2009 IRC, R502.5 Allowable girder spans.
1. When beams (girders?) are used for purlin braces do you use Tables R502.5(1) and (2)?
2. I cannot find a span chart for "beams". Does this mean that all beams used for purlin and other roof bracing must be Engineered?
I have attempted to find the differences between beams and girders on the internet and there were as many different opinions as answers.
From what I've read most believe that beams carry only loads directly on top and girders carry side loads; this being the difference.
If a beam only provides resistance from the top (bending); then shouldn't only vertical loads that apply weight straight down be used on beams?
Pulin braces are an important part of the support system. Because purlins normally are at an angle to the top of the beam/girder?; it seems to me they cause stress to the sides of the beam/girder?; which makes them a girder.
Hope I phrased the above correctly.
Thanks,
Uncle Bob
1. When beams (girders?) are used for purlin braces do you use Tables R502.5(1) and (2)?
2. I cannot find a span chart for "beams". Does this mean that all beams used for purlin and other roof bracing must be Engineered?
I have attempted to find the differences between beams and girders on the internet and there were as many different opinions as answers.
From what I've read most believe that beams carry only loads directly on top and girders carry side loads; this being the difference.
If a beam only provides resistance from the top (bending); then shouldn't only vertical loads that apply weight straight down be used on beams?
Pulin braces are an important part of the support system. Because purlins normally are at an angle to the top of the beam/girder?; it seems to me they cause stress to the sides of the beam/girder?; which makes them a girder.
Hope I phrased the above correctly.
Thanks,
Uncle Bob