Christian, as you note the 0.42 factor in IBC is historic and ties back to ASD design. The ASCE 7 committee has not discussed updating this in IBC, but it could become a topic of discussion for the ASC 7-28 Committee, which will be formed in a few months. Look for a call for volunteers...
Hi Christian, Thanks for your excellent and thoughtful input. I especially enjoyed your style which makes it entertaining to read so thanks for that also! I hadn't considered items in your third paragraph, which offer a great perspective. In fact that's currently the best explanation and...
Hello Keith, I can't answer your question with any authority, but I'll share my thoughts and provide context. You probably already know some of this, just trying to cover all bases. Drawing heavily from two webinars presented by Emily Guglielmo: SEA-MW September 2021 Meeting, and Session 1 of...
Hi Thomas, My first take is similar to yours, that it might be an error. However note that for this section the commentary explicitly acknowledges that the zones are larger (see the last 2/3 of the first paragraph C29.4.3). Also I note that the figure in the commentary C29.4-1 repeats the...
Hi all, My question is about ASCE 7-16, Part 4 of Chapter 30 (C&C) and particularly how to apply Notes 3 and 4 of Table 30.6-2. As an example, let’s consider a gable roof with the following details: h = 70’ Θ = 10 deg Exposure C V = 100 mph Zone 3e (edge corner of roof) Effective Area = 10 ft2...
ASCE 7 has moved away from drift checks based on a fixed ratio of design wind loads. The motivation for this is understandable. As the commentary (Section CC1.2 in ASCE 7-10) suggests, different projects may have different risk tolerance for serviceability failure. For example, I am working...
The "Building Roof Plan" in Figure 29.4-7 of ASCE 7-16 indicated that the width of Zones 2 and 3 is 2h where h is the height of the building at the eaves. Shouldn't this read 0.2h, which would be more in line with Figures 28.3-1, 28.5-1, 30.3-1 and, more applicably, 30.4-1 or 30.6-2 for flat...
Wind Tunnel Testing for Buildings and Other Structures, Standard ASCE/SEI 49-21 provides the minimum requirements for conducting and interpreting wind tunnel tests to determine wind loads on buildings and other structures. Wind tunnel tests are used to predict wind loads and responses of a...
Minimum Design Loads and Associated Criteria for Buildings and Other Structures, ASCE/SEI 7-22 provides the most up-to-date and coordinated loading provisions for general structural design. This standard prescribes design loads for all hazards including dead, live, soil, flood, tsunami, snow,...