Everything You Need To Know To Find The Best Bolt Pull Test

Understanding Pull Tests and Their Significance

When and why is a pull test recommended?

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We advocate for conducting pull tests on every wall we anchor or pin for a few crucial reasons. The primary reason is that facade stabilization involves significant safety implications, which we take very seriously. Secondly, while we have third-party laboratory test values for anchoring systems, real-world conditions on retrofit or post-installed projects can vary drastically. Performance may not always match laboratory values and sometimes even exceed them. Based on various factors like the condition of the mortar, brick, or the substrate, the solution can vary from project to project and even from wall to wall.

For example, an anchor's lab-tested ultimate capacity might be 500 pounds, but on-site it might show a capacity of just 50 pounds. This discrepancy necessitates a different solution, leading you to gradually select a more suitable option. In some instances, this might involve modifying the installation method using different drill types or methods, or changing the pilot hole size. Alternatively, the anchor type might need adjusting, such as increasing the anchor's diameter or changing it from a hammer-set Stitch-Tie helical anchor to an adhesive-style Grout-Tie, or even to a mechanical expanding fastener like the Grip-Tie product line. Each type has its advantages and disadvantages, and a cost-benefit analysis can determine the most appropriate anchoring solution for each specific project.

Insights on Adhesive Anchor Pull Tests

When working on a project involving post-installed rebar in an existing foundation using epoxy, you might encounter instances where the drilling process suggests voids. For example, a contractor might notice little resistance when drilling and suspect a void is present. Using a scope can confirm whether voids exist and assess the soundness of the concrete. If no voids are found and the concrete appears sound, installing the anchors and conducting a pull test is recommended. A successful pull test indicates no further action is required.

The appropriate pull test load can be a point of contention. An initial reaction might be to pull to the yield strength of the bar since that's its design purpose, but it is wise to seek additional opinions due to the potentially significant load involved. For guidance, you can consult the ICC report for the specific product, like the RE 500, or look at similar products for proof testing recommendations.

Proof testing typically uses a percentage of the steel strength or bond strength as a guideline. For instance, Simpson’s Set-XP ICC 2508 Section 4.5.2 specifies pulling to 67% of the nominal bond strength bond stress for uncracked concrete, modified for edge effects and concrete properties, or 80% of the minimum specific anchor element yield strength.

It's important to note that as you approach failure in any anchor test, serious displacements might occur. This could be a limiting factor depending on the situation. Moreover, to ensure valid pull test results, spreading the reaction apart far in excess of 3 h_ef can legitimately test the anchorage.

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