I'm working on a work trestle for an upcoming bridge construction project. The contractor would like to back trucks with bridge beams onto the trestle for unloading. The truck/trailer/load will be +/- 140 kips on 6 axles. The trestle beams are simply supported spans. I'm trying to do this by...
I am designing a tie beam between two drilled shafts. My tie beam is 39" tall x 42" wide. I have a question about AASHTO LRFD 7 Temperature and Shrinkage steel requirements. I calculate a required area of steel = 0.22 in^2/ft. AASHTO calls this "area of reinforcement in each direction and each...
I'm trying to develop a strut and tie model for a beam connecting an overhead sign structure to a pair of drilled shafts. I'm having trouble developing the truss for the analysis. I've been following ACI publication SP-208 and SP-273 (Examples of Strut and Tie Models), AASHTO LRFD7, and Design...
Hi,
I've read about the CAST (Computer Aided Strut and Tie) program from University of Illinois. I can't find the download for this program anywhere. Does anyone know if it is still available? The only download I have found is from a website in Thailand. Ideally, I'd like to find a more...
Hi,
I am looking into the design of drilled shaft foundations for overhead sign structures. I was wondering if anyone knows of a good reference for structural design of a "pier cap" that connects a pair of drilled shafts?
Attached is a sketch of what I am trying to describe.
Thanks for the...
Hi,
I am trying to find a relationship between spacing of displacement piles and an increase in relative density/SPT value. I have not had much luck, other seeing that soils are densified for 3-5 (or other values depending on the source) pile diameters from the driven pile.
I am hoping to find...
