Hi,
I'm starting to get a bit anxious about my house as the contractor keeps giving me vague answers, so I'm hoping someone here can help me. I have a wooden intermediate floor and a LT beam of 90x405, with a span of 6m that my steel staircase rests on. The steel staircase (weighs 1 ton!) is free-hanging and L-shaped, so there are some loads going all over the place here, but I'm starting to worry about the intermediate beam and whether the LT beam can withstand this staircase. I read a bit on the wood guide and saw that LT90x495 has a buckling limit of 40kN, is the buckling limit on the dimensions of the beam?, and then there wouldn't be any problems but what happens if the LT beam is connected to another LT beam with the same dimensions using screws and a beam support? I might be reading the table wrong and it's not 40kN that's applicable.
I hope I described it clearly and can get some help from people who know about this.
I'm starting to get a bit anxious about my house as the contractor keeps giving me vague answers, so I'm hoping someone here can help me. I have a wooden intermediate floor and a LT beam of 90x405, with a span of 6m that my steel staircase rests on. The steel staircase (weighs 1 ton!) is free-hanging and L-shaped, so there are some loads going all over the place here, but I'm starting to worry about the intermediate beam and whether the LT beam can withstand this staircase. I read a bit on the wood guide and saw that LT90x495 has a buckling limit of 40kN, is the buckling limit on the dimensions of the beam?, and then there wouldn't be any problems but what happens if the LT beam is connected to another LT beam with the same dimensions using screws and a beam support? I might be reading the table wrong and it's not 40kN that's applicable.
I hope I described it clearly and can get some help from people who know about this.
A 90*495 can handle a shear force of 57kN and a moment force of 74kNm.
Your stair provides a shear force of 6 kN and a moment force of 18kNm from its self-weight. Then additional live load from the floor/stair and self-weights from the floor construction are added.
What does the floor construction look like? What is the spacing between beams?
Your stair provides a shear force of 6 kN and a moment force of 18kNm from its self-weight. Then additional live load from the floor/stair and self-weights from the floor construction are added.
What does the floor construction look like? What is the spacing between beams?
4 years laterH huggan said:
hope huggan is still active in the forum because you seemed to know your stuff. I remembered I was a member here and saw that I forgot to respond to this. It can be good for others to understand some construction theory and for me to breathe a sigh of relief I am attaching my floor structure. We have also added foam for underfloor heating and screeded the entire floor. So the screed is relatively heavy as well.