Module "Compression perpendicular to grain"

The input is divided into:

• definitions of the cross section
• definitions of the plate dimensions
• input of the loads
• type of load configuration
• calculation options

An option for a quick control of the input data is offered by a graphical representation shown on the right side.

The plate is specified with its dimensions in x and y direction. The plate length is defined with dimension in x direction and the plate width with dimension in y direction.

In addition to plate dimensions, the analysis also considers the way the lamellas are joined into individual layers. Regarding to the joining of the outer layers, one should differ:

• side gluing of lamellas,
• assembly without adhesive where lamellas are placed side by side without the sheduled gaps or the expected occurence of cracks and
• possible occurence of gaps or cracks wider than 1 mm.

The applied force F_c,90 (design value) in [N], as well as the design factors can be specified here.

The load situation is described by specifying the load introduction above and below. Thereby, one can define if the load is even applied, and if so, if it is applied locally or continuously (over entire surface).

If the load is applied locally, it needs to be defined by entering the dimensions of the load surface (length l_1,2 in direction x and width w_1,2 in direction y) and the position. The position is defined as the distance between the center of a load surface and the origin of the coordinate system (lower left corner of the plate). Currently, centers of the top and the bottom load surface are coupled and cannot be moved relative to each other.

In the calculation options, the load distribution angles for longitudinal layers α₀ and cross layers α₉₀ can be changed, and for one-sided load introduction, it can be specified, in which depth (= k_ls ⋅ t_CLT) the effective area is to be determined.

Die minimale Lasteinleitungsfläche beschreibt die Bezugsfläche, um mit dem Querdruckbeiwert k_c,90 auf die effektive Fläche A_ef,max zu kommen. Bei unterschiedlichen Beanspruchungsflächen oben und unten ist es die Überschneidungsfläche der beiden Beanspruchungsflächen. Die effektive Fläche A_ef,max wird durch l_ef und w_ef in der Höhe z beschrieben.

Die Ausnutzung auf Querdruck wird durch den Ausnutzungsgrad η_c,90 in [%] angegeben.

In der folgenden Skizze wird der Verlauf der effektiven Fläche A_ef,max über die Querschnittshöhe (rote Linie) sowie der Verlauf der angenommenen Lastausbreitung (blaue Linie) angezeigt.

Compression perpendicular to grain - Verification

Model for the determination of the kc,90 factor