Lab - Masonry Screw Anchors Report Template.rev 2 (3)

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Cabrillo College *

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151

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Mechanical Engineering

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Apr 3, 2024

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pdf

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CON 251 Materials and Processing Laboratory # Masonry Screw Anchors Report Template Submitted by: Reid Olmsted Submitted to: Dr. Fantz Group and Lab Section Group 4, Thursdays 10:00-11:40 PM Laboratory Performed on February 22, 2024 Report submitted February 23, 2024
Introduction: The goal for this lab was to be able test the different strengths of bolts in bricks and see how the different types of anchors would affect the strngths. To do this we would drill into our brick, then set our anchors, then screw the bolt into the brick, and then bring it to the testing machine where it would slowly pull it apart until it broke. At that point we recorded the data off the machine and compared it to the rest of the data at the end of our lab. Data: This section should include your table screw anchor test results: Shear Test Type of Anchor Force at Failure Anchor #1 1 1/4 Tapcon 1259 Anchor #2 Plastic Anchor 1327.5 Pullout Test Type of Anchor Force at Failure Anchor #3 Caulking Bolt 463.1 Anchor #4 2/4 Tapcon 723.1 Analysis and Discussion: The diameter of both the 1 ¼” Tapcon screw and the 10-24 machine screw is 0.3 inches. What was the maximum shear stress for these two screws? The max shear stress for the 1 ¼” was 1259 and the 10-24 machine screw test with a max of 723.1 so the 1 ¼” was able to withstand the greatest force. Conclusions: Are your results what you expected? Do you believe there were errors in the lab that may have affected the results? If you were to perform the lab again, what would you do differently? The results definitely came in a little messed up because we had some problems with the caulking bolts, so we had to use a brick that was already tested. I think if we did our hole correctly and didn’t go too deep then our lab results for that strength would have been higher. Other than that, all our tests went well and as expected.
If you were required to mount the shelf brackets shown below into a masonry wall, what anchor would you choose for the top hole (explain why)? What anchor would you choose for the bottom hole (explain why)? If I were to mount this I would use a basic Topcon in the top of the board and for the wall I would put plastic anchors as it will have a good amount of force on those bolts.
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