Block Shear Analysis

[slickdeals]

Folks,
See attached for block shear calcs.

Is it an acceptable way to analyze the block shear on a sloping surface using the vertical/horizontal components and accounting for them as shear/tension planes?

 

[frv]

I think your worst case would be at the first row of fasteners; either a tensile rupture from top to bottom, or a tensile rupture between all the bolts and a shear rupture at the top & bottom bolt in the direction of the arrow.

 

[a2mfk]

I agree with frv, that LHS column of fasteners should be checked in tension (force to the left, same as arrow)...

 

[larsacious]

You need to determine where the COG of your bolt group is. Based on the eccentricity of the applied force to your COG you will have a better idea of where the greatest bolt force is. It is very likely that the block shear through the top 2 rows will control. With that being said, I see approximately 10 to 20 possible failure plane scenarios for this bolt group.

My favorite saying was told to me by a senior engineer in the first year of my career. He told me "the easiest solution is to make the problem go away." Meaning before you invest alot of time in solving a very complicated problem you should investigage alternative approaches (i.e. use larger diameter bolts and eliminate some of the rows, use erection bolts and field weld the plate).

Good luck!