Chemical anchors are installed retroactively into existing concrete surfaces. Instead of a mechanical anchoring device, they are anchored using a grout or resin installed in the annulus between the bolt and a hole drilled into the concrete surface. The CivilWeb Concrete Anchorage Design Spreadsheet can be used to complete all the required calculations for chemical anchors in accordance with BS EN 19922-4. Some typical examples of chemical anchors are shown in the diagram below.
Chemical Anchors in Tension - Design Verifications Required
The following design verification checks are required for chemical anchors according to BS EN 1992-4. All these checks can be completed using the CivilWeb Concrete Anchorage Design Spreadsheet. Follow the links below for detailed explanations of how the spreadsheet calculates each design check.
- Steel Bolt Failure
- Combined Concrete Cone Failure and Anchor Bolt Pullout Failure
- Concrete Cone Failure
- Concrete Splitting Failure
These verifications are also shown in the below table.
Chemical Anchors in Shear - Design Verifications Required
The following design checks are required for chemical anchors under shear loading;
- Steel Bolt Failure in Shear Without Lever Arm
- Steel Bolt Failure in Shear With Lever Arm
- Concrete Edge Failure
- Concrete Pryout Failure
These verifications are also shown in the below table.
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