I have designed a wet well for a pump station (water only) with 18" thick walls on a 24" thick base slab. I have shown a 3 1/2" wide by 1 1/2" deep keyway in the top of the base slab at the center of the wall with a bentonite water stop in the keyway. Both ACI 318 and 350, Sections 6.4.2 call...
I have designed a large residence in California which is supported by 16 inch diameter drilled piers (caissons). I have specified #3 ties with a spacing of 6" o/c for the full length of the piers. The contractor is proposing to use a continuous spiral instead of individual ties. The code (UBC...
Is there a code requirement that requires an asphalt shingle roof to be designed for 2 layers (original plus one overlay). I work in California which still uses the 1997 UBC.
Thanks
I am designing a concrete pile cap/beam for a center bent of a 2 span bridge. The piles are HP 12x74. The concrete pile cap/beam is 28" wide and 30" high. The piles are to be embedded 12" into the bottom. Do I need to check the concrete bearing stress at the top of the piles? If so, do I...
I am building structural engineer taking a graduate level steel bridge girder design class. We are using a very old shareware program (DOS based) to perform the analysis of the girders and then transferring the information into an EXCEL spreadsheet to plot the moment and shear envelopes. Is...
I am interested in obtaining a copy of research done by Ploessel and Slosson (1974) regarding the level of seismic response actually felt by a structure as compared to the peak ground acceleration. Does anyone know where I can obtain a copy?
I am working with someone who is interpreting this...
A question for the geotechnicals:
As a structural engineer, I typically design retaining walls with a 1.5 factor of safety for sliding. When allowable friction and allowable passive pressure values are given in a soils report, do these already have a safety factor built in (as in allowable...
Can anyone direct me to design criteria for Segmental Retaining Walls? The height of the walls will vary from approximately five feet to eight feet and will require geosynthetics to reinforce the earth behind the wall.
