Wall Bracings

[nisha1980]

Hello

I am designing a single story steel frame to support the skillion roof over transportable building (modular building) use for change rooms and toilet amenities. Building will be fabricate including the columns inside the walls and according to structural requirement and will bring to site as a whole unit to minimise site work( roof separate due to height issue , roof height 4m) and use bolted connection at site to fix the roof to column frame.

1. in terms of wall tracings to resist horizontal loads(wind loading) as shown in the doc attached as option 1. Is it a good option to have a truss as shown or do we really need to have this truss bit ?

2. As per option 2 , can we have normal cross bracing without truss bit, even it is unsymmetrical ?,

3. Which option is the better solution for wall bracing ?

4. these modular building walls are 90mm steel stud walls, the columns support the roof will be connect to walls by screw fixing . In this situations can we consider the columns are braced by the walls? then the requirement of wall bracing can be minimise.

Any replies appreciate and thank you for your time

 

[CANPRO]

Either option looks like it could be acceptable. The truss does nothing for you for lateral stability of the structure, unless you need it for some other reason its a waste of money.

What is the size of the modular sections? 5m x 4m? I think you're going to need more bracing than whats shown for transportation. Best case is if you have bracing that works for shipping and final assembly. You need to clarify what the size of the modules are, I can't see a 12m x 10m modular building getting carted around. When you're designing anything, but especially pre-fab/modular structures, you have to consider shipping, assembly, and assembled strength simultaneously - don't focus too much just on the last one or you're going to waste your time.

 

[nisha1980]

thanks Canpro for the reply.

yes there is 3 modular units and connect at site . there are custom made . 4mx10m is one unit. these modulars have "C" sections as steel studs and wall claddings. three units will be assembled at site .

thanks

 

[Ron247]

If this is 3 separate units, connected on site, I am assuming that one unit has all 3 sets of longitudinal rods in it, while the other 2 do not. May need to put one set in each unit. If not, wouldn't the other 2 units be "wobbly" during handling/transporting them? Also, the middle unit would have no transverse bracing.

I agree with CanPro, either concept works for the combined module.