masonry diaphragm aspect ratio
masonry diaphragm aspect ratio
(OP)
We are adding a 90' long x 25' wide connector between two warehouses. There will be two 90' long, 12" thick reinforced masonry walls. The roof will consist of 25' long joists spaced at 6' on center with 18ga type B metal roof deck. The 18ga metal roof deck will be tied into the precast concrete shear walls of the existing warehouses.
I have a 90'x25' metal deck diaphragm which works for strength and deflection (36/7 puddle welds with #10 sidelaps at 12"). This diaphragm length-to-width ratio exceeds IBC table 2109.2.1.2 which states the maximum length to width ratio is 2:1 between masonry shear walls. BUT, my connector building is 90' between PRECAST CONCRETE SHEAR walls (we are not adding 25' long masonry shear walls at each end). So, am I ok here? Am I missing something? Thanks for the input.
I have a 90'x25' metal deck diaphragm which works for strength and deflection (36/7 puddle welds with #10 sidelaps at 12"). This diaphragm length-to-width ratio exceeds IBC table 2109.2.1.2 which states the maximum length to width ratio is 2:1 between masonry shear walls. BUT, my connector building is 90' between PRECAST CONCRETE SHEAR walls (we are not adding 25' long masonry shear walls at each end). So, am I ok here? Am I missing something? Thanks for the input.






RE: masonry diaphragm aspect ratio
Are you going to allow thermal movement between the infill structure and the existing buildings? Given the potential for an expansion joint and having to analysis existing structures for new lateral loads and detailing requirements, you may wish to consider providing a completely separate lateral system for your infill building.
RE: masonry diaphragm aspect ratio
Since you violate the 2:1 with a 90:25 roof, I would think you simply have to leave 2109 (Empirical Design) and use 2107 or 2108.
RE: masonry diaphragm aspect ratio
RE: masonry diaphragm aspect ratio
If the above is a problem, could you provide isolation joints at each end of your connector, and provide a series of steel portal frames along the length of the connector?
RE: masonry diaphragm aspect ratio
RE: masonry diaphragm aspect ratio