In Advance Design, the calculation of timber linear elements typically follows global timber design assumptions based on the current standards. For more precise control and customization, you have the option to define local timber assumptions for each individual element.
This customization is accessible through the properties window, where you can select Timber Properties from the Properties filter dropdown to focus exclusively on the timber design properties of your selected element(s).
Properties window
In the properties window, you can view and modify the properties of timber linear elements, allowing for detailed customization and management.
Clipping: enables the clipping of forces option.
Extremity: defines the clipping distance for the element extremities. The distance can be automatically calculated by the program or manually defined by the user.
XY plane: defines if the clipping distance in XY plane is automatically calculated or user defined.
Value: displays the automatic clipping value for the XY plane. If the user-defined option is enabled, a custom value can be entered.
XZ plane: defines if the clipping distance in XZ plane is automatically calculated or user defined.
Value: displays the automatic clipping value for the XZ plane. If the user-defined option is enabled, a custom value can be entered.
To calculate: when this option is enabled, the element is taken into account at the timber calculation. When disabled, the concerned elements are not calculated.
Design results: Displaying maximum working Ratio value of all design verifications executed inside Advance Design for this element.
Work Ratio: Displaying maximum working Ratio value of all design verifications executed inside Advance Design for this element.
General Design Template: you can assign a design template that defines the element design properties. Select one of the available templates from the drop-down list.
Service class: defines the service class for the element which is taken into account at the timber calculation. Service class is determined according to the environmental conditions.
Humidity percentage: defines the humidity percentage of the surrounding air.
Systems effect coefficient Ksys: the member strength properties can be multiplied by a group effect factor (ksys), when several elements with the same function are laterally connected by a continuous load distribution system.
Fire exposure time: time (in minutes) of fire exposure
Delay of burning: delay of burning due to protection (in minutes)
Resistance of planking (min): resistance of planking (in minutes)
k2: insulation coefficient [m/min]
k3: post-protection coefficient [m/min]
Exposed faces: displays the Fire design dialog box, where the user can specify which element faces are exposed to fire.
Elem. verification: Enables / disables the deflection verification of the element.
Deflections: Defines the constructive and the allowable deflections.
Constructive defl. Wc: constructive deflection (if applied)
Allowable defl. Winst: instantaneous deflection due to Q loads only
Allowable defl. Wnet,fin: effective final deflection
Allowable defl. Wfin: final deflection without considering Wc
Verif. location: select from the drop-down list the location on the element for which the deflection are verified (extremity, span, envelope).
Super Elem. Verification: Take into account the super element at deflection verification
Super elem. Deflections:
Constructive defl. Wc: constructive deflection (if applied)
Allowable defl. Winst: instantaneous deflection due to Q loads only
Allowable defl. Wnet,fin: effective final deflection
Allowable defl. Wfin: final deflection without considering Wc
Verif. location: select from the drop-down list the location on the element for which the deflection are verified (extremity, span, envelope).
Elem. verification: Enables / disables the buckling verification of the element.
Buckling length: allows the definition of buckling lengths for the selected element. In the corresponding cell, click to access the Buckling configuration dialog box.
Buckling dialog
Shape subject to buckling: specifies if the element is subject to buckling or not. If not, the reduction factors (i.e., min, ky and kz) are not calculated and are considered equal to 1.
xz plane - large inertia and xy plane - small inertia: define the calculation mode of the buckling lengths for the xy and xz plane of the selected timber element.
L0: length of the element to the next point of support in the plane buckling.
Lfz, Lfy: buckling length about the local y and z axes, associated to the Iz / Iy inertia.
Auto calculation: calculates the buckling using the method specified in the Timber design settings dialog box.
Imposed value: calculates the buckling lengths by a value entered in the corresponding field.
Super-element ratio: calculates the buckling lengths by a specified value multiplied by the super-element length.
Element ratio: calculates the buckling lengths by a specified value multiplied by the element length.
Mesh size ratio: calculates the buckling lengths by a specified value multiplied by the mesh size.
Lfz fire and Lfy fire: define the buckling length for fire verification about z and y local axes.
= Lf: the buckling length for fire verification is equal to the buckling length (Lfz or Lfy).
Imposed value: calculates the buckling lengths for fire verification by a value entered in the corresponding field.
Super-element ratio: calculates the buckling lengths for fire verification by a specified value multiplied by the super-element length.
Mesh size ratio: calculates the buckling lengths for fire verification by a specified value multiplied by the mesh length.
Fixed Lf: calculates the buckling lengths for fire verification by a specified value multiplied by the buckling length (Lfz or Lfy).
The blue highlighted fields display the calculated buckling lengths, Lfz and Lfy, when the timber calculation is completed.
Elem. verification: when enabled, the element will be taken into account at buckling verification.
Lateral-torsional Buckling: click to access the Lateral-torsional buckling dialog box, where you can configure the lateral-torsional buckling length calculation.
By using local timber assumptions, engineers can ensure that each element's design is optimized for its specific role within the structure, improving both performance and compliance.