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AutoPIPE Wiki 02c. Model Soil Properties with Soil Calculator and Underground Piping in AutoPIPE
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          • +01a. Model Different Types of PIPING in AutoPIPE
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          • -02c. Model Soil Properties with Soil Calculator and Underground Piping in AutoPIPE
            • A.01. What will be the yield displacement value for following in AutoPIPE?
            • A.02. Cannot validate AutoPIPEs results, specifically for the Qu term (vertical up) for sand, what is causing the difference?
            • A.03. In the Virtual Anchor Length equation (La = Co * Lm), how can the value for Co be adjusted in AutoPIPE?
            • A.04. Do we have to define the soil properties after the La (i.e., in Zone 3)?
            • A.05. What effect does the "Outside diameter" and "Depth to Centerline" have on soil properties when calculation method = User?
            • A.07. How to account for the weight of soil acting down on the pipe in AutoPIPE?
            • A.08. How to calculate the soil properties for a buried pipe on a 45 deg angled slope when using AutoPIPE?
            • B.01. Soil Overburden and Seismic Wave Propagation in AutoPIPE
            • B.02. Soil Overburden : The program does not retain the entered inputs for the Soil Overburden Categories menu in an AutoPIPE model, why?
            • C.01. Would it be appropriate to design fault line crossings by applying an offset to the pipeline being modeled in AutoPIPE
            • C.02. How to model a 420 km long buried pipe, including traffic loads and large radius bends in order for the pipe to travel under a river in AutoPIPE?
            • C.03. How to model horizontal buried piping going under roadways / railways?
            • C.04. How to model vertical Air Shafts - large diameter vertical underground piping in AutoPIPE?
            • C.05. Why does adding a node point change the soil settlement displacement in AutoPIPE?
            • C.06. Alternative of performing buried piping analysis by using DeltaT equivalent in AutoPIPE
            • C.07. Using AutoPIPE to determine pipe length needed for underground design
            • C.08. Can AutoPIPE model the stress on pulling a pipe into a directional drilled hole?
            • C.09. Why when modeling a little more weight does the results increase exponentially to become severally over-stressed in AutoPIPE's code compliance report?
            • C.10. When the pipe is in the fully restrained condition does the program make the necessary corrections for this condition?
            • C.11. How to model underground piping above / below the frost line with AutoPIPE?
            • D-01 What reference was used to set the default values Seismic Wave Data dialog in AutoPIPE?
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    02c. Model Soil Properties with Soil Calculator and Underground Piping in AutoPIPE

    Attention: Please see the following AutoPIPE help sections:

    Help > Contents> Contents Tab>

    1. Reference Information> Pipe Soil

    This section will provide information on

    a. Model Discretization

    b. Defining Soil Points in AutoPIPE

    c. Soil Restraint Properties in AutoPIPE

    d. Calculation of Soil Restraint Properties - AutoPIPE Method

    e. Calculation of Soil Restraint Properties - ASCE Method

    f. Calculation of Soil Restraint Properties - PRCI Method

    g. Comparison of Soil Restraint Properties

    h. Soil overburden stresses application on AutoPIPE points

     2. Modeling Approaches> Example systems> PIPE-SOIL Interaction: Transition Example.

    The purpose of the following example system is to demonstrate the procedure required to

    a. Calculate soil properties using AutoPIPE and ASCE method

    b. Verification of values with hand calculations

    c. Determine the location of critical piping points to be defined for the above to below ground (transition) piping system shown in the Figure below.

    In this example, the piping system is subjected to a temperature rise of 230°F, and an internal pressure of 100 psi. For simplicity, a single soil will be assumed to interface with the pipe over the entire length of the buried portion of the system.

    This online help section will provide step by step procedure of modeling soil properties in AutoPIPE.

    3. Procedure described in AutoPIPE Workbook was developed by SSD for piping systems and pipelines who also help write ASCE “Guidelines for the design of buried steel pipe”.

    4. Soil parameters Definitions

    k1 – soil stiffness value at yield displacement of the soil (lb/in/ft) –  notice as this value decreases, the Yield Displacement will increase – Yield Disp. = p1 / k1

    p1 – maximum soil resistance per unit length of pipe

    k2 – stiffness of soil after yield has occurred (conservative to assume a small value)

    Comments, Questions, and Answers about Soil Properties, Soil Calculator, and Underground Piping:

    A. Pipe Soil Calculator issues:

    1: Yield displacement value

    2: Difference between AutoPIPE and hand calculations related to Qu term (vertical up) for sand, why?

    3: In the Virtual Anchor Length equation, can the value for Co be adjusted?

    4: Define soil properties after the node point La (i.e., in Zone 3)?

    5: "Outside diameter" and "Depth to Center-line" affect on soil properties calculation when method = User

    6: Calculate slippage length and virtual anchor length

    7: Account for the weight of the soil acting down on the pipe

    8: Calculate soil properties for a buried pipe on a 45 deg angled slope

    B. Soil Over Burden issues & Buried Pipe Result Options:

    Note: 

    1. These dialogs are only available for the following piping code years:

    a. B31.1-2004 or higher
    b. ASME B31.4 Liquid Trans. 2004 or higher when ASME CC N-755-1 (HDPE) option was enabled.
    c. ASME B31.8 Gas Trans. & Dist 2004 or higher when ASME CC N-755-1 (HDPE) option was enabled.
    d. ASME NC 2004 or higher
    d. ASME NC 2004 or higher .

    2. See AutoPIPE help for reference to Adams et. al.

    1: Soil Overburden and Seismic Wave Propagation in AutoPIPE

    2: Soil Overburden : dialog does not retain the entered inputs for the Soil Overburden Categories, why?

    C. General Soil / Pipe issues:

    1:  Fault line crossings

    2: Long underground pipeline with traffic loading and large radius bend

    3: Horizontal buried piping going under roadways / railways

    4: Vertical Air Shafts or large diameter vertical underground piping

    5: Node point on segment with soil settlement already defined make a big difference in the results

    6: Alternative of performing buried piping analysis by using DeltaT equivalent

    7: Determine pipe length needed for underground design

    8: Stress on pulling a pipe into a directional drilled hole

    9: Little more weight the results increase exponentially to become severally over-stressed, why?

    10: Fully restrained piping, does the program make the necessary corrections for this condition?

    11: Underground piping above / below the frost line

    D. Seismic Wave Data issues:

    1: Seismic Wave Data reference for default values

    See Also

    Modeling Approaches

    Bentley AutoPIPE

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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Fri, Sep 6 2013 11:33 AM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Fri, Sep 4 2020 10:25 AM
    • Revisions: 61
    • Comments: 0
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