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NSCP 2015 Wind Load Calculations

Using the SkyCiv Load Generator for National Structural Code of the Philippines (NSCP) 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 NSCP 2015 wind load calculations. Note that NSCP 2015 is based on ASCE 7-10 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

Users can get the wind speed by location at any time from the SkyCiv free wind speed map database. Using NSCP 2015, you just need to define the Occupancy Category of the structure and put the address located in the Philippines. Note that some wind contours were extrapolated to provide an accurate calculation of wind speeds.

NSCP 2015 wind speed map
Figure 1. Site tab of SkyCiv Load Generator

SkyCiv has digitalized the map as per the paperback standard. This means, you can simply enter in the site location and the software will automatically pull the wind speeds based on this input. There is a limit to how many times the wind speed can be calculated on the free tool. The software will use our internal interpolator to calculate values between the contours, to ensure accurate wind speeds are used in your designs.

The next step, is to define the Exposure Category of the location and the Wind Direction. The Wind Direction parameter is used in obtaining the upwind (left side) and downwind (right side) ground elevations to calculate for Topographic Factor, Kzt.

Topo data for NSCP 2015

Figure 2. Topo data for NSCP 2015.

Structure Data

The structure data and the wind and snow parameters are separated into different accordions. 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 structures for NSCP 2015 are as follows:

  • Building – supports the following roof profile:
    • Gable, Hip, Monoslope (enclosed, partially enclosed, or partially open)
    • Troughed, Pitched, Open Monoslope (open)
Building data
Figure 3. Structure data tab.

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

3D render of structure
Figure 4. 3D Render of the structure.

Next step is to define the Wind Parameters depending on the structure selected based on NSCP 2015. You can either select calculations for MWFRS or Components and Cladding.

Wind parameters for NSCP 2015
Figure 5. Wind load parameters.


Once all the parameters are defined, clicking the Generate Loads button will give a result as shown in Figures 5 and 6.

Design wind pressures
Figure 6. Results for calculation.
Wind pressure location
Figure 7. Location of wind pressures.

Detailed Calculation

The detailed wind load calculations can be accessed only by Professional account users and those who purchased the standalone load generator module. 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

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

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