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Saturday, August 18, 2018

Aspects of Modelling of Shear Walls

Shear walls are structural elements usually employed in tall buildings to assist in resisting lateral loads. Shear walls can be solid or pierced (coupled), depending on their location in the building. In the design of  tall buildings, structural engineers normally throw the entire lateral load (say wind action) to the shear walls, which means that the columns will not be relied on for lateral stability. In a more practical scenario however, the shear walls and columns interact in resisting lateral loads, which can be taken into account.



In this post, we are going to review how shear walls can be modelled on Staad Pro software and consider the various accuracy levels with each method.

Let us consider the shear wall shown below;


Thickness of the wall = 250 mm
The wall is subjected to a lateral load of 300 kN at the top.

Model 1: Equivalent frame model
In this model, we represent the shear wall as an equivalent frame with representative stiffness for the various elements.

On modelling this Staad Pro, we obtained the result shown below;

The maximum horizontal deflection was obtained to be 158.376 mm.




Model 2: Plate modelling (Finite Element Mesh)

In this model, the shear wall is modelled as a full plate with approximate mesh size of (4 x 4) per square metre. The deflection due to the lateral load is given below;


The maximum horizontal deflection was obtained to be 156.588 mm.

It is important also to compare the deflection obtained by considering different mesh sizes in order to compare the accuracy of utilizing the equivalent frame model. Thank you for visiting Structville today, and God bless.


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