When BAEL 91 - France standard is the reinforced concrete standard selected for the current project, the Calculation Settings dialog box allows the definition of the concrete calculation settings.
Main menu: select Settings > Reinforced Concrete Design > Design Settings.
Ribbon > Analysis tab > RC Design panel > Settings.
Calculation Settings - BAEL 91 - France standard
This tab defines the reinforced concrete calculation settings.
Standard settings
Planar elements calculation method
Defines the reinforcement calculation method for the planar elements:
Auto: the concrete calculation engine uses the Wood method while the planar elements are solicited by normal compression forces inferior to 10 N.
Note
If the membrane forces are null or irrelevant, the Wood method is used. This calculation procedure allows the evaluation of bending moments starting from Mx, My and Mxy to determine the sections of each reinforcement level. If the membrane forces are significant, the Capra method is used because it takes into account the tension and compression membrane forces. The Capra method is also used in case of combined tension, because the Wood method extension considering the membrane forces leads to exceeded reinforcement when the shell is subjected to compression.
Wood: when the normal forces acting on planar elements are inferior to 10 N.
Capra: when the normal forces acting on planar elements are superior to 10 N.
Baumann: The objective of the method is to reduce a bending or composed bending problem in the pure normal forces problem by dividing the plate thickness in N layers with the same thickness and calculating the normal force in each layer. The method starts with the internal forces in the main directions: N1 and N2 for the normal forces, M1 and M2 for the bending moments. Then, it makes the projection of the local axes of the reinforcement calculation. From these projected internal forces, the Sxx, Syy and Sxy stresses are obtained. Considering a linear gradient, the stresses at each layer border are calculated, and then the corresponding axial forces and the lever arm “z” to the mid plane are calculated. After that, for each layer, the steel tension forces (Nu and Nv) and the concrete compression force (Nw) are calculated.
Number of samples for Capra: The number of divisions for the θ angle used for Capra method.
Forces taken into account for planar elements
Defines the type of forces which are considered (smoothed or not smoothed) at the reinforcement calculation.
Calculation of reinforcement bars: Defines the coordinate system in which the forces are expressed.
Bending beams calculation method
Defines the bending calculation method (Limit or Critical).
BAEL Specific
Specifies if Addendum 99 of BAEL is taken into account.
Beam calculation - Number of bars
Number of bars
Sets the numbers of bars if the cross-section width is enclosed between certain limits.
Width (m) >=: Select the minimum width of the cross-section.
Width (m) <: Select the maximum width of the cross-section.
Number of bars per layer: Select the number of bars per layer.
Imposed number of bars: Input an imposed number of bars.
Max diameter
Beam calculation - Max diameter
Width (m) >=: Select the minimum width of the cross-section.
Width (m) <: Select the maximum width of the cross-section.
Max diameter: Select the maximum diameter.
Number of layers
Beam calculation - Number of layers
Height (m) >=: Select the minimum height of the cross-section.
Height (m) <: Select the maximum height of the cross-section.
Number of layers: Select the number of layers.
Override number of layers: Specify if you want to override the number of layers.
Calculation method
Columns calculation with specific methods: Enables / disables the calculation of columns reinforcement during the reinforced concrete design.
Specific
Automatic calculation: Specifies if the columns calculation method is automatically determined by the program.
Calculation method
Allows the selection of the calculation method (when the Automatic calculation is disabled):
Simplified method
Substitute method
Iterative method
Longitudinal reinforcement bars
Reinforcement bar: Defines the incremental area used for the iterative method.
Increase of: Defines the reinforcement bars increase percent when the simplified method is used and the external forces include an oblique bending.
dx and dy parameters correspond to the size of mesh elements along x and y axes of the cross section at the calculation of interaction curves.
Eccentricity ratio: Available only for the substitute and iterative methods, refers to the composed biaxial bending "Perchat" method:
when enabled, the normal force and the concrete strength will be distributed according to the eccentricity ratio.
when disabled, the normal force and the concrete strength will be distributed according to the cross sections dimensions ratio. This option is recommended when the column is subject to very weak bending moments in one of the two directions.
Loads application date
Defines the date when the loads are applied on the structure:
More than 50% loads applied before 90 days.
Majority of the loads applied before 28 days.
Another case.
Note
The 'a' coefficient, depending on column slenderness, is reduced if most of the loads are applied before 90 days and before 28 days. In the general case when the loads are applied after 90 days, the concrete strength is increased.
This tab defines the type of structure for the buckling lengths calculation by Ka Kb coefficients. For xy and xz planes it can be specified if the structure has braced or unbraced nodes. If these options are disabled, there is no specification for the structure's stability and the buckling lengths are calculated by the local parameters of each element. You can enable thw option to detect super elements for automatic buckling lengths.
Columns calculation - Buckling
Note
The settings made in this tab do not affect the elements whose properties are defined by design templates. In this case, the element design properties are linked to the corresponding template.
This tab contains the list of reinforcements from which the concrete expert may suggest at the end of the concrete calculation. Only the selected reinforcements are considered in the concrete design calculation.
Reinforcement
Use the selection boxes from the Longitudinal / Transversal columns to specify the reinforcements to consider.
You can also use the All / None options to select or unselect all the available options.
This tab contains the list of available reinforcement meshes.
Fabrics
S (mm2/m): reinforcement area of the main wires;
s (mm2/m): reinforcement area of the secondary wires;
E (m): distance between the main mesh wires;
e (m): distance between the secondary mesh wires;
D (mm): diameter of the main mesh wires;
d (mm): diameter of the secondary mesh wires;
L (m): length of the reinforcement mesh;
l (m): width of the reinforcement mesh;
m (kg/m2): weight per m2.
This tab defines the verifications to perform during the reinforced concrete calculation.
Calculation sequence
Verify: Verifies the concrete elements errors (modeling errors).
Calculate: Enables the calculation of concrete elements.
Verify columns with interaction curves: After the columns calculation, this command performs a verification of vertical linear elements, making sure that the force component is inside the interaction area. If not, it will generate a list of errors for the column elements with the force component outside the interaction area.