# Shear Wall Design Example Using ASDIP CONCRETE

June 28, 2023

ASDIP CONCRETE is a structural engineering software for design of concrete members. It includes a module for Shear Wall Design based on the latest ACI 318 provisions, which generates the interaction diagram and verifies the design and detailing of the boundary members.

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

## Shear wall design example

As an example, design the first story reinforcement for a 23'-6" long shear wall in a 152'-0" high, 16-story residential building. The building columns at the ends of the wall are 36" x 36" as shown below. The structure is in SDC D based on Sds = 0.924. Use f'c= 7500 psi and fy = 80 ksi.

## Shear wall geometry

In the Geometry > Wall Web tab enter the dimensions given in the statement of the problem. Let's assume initially that the wall thickness is 24" with #7 @ 9" vertical and horizontal reinforcement at each face.

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.

The image below shows the Geometry > Wall Web tab and the At-a-Glance tab in the same screen.

In the Geometry > Boundary Members tab enter the dimensions of the enlarged elements at both ends of the wall. In this case the boundary members are the columns of the building, given in the statement of the problem as 36" x 36".

ASDIP CONCRETE generates a condensed presentation of the results, with a more detailed information organized by topic and load combination, for a quick granular check of the shear wall design as you go.

The screen shot below shows the Geometry > Boundary Members tab and the Condensed tab in the same view.

## Specifying the material properties

In the Materials tab enter the provided material properties, such as f'c and fy. In this example we will specify the parabolic Hognestad's curve for concrete, and the Elasto-plastic bi-linear distribution for steel.

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

The image below shows the Materials tab and the Detailed tab in the same view.

Use the Loads tab to enter the applied loads on the shear wall. In this case the loads are given in the statement of the problem as vertical, horizontal, and moment loads. Select the option to specify a set of nominal loads at the top of the page, and enter the loads at the corresponding load case tabs.

ASDIP CONCRETE generates the interaction diagram of the shear wall, considering the specified information about geometry, materials, and reinforcement.

## Shear wall design and detailing

The software checks the minimum steel area required in both the wall web and the boundary members, as well as the minimum dimensions per the ACI 318.

The design of shear walls includes the generation of the interaction of bending and axial loads, as shown below. The design shear force is affected by the bending overstrength ratio and a dynamic factor. It's important to limit the bending overstrength since this will impact the required shear capacity in the same proportion. In this example the applied factored shear Vu = 1040 k, but the design shear force is Ve = 3120 k. This is to ensure that a brittle shear failure will not occur.

In addition to the axial, bending, and shear design capacity check in the shear wall, the boundary members must comply with a series of detailing provisions, such as maximum horizontal and vertical bar spacing, hoop length and width, and transverse area. ASDIP CONCRETE performs all these checks per the ACI 318.

## Takeaway

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

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