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.
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.
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.
As a user enter this option, they see the following screen.
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.
Rotation(degree): 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.
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-Direction, No. of grid lines in Y-Direction, Spacing of grid in X-Direction, Spacing of grid in Y-Direction, X grid labeling, Y grid Labeling.
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.
Then Step 3: click a reference point from which the offset is to be measured.
For Step 4: Now click on the new point to select it and then go to edit menu and add grid line.
Now in Step 5: In the new window, it will ask you to select the grid direction.
OUTCOME: As soon as you click apply you will see a new grid line on your reference point.
Hope you find this useful. Comment down below what should be the topic of the next blog.
Hi, I am Amish Kapuriya. Currently a student of Structural Engineering at Saraswati College of Engineering at Mumbai. I Completed my Bachelor's Degree in Civil Engineering from St. John College of Engineering and Technology, Palghar, Mumbai, India (2012-2016). I like writing blogs and it is my hobby to understand structures. So you will see many posts from my side, maybe one every couple of weeks.