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...
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...
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...
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...
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...
When I model entire slab of concrete slab bridge using 4 node elements of Staadpro V8i, I get very high SQX stresses only at diagonally opposite edges. The other elements SQX are much lower. Is this due to edge curl of elements?
I have modeled about 40 simple reinforced concrete slab bridges using finite element software for a state dot and am now required to rate these on a two dimension program, Virtis, which defaultes to a swag formula that only uses span length and width for the live load distribution factor. It...
Supposedly, this specification has something to do with using epoxy coated wire mesh reinforcement instead of epoxy coated rebar for precast reinforced concrete box culverts with less than 2 feet of fill. Any guidance is appreciated?
I have modelled an 8' Dia. x 63' High precast concrete coal stacking tube using elements in Staadpro v8i. The wall thickness is 9.5". The model has loads which include selfweight, conveyor belt tensions, wind loads, asymmetrical coal pressure, head house dead & live load, and seismic loads. The...
I have modelled an 8' Dia. x 63' High coal stacking tube using elements in Staadpro 8vi. The wall thickness is 9.5" and is concrete. The model has loads which include selfweight, conveyor belt tensions, wind loads, asymmetrical coal pressure, head house dead & live load, and seismic loads. The...
Why would a state DOT bridge engineer demand at least 2 feet of select fill with asphalt on the brige approach if the contractor opts not to pour an approach slab? Is the 2 feet fill a rule of "That's the way we have always done it" or is does it have something to do with impact reduction?
I used BARS in the 1990's to rate several different type bridges. I have been asked to consider rating some of these same bridges using the system option of VIRTIS Bridge Rating Software. Has anyone used it to rate DOT bridges? How would you rate user friendlines of this program? How difficult...
I am looking for a computer program like CANDE to model soil structure interaction for earth fills of 50+ feet. This would be WINDOWS based and similar to SPIDA that was used to model soil pipe interaction.
In order to design concrete using LRFD and STAADPRO, I was thinking of using the appropriate resistance factors and dividing them into the appropriate load factors to get a new load factor to use with existing Load Factor Design of concrete that STAADPRO uses. Until Bentley incorporates LRFD for...
