October 4, 2023

bearing-wall-example

ASDIP WOOD is a structural engineering software for design of wood members. It includes a module for Bearing Wall Design based on the latest NDS provisions, which calculates the adjusted design values for the required types of stresses, and shows the design ratios accordingly.

But how do you enter the information in the program? How do you check the results? How do you optimize the design in a real-life example? The following is a step-by-step bearing wall design example using ASDIP WOOD.

LSL Bearing wall example

As an example, determine the required size of the LSL studs, using LRFD, for the first story bearing wall of the wood building shown below. Assume dry service conditions and normal temperature range. The design loads include roof and floor gravity loads, and lateral out-of-plane wind pressure as shown.

bearing-wall-example

Bearing wall geometry

In the Geometry tab enter the dimensions given in the statement of the problem, such as the wall height = 16'-0" and stud spacing = 16". Note that this exterior wall is pretty high, and in addition it's exposed to a wind pressure. Select Composite as the stud type, and specify LSL as the composite type.

The At-a-Glance tab shows a summary of the results, with the most important information, for a quick overview of the design. If a deficiency is identified, it can be further investigated in the other reports which offer a more detailed information.

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Specifying the material properties

In the Materials tab specify the material properties. Click on the Select from Database button to show the corresponding table of products from the manufacturer. Select 1.5E Grade for this example. The program will transfer the material properties to the template.

ASDIP WOOD generates a detailed presentation of the results in the Detailed tab, showing step-by-step calculations organized by topic and load combination, with exposed formulas and references to the NDS code. This is excellent for a deep granular check of the design.

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Enter the applied loads

Use the Loads tab to enter the applied loads on the wall. In this case the loads are given in the statement of the problem as dead, live, and wind loads. Specify LRFD as the design method. Enter the following loads in the corresponding load case tabs.

Roof D = 10 psf x 8' = 80 plf. Floor D = 8 psf x 8' = 64 plf. Wall D = 7 psf x 28' = 196 plf. Therefore, D = 340 plf. Roof L = 20 psf x 8' = 160 plf. Floor L = 40 psf x 8' = 320 plf. Wind pressure = 50 psf.

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Optimizing the design

Go back to the Geometry tab and click on the Select from Database button. Select a section to be tested. The software calculates the adjustment factors for the different design conditions per the NDS and the product manufacturer. These factors affect the reference design values for the specified material. With this information the program calculates the design ratios for compression, bending, shear, and bearing. Finally it calculates the interaction for combined stresses.

Please note that the sheathing provides continuous lateral support to the studs in the weak direction, so the slenderness effects are calculated using the strong-axis section properties. In this example, the optimal section that passes all checks is 1.5" x 5.5" LSL studs @ 16". The user can select other preferred sections easily from the database. 

Takeaway

ASDIP WOOD includes the design of bearing walls. This step-by-step design example shows how fast the design can be completed and optimized using ASDIP WOOD. The results are shown instantly in both text and graphics format for an immediate granular check.

For our collection of blog posts about concrete design please visit Structural Wood Design.

Detailed information is available about this structural engineering software by visiting ASDIP WOOD. You are invited to download the Free 15-day Software Trial, or go ahead and Place your Order.

Best regards,

Javier Encinas, PE

ASDIP Structural Software

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