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I am checking the design of an existing roof system that is comprised of steel OWSJ, decking and roofing. The roof has to be designed to store an average depth of 4" of rain water. Using the Ontario Building Code, we generally check a roof for 1.5x (snow plus factored rain). In this case...

The construction was completed in 2004. The co-gen was started up not long after that and has been running continually since. I will take a closer inspection of the spalled pieces to confirm the aggregate or lack of aggregate within the section. The first spall occurred about 5 months ago...

No. There is no sign of movement of the beam. The spalling appears only on one side of the beam, and the beam is 24" x 32"high.

another photohttp://files.engineering.com/getfile.aspx?folder=617b3347-48ca-4414-b829-a8440f6e65cd&file=Picture_010.jpg

the area never gets cold - it is in a co-generator plant. The heat never gets hotter than about 145F. Due to the location of the beam in proximity to the mechanical equipment it is very difficult to get close to the spalls. I will upload a couple of...

the 2006 OBC states that 4.1.5.10 (1) that the specified live load due to possible concentrations of load resulting from the use of an area of floor or roof shall be applied over an area of 750mmx750mm located so as to cause maximum effects. also, using the OBC, live loads and dead loads must...

I have an existing concrete beam (interior) that is subject to constant high temperatures (around 142F, 62C). At the interface between the roof deck and the beam, concrete is spalling from the face of the beam. There is no visible stress cracks on the surface of the beam, the beam has not been...