Slotted connections in steel members

[Yazan Atoum]

Hello Engs.

I have a connecction between two steel beams, one resting on another, it's bridging between two buildings so movement in 2 direction have to be considered.
I had come to this detail where the bottom flange has a long slotted hole while the top flange of the other beam has oversized hole. my concern is is it possible to install this bolt between two slotted holes and to fix it in a way to allow movement of the flanges properly without causing any problem.

 

[12345abc6ttyui67]

How much movement do you need in each direction?

It looks like you are trying to (almost) keep the connection within the depth of the beam, is this a strict requirement?

I presume you will be designing the connection for the vertical load, with some nominal friction (30%?) of the vertical load applied in both horizontal directions?

Personally I'd be looking at a seat from the column, which has something like a PTFE lined slide unit, which the incoming beam rests on. If you are worried about restraining the beam from 'falling off' the seat, I'd include some sort of plate arrangement to prevent that from happening at the upper end of the deflection range.

 

[hokie66]

That sort of connection calls for a slide bearing. Suggest you contact a bearing supplier for advice. If you build it as shown, with steel on steel, the noise will drive the occupants crazy. The slightest movement will sound like a rifle shot.

 

[Ron]

.....and since it is steel on steel, it will probably corrode and sieze with time

 

[klaus.]

I agree...looks to me you need a 'real' sliding bearing

 

[bones206]

Another consideration is to provide rotational restraint at the top of the beam for stability.

 

[MGaMart]

Movement is two directions? A sliding bearing pad is the way to go. You should also consider adding retention bars/angles to prevent the beam from falling off the support during erection since typically bolts are not used when movement happens in both directions (also helps to better define the maximum amount of lateral movement you anticipate the beam will experience)

 

[amec2004]

I would suggest you to use sliding stainless plate on Teflon instead

AISC Steel Connection Design Software

http://asp.civilbay.com/connect