SinStrucEng
Structural
- Nov 11, 2022
- 88
Good day everyone,
I'm not really one to take shoring jobs but a friend of mine asked, so I am entertaining the request. FWIW I am 90% focused on residential, custom home design and maintenance engineering.
Situation:
Commercial building, three storeys above grade. Block walls (CMU) above grade, poured foundation wall. 14" OWSJ at 24" o/c throughout the building bearing onto steel columns and beams. Pretty typical as far as structural detailing goes. There was a fire on the second floor of the building; the fire was confined to one bay of the building. The investigation (by other eng consultants) found damage to all joists and steel decking in the ceiling space above the fire-affected region. As a consequence that area of the third-floor sagged and needs repairs. These repairs are already detailed and can be seen in the attached snippet ("Affected Area").
The repair details, provided by others, are shown here ("Repairs"):
Thoughts:
My friend, who is the restoration contractor, is asking for shoring details because the repair drawings have a boilerplate note indicating "shoring details by others". Looking at the plans I actually don't seen much shoring being required but I want to pick your brains nonetheless. The main elements carrying the loads (the W360x72 beam, the W360x33 steel beam, the supporting steel columns, and CMU walls) were found to be in good condition and didn't require removal. The CMU walls need some repairs but the scope is fairly minor.
The third storey's steel deck is going to be cut out, removed, and replaced along with the affected OWSJs in sections. Since the beam carrying the majority of the OWSJ loads (the W360x72) is remaining and is OK in condition, I'm a touch worried that I am missing something here. Or is it as simple/plain-Jane as it appears to me? The layout of the third floor, above, is identical to the the second floor and there are no point loads landing anywhere in the affected region. Thoughts?
I'm not really one to take shoring jobs but a friend of mine asked, so I am entertaining the request. FWIW I am 90% focused on residential, custom home design and maintenance engineering.
Situation:
Commercial building, three storeys above grade. Block walls (CMU) above grade, poured foundation wall. 14" OWSJ at 24" o/c throughout the building bearing onto steel columns and beams. Pretty typical as far as structural detailing goes. There was a fire on the second floor of the building; the fire was confined to one bay of the building. The investigation (by other eng consultants) found damage to all joists and steel decking in the ceiling space above the fire-affected region. As a consequence that area of the third-floor sagged and needs repairs. These repairs are already detailed and can be seen in the attached snippet ("Affected Area").
The repair details, provided by others, are shown here ("Repairs"):
Thoughts:
My friend, who is the restoration contractor, is asking for shoring details because the repair drawings have a boilerplate note indicating "shoring details by others". Looking at the plans I actually don't seen much shoring being required but I want to pick your brains nonetheless. The main elements carrying the loads (the W360x72 beam, the W360x33 steel beam, the supporting steel columns, and CMU walls) were found to be in good condition and didn't require removal. The CMU walls need some repairs but the scope is fairly minor.
The third storey's steel deck is going to be cut out, removed, and replaced along with the affected OWSJs in sections. Since the beam carrying the majority of the OWSJ loads (the W360x72) is remaining and is OK in condition, I'm a touch worried that I am missing something here. Or is it as simple/plain-Jane as it appears to me? The layout of the third floor, above, is identical to the the second floor and there are no point loads landing anywhere in the affected region. Thoughts?
