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  • Users: edward1
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  1. edward1

    Pipecar output for design

    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
  2. edward1

    I have a design for 60" inside rein

    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
  3. edward1

    Cracks at top of inside wall of precast rigid frame bridge

    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...
  4. edward1

    Cracks in Rigid Frame Bridge Wall

    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...
  5. edward1

    310 feet of 137.5 pcf soil embankment on precast concrete box culverts

    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...
  6. edward1

    Extreme event on temporary barrier traffic control

    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...
  7. edward1

    3 Single Precast Box Culverts

    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...
  8. edward1

    One Way or Two Way shear stress

    Attached are the post results of shear stresses SQX and SQY of reinforced concrete tank with 36.33' of fill.
  9. edward1

    AASHTO LRFD shear analysis of slabs and footings

    The differences of aashto lrfd 5.13.3.6.3-1 & 5.13.3.6.3-2 are transverse reinforcement? Does this mean lateral stirrup reinforcement
  10. edward1

    AASHTO Inventory and Operating Rating values

    What are these two number values expected to be normal?
  11. edward1

    SQX only at diagonally opposite of edges of concrete slab bridges high

    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?
  12. edward1

    Determine Live Load Distribution Factor from Finite Element Analysis

    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...
  13. edward1

    AASHTO M273-11 Table 2

    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?
  14. edward1

    Cylindrical Precast Concrete Coal Stacking Tube

    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...
  15. edward1

    Concrete Cylindrical Coal Stacking Tube

    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...
  16. edward1

    2' Select Fill with asphalt versus Approach Slab

    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?
  17. edward1

    t-wall retaining wall system

    I am attempting hand calcs of the t-wall system to confirm the stability of a design. Anyone seen a textbook type analysis of this?
  18. edward1

    Anyone has experience using VIRTIS software?

    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...
  19. edward1

    Soil Structure Computer Program?

    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.
  20. edward1

    Using STAADPRO for LRFD Concrete Design

    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...

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