trenches, equipment foundations and other items at grade most of those probably wouldn't work either.