Bearing resistance of steel plate 1

[GerhardSA]

Hi everyone,

I want to connect a member to the web of a plate girder and need to work out the maximum amount of force that can be applied to the bolts parralel to the member before the bolt holes elongate too much, or shearing occurs.

In our code it makes provision for shear failure and bearing resistance governed by the distance from the edge or end of the member to the side of the fastener hole. In the event of the plate being the web of a very deep plate girder using this method would be in-accurate in determining the resistance.

The DIN code makes provision for seperate shear of the pitch but only in the direction of the applied force.

My question: how do I determine the bearing resistance of the plate for 1 bolt, or per bolt in a connection if I am to ignore edge and end distance?

What I have gathered is that thickness x hole diameter x yield stress of steel gives a very low value, leading me to conclude that some yielding will take place. so I want to take yielding out of the equation.

Alternatives that I have tried is ultimate tensile strength and ultimate bearing strength.

Am having a tough time finding literature on this specific subject.

thanks

 

[trainguy]

GerhardSA,

Ignoring edge and inter-fastener spacing effects, we typically use as an ultimate bearing stress, 2 x Ftu, where Ftu is ultimate tensile strength. This is in line with many of the Fbru (Ultimate Bearing Stress) values you'll find in MIL-HDBK-5J handbooks.

For design requirements stating "no yielding", we often use 2/3 of the value calculated above.

Alternatively, you can consult the actual MIL-HDBK-5J handbook, which I believe is now called Metallic Materials Properties Development and Standardization (MMPDS). The values you are looking for are Fbry and Fbru.

tg

 

[DWHA]

For Bearing Strength at Bolt Holes where deformation at the bolt hole is a design consideration check out AISC 13th edition pg 16.1-111 Equation J3-6a.