Steel Joist Sizing

[aokamura]

I need a suggestion or recommendation on how to make a 8" deep steel joist fit in a 9" space.

The existing steel joist is supporting the metal decking and concrete topping on the second floor (e.g. joist supporting second floor), which is supported by a beam spanning in the opposite direction of the joist. It is flush-frame, and the depth of the existing joist is 9" (built in 1960's). However, we want to use an 8" or 10" deep joist... is there a way to fit an 8" deep joist into a 9" space? Or, is there a way to fit a 10" deep joist into a 9" space?

Any help would be appreciated. Thanks!

 

[aokamura]

Thank you to Ltwine and all who provided helpful suggestions!

 

[Ltwine]

For full length replacement, I suggest you should consider connecting one end (joist to cross beam joint) using angles, or plates, with slotted holes (on joist side) for ease of erection. It is difficult to have perfect fit of the joist to accept weld on both ends.

Also, if necessary, I think 10" joist might work too, but you may have to cope (cut out) the bottom flange at the ends to fit the joist into the cross beam (assume 10" too).

Again, check your cal. Hope everything work out smooth, good luck.