Earth pressure¶
Soil properties¶
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class
actions.earth_pressure.earth_pressure.EarthPressureBase(zGround, gammaSoil)¶ Bases:
actions.earth_pressure.earth_pressure.PressureModelBaseParameters to define a load of type earth pressure
Variables: - zGround – global Z coordinate of ground level
- gammaSoil – weight density of soil
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class
actions.earth_pressure.earth_pressure.EarthPressureModel(K, zGround, gammaSoil, zWater, gammaWater)¶ Bases:
actions.earth_pressure.earth_pressure.EarthPressureBaseParameters to define a load of type earth pressure
Variables: - K – coefficient of pressure
- zWater – global Z coordinate of groundwater level (if zGroundwater<minimum z of model => there is no groundwater)
- gammaWater – weight density of water
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getPressure(z)¶ Return the earth pressure acting on the points at global coordinate z.
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class
actions.earth_pressure.earth_pressure.HorizontalLoadOnBackfill(soilIntFi, qLoad, zLoad, distWall, widthLoadArea, lengthLoadArea=1, horDistrAngle=0)¶ Bases:
actions.earth_pressure.earth_pressure.PressureModelBaseLateral earth pressure on a retaining wall due to a surcharge load acting in horizontal direction on the backfill.
Variables: - soilIntFi – agle of internal friction of the soil (º)
- qLoad – surcharge load (force per unit length)
- zLoad – global Z coordinate where the line load acts
- distWall – minimal horizontal distance between the wall and the area where the surcharge load acts (e.g.: a foundation)
- widthLoadArea – width (perperdicular to wall) of the area on which the horizontal load acts (e.g.: a foundation).
- lengthLoadArea – width (parallel to wall) of the area on which the horizontal load acts (e.g.: a foundation). We can take lengthLoadArea=1 (default) for a continous load
- horDistrAngle – angle to distribute load in the direction of the lengthLoadArea (defaults to 0 to apply all the load to a length of wall =lengthLoadArea, which would be the case of a continous load)
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appendLoadToCurrentLoadPattern(xcSet, vDir, iCoo=2, delta=0.0)¶ Append to the current load pattern the earth thrust on a set of elements due to the horizontal load.
Parameters: - xcSet – set that contains the elements (shells and/or beams)
- vDir – unit xc vector defining pressures direction
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getMaxMagnitude()¶ Return the maximum magnitude of the vector loads
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getPressure(z)¶ Return the earth pressure acting on the points at global coordinate z
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setup()¶ Calculate basic parameters
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class
actions.earth_pressure.earth_pressure.LineVerticalLoadOnBackfill(qLoad, zLoad, distWall)¶ Bases:
actions.earth_pressure.earth_pressure.PressureModelBaseLateral earth pressure on a retaining wall due to line surcharge load acting in vertical direction on the backfill. (J.Calavera, pg.41)
Variables: - qLoad – surcharge load (force per unit length)
- zLoad – global Z coordinate where the line load acts
- distWall – horizontal distance between the wall and the line surcharge load
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getMaxMagnitude(xcSet)¶ Return an estimation of the maximum magnitude of the vector loads (it’s supposed to occur in a point placed 1/3L from the top)
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getPressure(z)¶ Return the earth pressure acting on the points at global coordinate z
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class
actions.earth_pressure.earth_pressure.MononobeOkabePressureDistribution(zGround, gamma_soil, H, kv, kh, psi, phi, delta_ad, beta, Kas)¶ Bases:
actions.earth_pressure.earth_pressure.EarthPressureBaseOverpressure due to seismic action according to Mononobe-Okabe
Variables: - H – height of the structure.
- kv – seismic coefficient of vertical acceleration.
- kh – seismic coefficient of horizontal acceleration.
- psi – back face inclination of the structure (< PI/2)
- phi – angle of internal friction of soil.
- delta_ad – angle of friction soil - structure.
- beta – slope inclination of backfill.
- Kas – static earth pressure coefficient
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getPressure(z)¶ Return the earth pressure acting on the points at global coordinate z
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update()¶
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class
actions.earth_pressure.earth_pressure.PeckPressureEnvelope(phi, zGround, gammaSoil, zWater, gammaWater, H)¶ Bases:
actions.earth_pressure.earth_pressure.EarthPressureModel- Envelope of apparent lateral pressure diagrams for design
- of cuts in sand. See 10.2 in the book “Principles of Foundation Engineering” from Braja M. Das.
Variables: - H – height of the cut.
- phi – effective friction angle of sand.
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getPressure(z)¶ Return the earth pressure acting on the points at global coordinate z.
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class
actions.earth_pressure.earth_pressure.PressureModelBase¶ Bases:
objectBasse class for objects defining earth pressures.
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appendLoadToCurrentLoadPattern(xcSet, vDir, iCoo=2, delta=0.0)¶ Append earth thrust on a set of elements to the current load pattern.
Parameters: - xcSet – set that contains the elements (shells and/or beams)
- vDir – unit xc vector defining pressures direction
- iCoo – index of the coordinate that represents depth.
- delta – soil-wall friction angle (usually: delta= 2/3*Phi).
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getPressure(z)¶ Return the earth pressure acting on the points at global coordinate z.
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class
actions.earth_pressure.earth_pressure.StripLoadOnBackfill(qLoad, zLoad, distWall, stripWidth)¶ Bases:
actions.earth_pressure.earth_pressure.UniformLoadOnStemLateral earth pressure on a retaining wall due to a strip surcharge load on the backfill. (J.Calavera, pg.40)
Variables: - zLoad – global Z coordinate where the surcharge load acts
- distWall – minimal horizontal distance between the wall and the surcharge load
- stripWidth – width of the strip
- coef – is a coefficient = 1.5 (default) for the usual case of non-rigid walls. It can be redefined =2 for rigid walls
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appendVerticalLoadToCurrentLoadPattern(xcSet, vDir, iXCoo=0, iZCoo=2, alph=0.5235987755982988)¶ - Append to the current load pattern the vertical pressures on
- a set of elements due to the strip load. According to 11.3.4 in the book “Mecánica de suelos” of Llano, J.J.S. isbn= 9788471461650 (https://books.google.ch/books?id=oQFZRKlix_EC)
Parameters: - xcSet – set that contains the elements.
- vDir – unit xc vector defining pressures direction
- alph – angle of stress spreading.
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getMaxMagnitude(xcSet)¶ Return an estimation of the maximum magnitude of the vector loads (it’s supposed to occur in a point placed 1/3L from the top)
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getPressure(z)¶ Return the earth pressure acting on the points at global coordinate z
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class
actions.earth_pressure.earth_pressure.UniformLoadOnBackfill(K, qLoad)¶ Bases:
actions.earth_pressure.earth_pressure.UniformLoadOnStem- Lateral earth pressure on a retaining wall due to a uniform indefinite
- load on the backfill.
Variables: qLoad – surcharge load (force per unit area) -
getPressure(z)¶ Return the earth pressure acting on the points at global coordinate z.
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class
actions.earth_pressure.earth_pressure.UniformLoadOnStem(qLoad)¶ Bases:
actions.earth_pressure.earth_pressure.PressureModelBaseUniform lateral earth pressure on a retaining wall.
Variables: qLoad – surcharge load (force per unit area) -
getPressure(z)¶ Return the earth pressure acting on the points at global coordinate z.
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