Analytical Bolt Calculation 2

[Sjqlund]

Hi eng-tips engineers!

I'm designing a bolted connection for a construction.


I'm quite unsure how to handle this statically indeterminate system shown on the picture below:

http://imgur.com/GNlr2G6

I know how to approach single bolt groups which are eccentrically loaded. This i usually do by moving the force to the center of the bolt group, and adding a moment.

However in the situation depicted on the image i dont know how to do this. One idea i had was to model the beam as being fixed in both ends (shown below), and then find the reaction forces at each end to the bolt group.

http://imgur.com/tcK9wYG

Would my idea work, or do you have other suggestions?

 

[JoshPlumSE]

Page 7-6 through 7-9 of the AISC 14th edition steel code. You can use either the elastic or instantaneous center of rotation methods. This should be the same methods described in Salmon and Johnson.

The only tricky part is that you will be putting in a "fake" eccentricity (e= M / V) that allows you to design for your end reaction moment.

 

[Bagman2524]

Agree with TLHS/rb1957. Assme fixed ends. Calculate the end reactions & momnents and size each end connection using the elastic method.

There is ample precedent in the history of science for the overwhelming bulk of the scientific community strongly believing in imaginary entities postulated by a favovered theory. -Michael Behe

 

[yakpol]

As sugested by many, design 4-bolts group for eccentric shear using AISC-13 or 14 tables.
V = P/2 for symmetrical application
M = PL/6 for fixed ends
e = M/V = L/12
L = distance between centers of boltgroups.