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IS 875 Wind Load Calculations

Using the SkyCiv Load Generator for Indian Standards (IS) 875 Part 3 2015 Wind Load Calculations

To calculate the wind load pressures for a structure using SkyCiv Load Generator, the process is to define first the code reference. From there, the workflow is to define the parameters in Project Tab, Site Tab, and Building Tab, respectively. However, free users can only use the calculation for a maximum of 3 solves per day for IS 875 wind load calculations. With a Professional Account or by purchasing the standalone Load Generator module, you can use all the features of this calculation as long as you want. You can purchase the standalone module thru this link.

Site Data

Using IS 875, the first step is to define the site address located in India and the module will search for the corresponding basic wind speed based on Figure 1 of IS 875-3.

IS 875 wind speed map
Figure 1. Basic wind speed.

The next step is to define the Wind Direction, Terrain Category of the location, Class of Structure, and Importance Category of the structure. The Wind Direction parameter is used in obtaining the upwind (left side) and downwind (right side) ground elevations to calculate for Topographic Factor, k3, while the Terrain Category is used in calculating Terrain Roughness and Height Factor, k3. On the other hand, Class of Structure is used to determine Probability Factor, k1, and Importance Category is for Importance Factor, k4.

Topo parameters
Figure 2. Elevation chart and other site parameters.

Structure Data

In order to calculate design wind pressures, the wind load checkbox should be checked. You need to define first the Structure you are analyzing. Right now, the available structure for IS 875 is:

  • Building – supports the following roof profile:
    • Gable, Hip, Monoslope
    • Troughed, Pitched, Open Monoslope (canopy roof)
Building data IS 875
Figure 3. Building dimensions.

Once you have completed all the structure data inputs, you can visualize the structure by clicking the 3D Render on the right side.

Building - 3D render

Figure 4. 3D render of structure.

The next step is to define the Wind Parameters depending on the structure selected based on IS 875. You can either select calculations for Building or Cladding. From here, you just need to define the rest of the parameters. Note that for the wall/roof cladding area, you can use a comma-separated value to define multiple area inputs e.g.”100, 250″.

IS 875 wind parameters

Figure 5. Wind parameters.


Once all the parameters are defined, clicking the Generate Loads button will give a result as shown below:

IS 875 design wind pressures

Figure 6. Wind pressure results.

IS 875 wind pressure designation

Figure 7. Wind pressure locations.

Detailed Calculation

The detailed wind load calculations can be accessed only by Professional account users and those who purchased the standalone load generator module. However, as part of our BETA testing, the detailed wind load calculations is accessible to the free version. All the parameters and assumptions used in the calculation are displayed on the report to make it transparent to the user. You can download a sample detailed calculation thru this link.

Detailed wind report

Figure 8. Detailed wind calculation.

For additional resources, you can use these links for reference:

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