Module "CLT-Plate loaded in plane"
- Input data
- Results and Output
  - Cross section values
  - Summary of the results
Discussion

Module "CLT-Plate loaded in plane"

Input data

The input is divided into:

definitions of the cross section
specification of parameters concerning structural fire design
internal forces (design values)
definitions of design factors

Cross section

The input is the same as for the Module "CLT-Plate 1D - Continuous beam".

The cross section can be defined by the user or by choosing a typical cross section of a proprietary CLT product. There is also the possibility to save own CLT cross sections in a library. The elements are subdivided by the number of layers.

If a user-defined cross section is entered, the thickness and orientation of each layer can be changed. Furthermore, the material can be changed for all layers. The thickness of each layer has to be within the range of 6.0 mm to 45 mm. In the case of proprietary CLT products, the strength class of lumber and the orientation can be changed. If the orientation is changed, the whole cross section is rotated.

The width of the CLT plate strips can be also defined in this field. The default value is set to 1 m. The thickness of the CLT plate is calculated automatically based on the thickness of the single layers.

The ratio of board thickness to board width can also be changed here. The default setting is 1:4.

My CLT cross sections

By clicking the button the current cross section can be stored in the library and be retrieved by selecting "My CLT cross sections" later on.

The library can be displayed with the button .

The edit mode can be entered by clicking on . Currently, only the name of the stored cross section can be changed.
With the changes are saved.
With the chosen cross section in the sidebar can be removed from the library.
With cross sections from a csv file can be imported.
With the cross sections from the library can be exported to a csv file.

Syntax of the csv file

name;number of layers n;layer thickness in [m] t₁ to t_n;orientation of the layers o₁ to o_n (0 or 90);name of material

Example:
Test layup;5;0.03;0.02;0.02;0.02;0.03;90;0;90;0;90;GL24h*

My materials

With the button the material library can be displayed.

With the edit mode can be entered.
With the changes are saved.
With the chosen material in the sidebar can be removed from the library.
With materials from a csv file can be imported.
With the materials from the library can be exported to a csv file.

Syntax of the csv file

1. row: description of the parameters
2. row: units of the parameters
3. row: value
delimiter: ";"

Example:
Name;f_m,k;f_t,0,k;f_t,90,k;f_c,k;f_c,90,k;f_v,k;f_r,k;E_0;E_0,05;E_90;G;G_r;rho_k;rho_mean;f_v,k,IP;f_T,k;f_m,k,IP
;N/mm2;N/mm2;N/mm2;N/mm2;N/mm2;N/mm2;N/mm2;N/mm2;N/mm2;N/mm2;N/mm2;N/mm2;kg/m3;kg/m3;N/mm2;N/mm2;N/mm2
Mat 1;24;16.5;0.5;24;2.7;3;1.25;11600;9667;0;720;72;380;500;5.5;2.5;21

The user-defined materials are then displayed in the material selection list.

Optimization of layup

Use the button to display the window for layup optimization.

With the help of this tool, the possible layups can be determined for the given system and load situation. The optimization can be restricted with regard to producers, number of layers or by means of limits for the panel thickness. Furthermore, outer cross layers or double layers can be included or excluded. With the option "Vibration verification according to EN" the base document is included in the vibration check or not.

With the buttons "Start" and "Stop" the calculation is controlled. Please be patient, depending on the selected parameter the calculation may take a little longer.

The possible setups are then displayed in the table and the selected setup can be transferred to the main window by clicking the "Choose the selected cross section" button.

Cross section · 2017/11/14 17:11

In this module it is not possible to change the cross sectional width.

Fire

The input is the same as for the Module "CLT-Plate 1D - Continuous beam".

Show description

Fire left / right instead of fire above and below.

Internal forces and design factors

In the tab „internal forces, stresses and utilization ratio“ it is possible to define the shear force in plane per unit length n_xy,d, as well as the design factors. The design method is based on a board width which is chosen when defining the cross section.

Results and Output

Cross section values

The effective stiffnesses of a plate loaded in plane are given in the tab "cross section values" for the full cross section and in case of structural fire design for the charred cross section.

The small differences between the extensional stiffnesses D_x and D_y and the effective extensional stiffness EA_ef in the module CLT-Plate 1D result from the negligence of the extensional stiffness of the cross layers in this module.

Summary of the results

The calculated substituted thicknesses, stresses as well as utilization ratios of the two mechanisms (Mechanism I – shear and Mechanism II – torsion) are given in the tab "internal forces, stresses and utilization ratios".

Furthermore, the utilization ratios, that were calculated based on ETA-08/242 [1] and ETA-09/0036 [2] are given.

[1] ↑ Europäische Technische Zulassung ETA-08/0242: HMS - Element. Berlin. 11.03.2009. gültig bis 10.03.2014.

[2] ↑ Europäische Technische Zulassung ETA-09/0036: MM - BSP. Wien. 23.03.2009. gültig bis 22.03.2014.

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