BWA – Basement Wall - · PDF filewith the permissible soil pressure as per DIN 1054....
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Transcript of BWA – Basement Wall - · PDF filewith the permissible soil pressure as per DIN 1054....
BWA
FRILO Software GmbH Page 3
BWA – Basement Wall
Contents
Application options 4
Basis of calculation 4
Definition of the structural system and the loads 5
Earth pressure settings for a single layer 7
Soil layers 8
Water and slope 8
Additional loads 9
Output 10
Basement Wall
Page 4 Software for structural calculation and design
Application options
The BWA application allows the design of basement walls of reinforced concrete that can bear vertical top loads and moments as well as earth pressure on one side.
The software calculates the existing soil pressure as per DIN 1054 and proposes the dimensions of the foundations if the user selects this calculation.
If the Strip Foundation application FDS is installed on your computer, BWA puts the bending and shear design out in addition.
Available standards
DIN EN 1992
ÖNORM EN 1992
BS EN 1992
EN 1992
DIN 1045/DIN 1045-1
ÖNorm B4700
Foundation engineering standards
DIN 1054
DIN EN 1997-1 in combination with DIN 1054:2010
Structural system
Ceiling - wall - foundation
The support of the ceiling can be either pinned or partially or fully restrained
Concentrated loads applying to the wall head and the inner foundation border
Concentrated moments applying at the wall head
Top load on the ground
Slope
Block loads
Soil layers
Water
Basis of calculation
The basement wall is considered as a vertical member with a pinned or restrained top and a base restrained between two bedded members simulating the foundation.
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Definition of the structural system and the loads
Available standards
First select the desired standards in the main menu.
Structural system
Material selection the concrete qualities and reinforcing steel grades can be selected via selection lists. The available options depend on the selected standard. Click on to expand the corresponding list.
Reinforcement layers di = interior reinforcement layer, de = exterior reinforcement layer
Wall wall dimensions, dw = wall thickness, hW = wall height
Foundation overhang interior/exterior foundation overhang, d = foundation thickness
Permissible soil pressure permissible soil pressure sigma in accordance with DIN 1054
Basement Wall
Page 6 Software for structural calculation and design
Loads
Head moment Mg = permanent head moment, Mp = live head moment
Head load G = permanent head load, P = live head load, e = eccentricity of the head loads (positive to the right)
Concentrated loads on the interior foundation border
Gi = concentrated load (permanent) applying to the interior foundation border
Pi = concentrated load (live) applying to the interior foundation border Soil pressure indication of the soil pressure as per DIN 1054
Increase overhangs the overhangs can be increased on the interior and exterior to comply with the permissible soil pressure.
Reset this function allows you to reset the options available for selection in the dialog ‘Increase overhangs’ (front, rear or both) by deleting the previous options.
Optimize this function determines the most favourable combination of dimensions for the front and rear overhangs of the foundation to ensure compliance with the permissible soil pressure as per DIN 1054.
Ceiling options to specify
- Material (concrete, other material via the modulus of elasticity), - Dimensions (L1, dp), - Supports for the ceiling Degree of restraint of the remote ceiling support: 4 ... fully restraint 3 ... pinned 0 ... free wall head (no ceiling)
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Earth pressure settings for a single layer
If only a single soil layer is in contact with the wall, you can enter the soil parameters in this simplified dialog (accessible via the button “Earth pressure”). After you have specified whether kah, k0 or the average of both shall be considered for the calculation, the software determines automatically the earth pressure ordinates.
Alternatively, you can define the ordinates by entering the values.
Basement Wall
Page 8 Software for structural calculation and design
Soil layers
Accessible via the option “Soil layers” in the main menu.
Specify soil pressure coefficients: allows you to decide whether the earth pressure coefficient should be calculated from the soil parameters or whether you would like to specify the coefficients (kah, kph) by entering the values.
For each layer, you need to define the layer thickness as well as the soil characteristics such as gamma (), the angle of inner friction Phi () and the cohesion c.
The individual layers must have a minimum thickness of 0.25 m. The number of layers is limited to 21.
Water and slope
Accessible via the item “Water & slope” in the main menu.
If groundwater exists in the area behind the wall, you must define a layer border at the height of the ground water level and specify gamma’ instead of gamma.
The value specified for the water level in front of/behind the wall refers to the distance from the top edge of the wall.
The slope is determined by the distance of the top of the slope to the wall head and by the length and the height of the slope.
For a continuous slope beginning at the wall head, enter the slope angle (beta).
The slope angle must not be greater than of the uppermost layer. If you need to take a steeper slope into account, define an additional first soil layer with a corresponding > .
After you have defined the slope parameters, the software calculates the inclination angle and displays it.
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Additional loads
Block loads are defined via their distance to the wall, their length L1 perpendicular to the wall, their length L2 parallel to the wall as well as their height level (depth).
The height level value (depth) is positive when the block load applies below the wall head (and negative if it applies above).
For unlimited loads parallel to the wall (driving lane, strip foundation), you should enter the value "-1" for the length.
For loads applying parallel to the wall, the verification of the wall is performed in the symmetry plane of the block load.
Unlimited top load: you can define a top load q [kN/m²] that is unlimited on one side.
Basement Wall
Page 10 Software for structural calculation and design
Output
Output of system data, results and graphics on the screen or the printer.
The item ‘Output’ in the main menu allows you to start the output on a printer or the screen.
Word if installed on your computer, the text editor MS Word is launched and the output data are transferred. You can edit the data in Word as required.
Screen displays the data in a text window on the screen
Print starts the output on the printer
See the document FDC - Output and printing_eng.pdf
You can display a print view via the menu itemFilePage view
