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Homeowner Forum / Construction / August 2005how to calculate the reaction on ridge beam
Is there a formula to calculate the load (pound/ft) carried by the roof ridge beam that is supporting tributary rafters without collar ties (the rafters are supported on the walls). Thanks AL > Is there a formula to calculate the load (pound/ft) carried by the roof > ridge beam that is supporting tributary rafters without collar ties (the > rafters are supported on the walls). Roughly half of the entire rough load. There are snow, wind, and dead loads based on your area, modifications dependent on roof slope and height above ground, etc. R In a previous post RicodJour wrote... > Roughly half of the entire rough load. There are snow, wind, and dead > loads based on your area, modifications dependent on roof slope and > height above ground, etc. Rico: A small quibble. The OP asked for the reaction. The beam carries approximately half the roof load as you correctly noted. However, the ridge beam reaction would be approximately 1/4 of the total roof load. To the OP: You will need to know the snow load for your area. If you are in a mountainous area, do not rely on the snow load maps in the UBC, SBC, or IBC codes. They are notoriously inaccurate for mountainous areas. Check with your local building official for more guidance.  SignatureBob Morrison, PE, SE R L Morrison Engineering Co Structural & Civil Engineering Poulsbo WA > In a previous post RicodJour wrote... > > Roughly half of the entire rough load. There are snow, wind, and dead [quoted text clipped - 11 lines] > or IBC codes. They are notoriously inaccurate for mountainous areas. > Check with your local building official for more guidance. Bob, a small quibble about your quibble. The body of the OP's post: "Is there a formula to calculate the load (pound/ft) carried by the roof ridge beam that is supporting tributary rafters without collar ties (the rafters are supported on the walls)." The message is asking for load information not reaction information. I usually reply to the actual message, not the subject line. People often sexy the subject line up to grab attention. I also think you may be a little too literal in your interpretation of what the OP meant by reaction. I believe he meant reactions - another way of asking for total load. YMMV R In a previous post RicodJour wrote... > I also think you may be a little too literal in your interpretation of > what the OP meant by reaction. I believe he meant reactions - another > way of asking for total load Rico: Right you are! My apologies. I guess my coffee hadn't kicked in when I replied. I was in a little too much of a hurry and didn't read clear through the original post. SignatureBob Morrison, PE, SE R L Morrison Engineering Co Structural & Civil Engineering Poulsbo WA > In a previous post RicodJour wrote... > > I also think you may be a little too literal in your interpretation of [quoted text clipped - 7 lines] > I guess my coffee hadn't kicked in when I replied. I was in a little too > much of a hurry and didn't read clear through the original post. Well, there's the problem. I have an IV stand with a caffeine drip next to the bed. I like bolting out of the starting gate. ;) R |
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