huangyhg

roof extension
hi
i am new in this forum and i do not know where to put this question.

i am involved in design of a new triangular aluminium canopy roof extending with an angle to 3m in height and length from an existing building with concrete walls and roof. the pik edge of roof will be supported by a diagonal with angle in vertical and horizontal directions (it is not straight in any direction).

any idea how to design the roof, post and connection this roof to existing structure?
any reference book or paper?
check out our whitepaper library.
can you post some sketches?
please find attached file a copy of the architects drawings.
the existing building is a concrete/brick bunker with concrete roof. it will be extended with glass cladding and aluminium roofs.
your comments are greatful.
apparently i can not attache more than one file. if you require more sketches then please let me know.
i'm not sure where you are located, but generally aluminum structures are more susceptible to wind loading than other loads (except snow loads, of course).
for us applications, the aluminum association has a design manual (adm 2000 and adm 2005)to cover the aspects of aluminum design.
be careful with welded connections. the allowable stresses are greatly affected by welding.
other than differences in properties, aluminum design is similar steel design.
looks like they have shown a raking support column, beware of the lateral component from this.
the thing is the racking support is not vertical but with angle in both axis. the other thing is how to connect it in existing wall if it goes to sides or up and down by loads.
another file shows existing structure.
there are many ways to attach your canopy.
you could run horizontal members (say with expansion bolts) to top of wall and attach to it.
steelylee
do you have nay example or sketch showing how to make those connections?
do not forget hat the roof has slope, then it needs something like hinge to enable it to move up and down.
what about horizontal movement along the wall?
this is another sketch i have.
my thought is to run horizontal beams across the roof, anchor these and then anchor the roof to them.
did you see pictures of the skywalk at the grand canyon? it is all back span.
think along these lines.
steelylee
no, i have not seen it. could you please send it to me.
what a bout the connection in top and bottom of the column supporting top of the roof??
i attache another sketch below.
my main problem is connecting the end of roof to existing structure while allowing it to move to sides, up and down because of wind load. also a part of new side roof is connected to it according the sketches.
any sketches to undersand it better?
who selected aluminum as the structural material? i would have used steel.

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