ASCE 7-16 wind load

[theUnsubber]

Good day.

First off, sorry if this question might come off as very basic as I have mostly worked with a different structural code.

My concern is regarding the definition of "L" in ASCE 7-16 Figure 27.3-7 (see attached). The notation guide below the diagram states that L is the "Horizontal dimension of roof, measured in the along-wind direction, ft (m)". This appears to be in contrary with the diagram wherein L is measured along the edge normal to the wind direction.

Can anyone with expertise in American codes clarify the definition of L? Thanks in advance.

 

[JAE]

It doesn't appear to show up in the ASCE errata found HERE

 

[r13]

Is there a diagram with wind direction γ = 0°? It may clear the confusion.

 

[Hokie93]

This appears to be a typo in the graphic portion of Figure 27.3-7. To the best of my knowledge, the ASCE 7 approach is to consider 'B' to be perpendicular to the direction of wind and 'L' to be parallel to the direction of wind. I believe the written definition of 'L' is correct.

 

[RPMG]

Case 1: Wind Direction at 0 degrees with L along-wind direction (sloped)
Case 2: Wind Direction at 90 degrees, where L is not used

It's an error, and I second Hokie's interpretation.