Grid Lines – Definition of Grid Lines

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Grid Lines

What is a Grid line?

Grid lines are used as a reference so that an object can be placed accurately to mesh for analysis. We use the X and Y axis as a reference for our most of the Engineering drawings. Similarly, in ETABS we have many reference lines at user-specified distances.
One of the features of ETABS is that we can label a grid line, making it easy to find a location within the model.

Grid Dimension

In the previous blog, we introduced the Grid dimension.
Grid dimension depends on the Number of lines in X and Y direction and spacing between them.
If the spacing is uniform in both direction, it is a uniform grid spacing.
If not uniform then it is a custom grid spacing.
Not all building plans have a uniform spacing, so using a custom grid as per convenience is useful.

Grid Line

Grid Label

This option labels the grid lines as per users preference.
Default label in the X direction is A, B, C, D… so on starting from left to right.
Similarly, the label in the Y direction is 1, 2, 3, 4… so on starting from bottom to top.
A user can change the label format or the order or labeling.
This option is available in New Model Quick Templates> Grid dimensions (plan)> Specify Grid Labeling Options.

Example of Grid Labeling

Custom Grid

As a user enter this option, they see the following screen.

Custom Grid options

1. Grid System Name:

First, they need to name the grid system.

2. System Origin:

Default global coordinate origin is (0,0,0). But if a user wants an offset from the origin, they have to use this option. A User needs to provide the following data,
Global X:
 Provide an offset distance on the new grid system from the global origin in the X direction.
Global Y:
 Provide an offset distance on the new grid system from the global origin in the Y direction.
  Provide an angle or theta(radial grid lines in cylindrical system) for the new positive X-axis with respect to Global X-axis, if any.

3. Reference point:

These are reference points which could be drawn into a reference line is future as the work progresses. Values are provided in X and Y directions.

4. Reference plane: 

These are reference plane created in the Z direction, to snap on or use as working plane in Elevation view.

5. Bubble Size: 

As we mentioned about grid label, to display them we use bubbles. So a user can decide the size of a bubble by providing the size in mm.

6. Colour:

Not only the size, Colour of the bubble can also be changed. A user can change the colour of the grid line as per his needs. The default colour of the grid is grey.

7: Quick Start New Rectangular Grid:

Sometimes the grid required of a project may not be uniform but could be Rectangular. So ETABS provides an option of the custom grid but rectangular.
In this option, a user gets all the options like No. of grid lines in X-DirectionNo. of grid lines in Y-Direction, Spacing of grid in X-Direction, Spacing of grid in Y-Direction, X grid labeling, Y grid Labeling.

Quick start new Rectangular Grid option

To use the custom grid, a user gets 2 choices:
Method 1. To provide Grid data as ordinate: This means user provide ordinate in X and Y Direction at which a reference line is to be drawn. For example, if user provide X coordinates as 0, 8, 16, 24 and Y coordinates as 0, 5, 10, 15. Then they will get 4 reference lines in the X direction and 4 reference lines in the Y direction at all specified coordinates.

Method 2. To provide Grid data as Spacing: Instead of providing the location of the reference axes we provide the spacing between 2 adjacent lines in X and Y direction.

How to add new grid lines in the model?

Sometimes, a user may need to create an additional grid line or more to help him in simplifying the process. So here is a method to do so.

Add Grid line at a selected joint.

Step 1: Go to draw menu and select draw joint objects.


Next Step: Step 2: Provide offset distance.

Step 2

Then Step 3: click a reference point from which the offset is to be measured.

Step 3

For Step 4: Now click on the new point to select it and then go to edit menu and add grid line.

Step 4

Now in Step 5:  In the new window, it will ask you to select the grid direction.

Step 5

OUTCOME: As soon as you click apply you will see a new grid line on your reference point.


Final result

Hope you find this useful. Comment down below what should be the topic of the next blog.

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