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ASCE7-10 Table 15.4-2

ASCE7-10 Table 15.4-2

ASCE7-10 Table 15.4-2

(OP)
What is meant by the term "Not similar to Buildings"? Obviously "similar to buildings' would be the opposite.

Does this mean no diaphragms, or does it have to due to the concept of lumped masses, as in equipment supported on an open steel framework with catwalks as needed, as opposed to a uniform dead load at each floor, as in a concrete floor?

Logically, I would think it would be the lumped mass idea.

Is there a written reference for the code definition?

Mike McCann, PE, SE (WA)


RE: ASCE7-10 Table 15.4-2

Read through the commentary C15. It has quite a bit of discussion on the differentiation between "like" and "not like" building structures.

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RE: ASCE7-10 Table 15.4-2

(OP)
Thanks JAE. I will.

NEHRP seems to suggest the difference is the seismic response.

Mike McCann, PE, SE (WA)


RE: ASCE7-10 Table 15.4-2

(OP)
Man, is the narrative convoluted or what! I will need some antacid here... :)

Mike McCann, PE, SE (WA)


RE: ASCE7-10 Table 15.4-2

There's lots of text there, but it's pretty straightforward. If it would respond like a building and has a lateral system like a building, them it's similar to a building. Other things aren't. I really think there's more gray area between non-structural components and structures not similar to a building, when you get into equipment design and things like that.

RE: ASCE7-10 Table 15.4-2

(OP)
TehMightyEngineer:

Supplement #1 is not found in the link above, but the others are...

Mike McCann, PE, SE (WA)


RE: ASCE7-10 Table 15.4-2

I haven't reviewed the commentary recently, so I may easily put my foot in my mouth. But, I tend to look at it as a Mass and stiffness issue.

Is the mass of the structure distributed relatively evenly between floor levels, like it would be for a building? Sure you can have some mass irregularities. But, conceptually could this be like a building, or is all the mass lumped at one level in a way that you'd never see for buildings?

Is the structural system similar to what you'd get in buildings with clearly defined floor levels and such? Where the various lateral frames are tied together in clean ways similar to a rigid diaphragm. Are you anticipating getting some really odd modes related to the geometry that you just wouldn't ever see with buildings?

That's sort of a mile high view of how I look at it conceptually. I'm really thinking of the dynamic behavior and mode shapes of the structure and whether or not it matches up well with the assumptions we have for building structures. I would hope the concept gets explained in greater detail in the commentary....

RE: ASCE7-10 Table 15.4-2

(OP)
Thanks for your insight Josh - kinda what I am reading into the mix too.


I am stillreading... when I can... bigsmile

Mike McCann, PE, SE (WA)


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