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ASCE 7 Wind Load Calculations (Freestanding Wall/Solid Signs)

Using the SkyCiv Load Generator in ASCE 7 Wind Load Calculations for Freestanding Wall/Solid Signs

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 gable roof, truss tower, or freestanding wall/solid signs for a maximum of 3 solves per day. 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.

Note that ASCE 7-16 can be used for Imperial and Metric units while ASCE 7-10 is only limited to Imperial.

Site Data

Users can get the wind speed by location at anytime from the SkyCiv free wind speed map database. Using ASCE 7, you just need to define the Risk Category of the structure and put the address located in USA, regardless if it is ASCE 7-10 or ASCE 7-16.

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 Site Elevation is relevant in calculating the Ground Elevation Factor, Ke, for ASCE 7-16.

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.

Structure Data

The structure data and the wind and snow parameters are separated into different accordions. In order to calculate the design wind force for the freestanding wall, the wind load checkbox should be checked. You need to select Freestanding Wall/Solid Signs on the Structure dropdown.

Figure 2. Freestanding wall/solid sign parameters.

Note that when ground to top of wall/sign, h, is greater than wall/sign vertical dimension, s, the structure is considered a solid sign. Otherwise, it will be considered a freestanding wall in the calculation. Also, the ratio of solid area to gross area, ε, should be between 0 to 1.0. You can check the 3D render of the model based on the input parameters when you click the 3D Render tab.

On the Calculate Wind Load accordion, you just need to select the structure type which should be Freestanding Wall/Solid Signs.

Results

Once all the parameters are defined, clicking the Generate Loads button will give a result as shown in Figures 3 to 5.

Figure 3. Tabulated design forces for Case A, B, and C.
Figure 4. Design force for Case B.
Figure 4. Design force for Case C.

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.

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