thread378-380811 Can anyone tell me what are Design Indices on page 3 of output? https://files.engineering.com/getfile.aspx?folder=aafae2b5-6907-4638-84e9-11290eb91020&file=scanner@permatile.com_20240619_084501.pdf
I have a design for 60" inside reinforced concrete pipe with 142 feet of soil for an embankment design. https://files.engineering.com/getfile.aspx?folder=4df14950-4d2a-4a8a-a4f1-87db38949ed7&file=scanner@permatile.com_20240619_084501.pdf
https://files.engineering.com/getfile.aspx?folder=26f8f718-db00-40e0-9476-c4756411bc9e&file=RE__Call_me_(2).msg
I did a model of this on STAAD PRO and top corner of wall had high absolute compression stress just from...
Seth, Yes this was modeled with STAAD PRO and I have changed the boundary conditions and the model shows high stress on inside wall.https://files.engineering.com/getfile.aspx?folder=b3b7dc73-4000-4a2c-a8f3-b0f449c74f44&file=3942_001.pdf
These pictures are from a rigid frame bridge 54.5 feet span with 5 feet high walls and 45 degree skew and 31.5 feet wide. These cracks happened after all precast units had been set and only self weight is...
Mike,
fattdad answered the why of GEO 5 being higher than FLAC. I was answering his question So, what do you mean by, "Higher Pressures?" Also, I was curious if anyone had similar results and work around with GEO 5?
Thanks,
edward1
fattdad,
The pressures from GEO 5 FEM are higher than pressures from FLAC. These pressures from both programs that are higher than gamma*H are from shear forces from more settlement along exterior of culvert walls. See attached pdf?
edward1...
FLAC uses model of the soil that uses a hyperbolic relationship between stress and strain for the soil. GEO5 currently only has the capability of an elastic – perfectly plastic soil (Mohr-Coulomb).The current report highlights as well as some of the literature highlights the limitations of the...
Thanks bridgebuster and OSUCivilEng. I had meeting with DOT Bridge Dept and said I didn't think the 4 bolts barrier would transfer moment to the deck and they said that it would most certainly transfer moment to the deck. They said this must be analysed as extreme event using LRFD and also add...
I am using an approved DOT barrier and it is bolted to existing concrete deck slab. The question is do I need to use the AASHTO LRFD Bridge Design Specifications for 1/2 of existing bridge that is only there for 6 months?
I have been analyzing a reinforced concrete t-beam bridge to be replaced. Half of superstructure will be removed and other half will remain for 6 months while first half is replaced. Then this half will be replaced. This bridge was completed in 1951 with concrete strength 3 ksi and rebar Fy= 40...
These boxes are 7'span x 7' high and fill is from 50' to 310'. Isn't vertical pressure essentially gamma*height of fill? Lateral pressure is Ca*gamma*height of fill?
I am designing 3 single precast box culverts that will be placed side by side with variable gaps between them from 3" to 1'-7" depending on fill and varying wall thickness. The question asked by DOT engineers is would the lateral pressure be different on interior walls from exterior walls if the...
Jed, You are correct. It took me several 6 posts and I finally got the attachment on post 7 above. But the point of discussion from the shear stress models was from these models were they one way or two way (punch through) shear stress? I finally got an answer from Sye at Bentley that these 2...
The attached pdf shows SQX and SQY shear stress that are not continuous across the slabs like they are for box culverts with this much fill? I think this is closer to punch through stress versus one way stress?
