Knowing the methods for calculating the column catchment area is important when calculating the axial loads on the column. For manual calculations, the catchment area is the key factor in calculating column loads.
When calculating the loads on the vertical member, we consider the pillar capture method, but it is not limited to pillars only. Axial loads on concrete walls are also calculated using this method.
The tax area method is an approximate method and also a precise method.
Most of the time we create a computational model for structural analysis. It must be checked whether the model results are correct.
Validation of the computational models is also performed by Loads calculated manually using the area of influence method.
Depending on the position of the pillars, the area considered in the calculation varies.
The image above shows three speaker catchment areas.
- Area – 1: A central column with one-quarter the area of the four panels surrounding the column.
- Area – 2: An edge support has a quarter of the area of the two panels surrounding the support.
- Area – 3: A corner column with a quarter of the area of a panel around the column.
Depending on the area of the column, we calculate the axial load on the column.
We can use this method directly for area charges. However, if there are line loads on the boards, we cannot use them directly.
For example, if there is a wall on the slab and it is in a quarter of the slab, we take into account the spacing relationships in these situations.
Depending on the distance to the wall, the axial load on the support is calculated. If the wall is not within a quarter of the area to be considered for the column, the wall load for that specific column will not be considered in the area of influence method. The load calculation is therefore incorrect.
Therefore, we need to deviate from the area of influence method for these types of calculations. In these situations, the distance to the wall is considered and the loads on the surrounding supports are calculated based on the relative distances.
The column loads may differ slightly from the computer analysis model due to the lack of consideration of the stiffness of the structural elements. In the finite element method, the stiffness of structural elements depends on the load distribution.
Furthermore, irregular structures can lead to load deviations.
