Wood beam wider than steel post
Wood beam wider than steel post
(OP)
I have a client that is removing a bearing wall on the ground floor in a 2 story residence. They want to keep the costs down so a steel beam is out of the question. The floor joists are 2x10 and on one side they frame into the beam and on the other side the floor joists are parallel to the beam. Also, they want the beam as shallow as possible so that it does not stick down below the ceiling to much, so I calculated that a 10.75" x 12" glulam beam would work.
My question is concerning the post. Instead of using a wood post the same width as the beam I am thinking of using a 4inch square steel post and a steel bucket welded to the end to support each end of the beam. I realize that there is some torsion on the beam but since the loading is relatively light I am not concerned about it, rather the connection of the beam to steel bucket. Anyone have any idea how to analyze the forces on the steel bucket so that I can determine the correct steel thickness?
My thoughts were along the lines of determining the eccentric moment (torsional moment/ft) along the beam length due to the floor joists hanging from one side. Then the torsional moment at each end that needs to be resisted would be 1/2 of the beam length multiplied by torsional moment/ft. So this is where I get a little confused about how to determine the bending in the bottom of the bucket that cantilevers past each side of the 4inch post.
Any thoughts would be greatly appreciated.
My question is concerning the post. Instead of using a wood post the same width as the beam I am thinking of using a 4inch square steel post and a steel bucket welded to the end to support each end of the beam. I realize that there is some torsion on the beam but since the loading is relatively light I am not concerned about it, rather the connection of the beam to steel bucket. Anyone have any idea how to analyze the forces on the steel bucket so that I can determine the correct steel thickness?
My thoughts were along the lines of determining the eccentric moment (torsional moment/ft) along the beam length due to the floor joists hanging from one side. Then the torsional moment at each end that needs to be resisted would be 1/2 of the beam length multiplied by torsional moment/ft. So this is where I get a little confused about how to determine the bending in the bottom of the bucket that cantilevers past each side of the 4inch post.
Any thoughts would be greatly appreciated.






RE: Wood beam wider than steel post
Alternatively, if the torsional moment is Mt, consider a force F acting up on one side and down on the other where F=Mt/b. Then the moment in the bent plate is F(b-4)/4 where b is the width of beam. Bolts through the upstanding legs of the bent plate and the glulam beam must be designed to resist F in single shear.
BA
RE: Wood beam wider than steel post