Design of Anchor Plates

The design of anchor plates, as per the AISC LRFD (American Institute of Steel Construction Load and Resistance Factor Design) standard, involves determining the appropriate size and strength of anchor plates used to connect structural elements to the foundation. Anchor plates are commonly used in structural steel and concrete construction to provide stability and transfer loads between the structure and the foundation.

Here is a general overview of the design process for anchor plates according to the AISC LRFD standard:

1. Determine Applied Loads: Identify the applied loads, including dead loads, live loads, wind loads, seismic loads, and any other relevant loads that the anchor plate will be subjected to. Consider both the magnitude and direction of the loads.

2. Select Anchor Bolt Type and Diameter: Choose the type of anchor bolts to be used, such as headed bolts or threaded rods, and determine the appropriate bolt diameter. Consider the requirements for tension and shear resistance, as well as any specific project specifications.

3. Determine Edge Distance and Spacing: Calculate the required edge distance, which is the distance from the centerline of the anchor bolt to the nearest edge of the anchor plate. Ensure that the edge distance meets the minimum requirements specified in the AISC LRFD standard. Additionally, calculate the required spacing between anchor bolts to ensure proper load distribution.

4. Check Anchor Plate Thickness: Determine the required thickness of the anchor plate based on the applied loads and the strength properties of the material being used. The anchor plate should be thick enough to resist the applied loads and prevent excessive deformation or failure.

5. Calculate Anchor Plate Resistance: Evaluate the anchor plate's resistance to tension, shear, and bending moments using the appropriate equations and formulas provided in the AISC LRFD standard. Consider the design strength and allowable stresses for the specific material being used.

6. Verify Stability and Connection Design: Ensure that the anchor plate and the connection to the structural element and foundation provide adequate stability and resistance against uplift and overturning forces. Check for proper embedment depth, anchor bolt projection, and proper detailing of the connection.

7. Consider Special Conditions: Address any special conditions or requirements specific to the project, such as corrosion protection, fire resistance, or seismic design considerations. These factors may require additional design provisions or considerations.

8. Verify Compliance with Code Requirements: Confirm that the design of the anchor plate meets all relevant code requirements and standards, including the AISC LRFD. Ensure that the anchor plate design satisfies all necessary safety factors and load combinations specified in the design codes.

Calculation Reference

Thread Mechanics

Strength of Fasteners

Joining Materials