Anchor in Masonry

[TimmyH76]

I have an epoxy anchor in 6" full grouted masonry. The anchor will have ~3000 lbs. shear applied to it. tension is minimal. The hilti manual states the anchor is ok. Does the shear resistance in the cmu wall seem adequate even though it is being applied at a two single points? Thanks.

 

[UcfSE]

Make sure you're looking in the correct table for grouted cmu. Note that concrete is not the same thing as grouted cmu. Also check that you're looking under the correct edge distance value and place that information on your drawings or in your notes.

Hilti tests their products so the values in their tables will account either for anchor failure or cmu failure. Just make sure you read the whole thing so you know exactly what number you should use.

 

[Ron]

TimmyH76...I agree with UcfSE...make sure you have read the tables correctly. 3000 lb in shear is quite a bit for masonry, particularly considering the edge distance and spacing constraints they apply.

Simpson will not allow a load that high for its epoxy anchors in grout-filled masonry, and they have one of the better test facilities in the industry for anchor testing, so I tend to believe their values.

 

[TimmyH76]

Thank you all for your insight

 

[samdamon]

Rholder, you might be aware of this but I'll mention it. When looking at the shear capacity of your old existing concrete beams, keep in mind that the concrete code did not require steel shear stirrups when Vu/(phi Vc) > .5 until about late in the 1960's (Not exactly sure of the date, someone please correct me if I'm wrong). Early concrete designers relied much more on the shear strength of the plain concrete. Something to consider in your review. Regards.