Combined walls

This module is relevant when the wind load is distributed according to the stiffness (EN 1996 - 1 - 1, 6.3.1 (6))

For a wall without openings:

• the horizontal load and the moment at the top is distributed between the outer and inner leaf
• forces in the wall-ties is determined

Moments from windload and eccentricity in top are distributed according to the stiffness of the leafs.

The (wind)pressure in the cavity itself is pressumed nil.

 

Material in the inner leaf

Relevant for deducting the stiffness

 

Vertical distance between rows of wall-ties

The vertical distance must be equal to an integer number of courses. Normally the distances are determined by the available dimensions of insulation

 

Horizontal distance between wall-ties in a standard row

Minimum value of 4 wall-ties pr square meters has been chosen. This demand can be fulfilled using e.g. following combinations of horizontal and vertical distances: 1250 mm x 200 mm, 500 mm x 500 mm

 

Horizontal distance between wall-ties in the top row

This distance is normally smaller than the distance in a normal row, due to the reduced capacity and the reaction to be transferred to the inner leaf

 

Module of elasticity for the inner leaf

The value is transferred automatically from:

• from the heading "Masonry" if inner leaf is marked as "masonry" on the heading "Common data"
• from the heading "LW Concrete (EN 12602)" if inner leaf is marked as such on the heading "Common data"

The value can of course be changed by the end-user

 

Module of elasticity for the outer leaf

The value is transferred automatically from the heading "Masonry"

The value can of course be changed by the end-user

 

Topeccentricity e₀

e₀ is the eccentricity in top of the wall, positive to the right. The users determine the total eccentricity in case the vertical loads consist of several contributions.

 

Height

If the wall is placed on a slab or a foundation, the height is measured from the top of the slab or foundation.

If the wall is horizontal supported by a floor component, resting on the upper side of the wall, the design value of the height is measured to the lower side of the floor component.

 

Vertical load on the inner leaf

The design value of the vertical load is the sum of the design values of the loads from the floor components, storeys, etc. above, directly influencing the wall.

 

Is the wall supported along vertical edges?

This information is only relevant for the print-out in connection with the deflection. When vertical supported the deflection of the wall is smaller than calculated due to the assumption of support only in top and bottom.

  

Thickness of the inner or outer leaf

Rules in the N.A. for minimum thickness of walls shall be applied

The value is transferred through the heading "Masonry". The value can be overwritten.

 

Horizontal load on the inner leaf

Part of the total horizontal load directly subjected to the inner leaf

 

Horizontal load on the outer leaf

Part of the total horizontal load directly subjected to the outer leaf

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