William- I believe you are misinterpretting the figure and note. Note 3 states that the soffit pressure, ps, is equal to the wall pressure pw, not that the wall pressure is dpeendent on the soffit pressure. The arrows are shown in two different directions because just as with any location on...
Ah, I see. I tend to think of the ASCE 7 as a balancing act between ease of implementation and economy of design, but you make a great point about the importance of transparency. I would argue that the current live loads are very easy for engineers to use (aside from those pesky load...
While I understand the pros and cons of ASD & LRFD, once AISC combined them into one manual, the differences began to disappear to all that remains is a conversion between the two. What is the load and what is the capacity? Well, that depends... the public (or client) demands a clear answer...
Ron, I appreciate the thorough explanation, and I'm sorry for not responding sooner. In fact, I wish this timeline was part of my undergrad curriculum. Only after entering practice did I realize how little I knew about ASD, and how much my understanding of design loads and limit states...
James, Thanks for the response. You make a good point, but for environmental hazards, the safety factor lives in the return period to establish uniform risk. For example, I'm told that snow loads in ASCE 7-16 and earlier resulted in dramatically different probabilities of failure across...
Chad, Thanks for the thoughtful response. It's certainly true that we wrap a lot of big questions into our floor loads, and it may be true that the public cares more about minimizing risk from human-imposed loads than minimizing risk due to external hazards like earthquakes. That's hard to...
Channels do better, pipes and box sections are having a problem of corrosion inside because we can't protect inside by painting. Myself used the channels with inside filled with concrete used as lintels for renovation of a building.
Thank you, Ron. I'll look out for that announcement. Does anyone have an opinion either way about the IBC vs ASCE 7 approach to service wind? Using a fixed factor is simpler, but ASCE's MRI method ties the drift check to more tangible performace objectives. -- Christian Parker P.E., M.ASCE...
Hello Alex, I can't speak to the Indian codes, but I wonder if part of the reason you're not able to "fully utilize" the section is that stability limit states and flexure-torsion interaction govern the design. In AISC 360 (US code for steel), single angle flexural members must be checked for...
It's Beuro of indian standard IS 800 1984 and IS 800 2007, consider angle equal or unequal legs center of gravity is out side the section, if it's a rectangular section bar center of is at the geometrical center, then if the line of action of the load is coincide with the center of gravity line...