Following are the **3 points** to be considered while deciding the orientation of the column.

**1. The directional ratio of the column should be nearer to 60:40 for the x & y-axis.**

This helps to resist the lateral loads on the building from all directions.

**What does that mean?**

Columns having their major axis in the x-direction **👉 ** C1, C2, C3, C4, & C7

Total no. of columns in x-direction = **5 nos. **

Columns having their major axis in the y-direction **👉 **C5, C6, C8, & C9

Total no. of columns in y-direction = **4 nos.**

The ratio by percentage = **56: 44** ✔ **OK**

**2. The structural & architectural requirements.**

Columns C2, C4, C5, & C8 intruded into the room space of the building. From a structural point of view, designing those columns might be efficient & economical. When you observe those columns from an architectural point of view, they are not aesthetic & appealing.

So, to satisfy the structural as well as architectural requirements, columns are designed to have the width of the wall.

Usually, columns are oriented in such a way that it falls in line with the masonry walls having no offsets in any direction.

**3. The sectional length of the column should be in the major plane of bending. This helps to enhance the moment-resisting capacity of the column.**

Again, your mind raises the question, **what does that mean? 😄**

**1. Column C1:**

As you can observe in the above drawing,

Column C1 supports the beams B1 & B4

The span of B1 = 3.5m. > span of B4 = 2.5m.

Therefore, the moment created by B1 will be greater than that of B4.

So, the major axis of the column should be oriented in alignment with beam B1.

**2. Column C2:**

Column C2 supports the beams B1, B2, & B4.

Here, beams B1 & B2 are on the same axis, but in opposite directions.

Therefore, the net moment along this axis is generated by the difference in the span of B1 & B2

= [5m -3m.] = 2m. < span of B4 = 2.5m.

The moment created by B4 will be greater than (B1 + B2).

So, the major axis of the column should be oriented in alignment with beam B4.

**3. Column C3:**

Column C3 supports the beams B2 & B4

The span of B2 = 5m. > span of B4 = 2.5m.

Therefore, the moment created by B2 will be greater than B4.

So, the major axis of the column should be oriented in alignment with beam B2.

**4. Column C4:**

Column C4 supports the beams B2, B3, & B4.

Here, the beams B3 & B4 are on the same axis, but in opposite directions.

Therefore, the net moment along this axis is generated by the difference in the span of B3 & B4

= [4m -2.5m.] = 1.5m. < span of B2 = 5m.

The moment generated by B2 > net moment of (B3 + B4).

So, the major axis of the column should be oriented in alignment with beam B2.

**5. Column C5:**

Column C5 supports the beams B1, B2, B3 & B4.

Here, the beams B1 & B2 are on the same X-axis, but in opposite directions.

Therefore, the net moment along this axis is generated by the difference in the span of B1 & B2

= [5m -3.5m.] = 1.5m.

The beams B3 & B4 are on the same Y-axis but in opposite directions.

Therefore, the net moment along this axis is generated by the difference in the span of B3 & B4

= [4m -2.5m.] = 1.5m.

The moment created by [B1 + B2] = [B3 + B4].

Now, **what should be the orientation? ****😲**

You can orient the column in any direction as an equal moment will be created.

But to satisfy the directional ratio of 60:40 (condition-1), the major axis of the column should be kept in the y-direction.

**6. Column C6:**

Column C6 supports the beams B1, B3, & B4.

Here, the beams B3 & B4 are on the same axis, but in opposite directions.

Therefore, the net moment along this axis is generated by the difference in the span of B3 & B4

= [4m -2.5m.] = 1.5m. < span of B1 = 3.5m.

The moment created by B1 will be greater than (B3 + B4).

So, the major axis of the column should be oriented in alignment with beam B1.

**7. Column C7:**

Column C7 supports the beams B1 & B3

The span of B3 = 4m. > span of B1 = 3.5m.

Therefore, the moment created by B3 will be greater than B1.

So, the major axis of the column should be oriented in alignment with beam B3.

**8. Column C8:**

Column C8 supports the beams B1, B2, & B3.

Here, beams B1 & B2 are on the same axis, but in opposite directions.

Therefore, the net moment along this axis is generated by the difference in the span of B1 & B2

= [5m -3.5m.] = 1.5m. < span of B3 = 4m.

The moment generated by B3 > net moment of (B1 + B2).

So, the major axis of the column should be oriented in alignment with beam B3.

**9. Column C9:**

Column C9 supports the beams B2 & B3

The span of B2= 5m. > span of B3 = 4m.

Therefore, the moment created by B2 will be greater than B3.

So, the major axis of the column should be oriented in alignment with beam B2.

I think you understood the concept.**👍**

**Note: In multi-storeyed buildings having complicated designs, several other factors are considered to decide the column orientation.**

**For all such articles over useful tips**, **click here.**

**Thank you for going through this article❤. Have a good day 😄.**

## No comments:

## Post a Comment

Please do not enter any spam link in the comment box