Gust Effect Factor - Rigid Building Assumption
Gust Effect Factor - Rigid Building Assumption
(OP)
Are there any universally accepted rules of thumb for when it is safe to assume your structure is rigid without trying to calculate a period to prove it? For instance, I have seen in one place where it is recommended that any building less than 50 feet in height can be assumed rigid regardless of the system.
When do you feel it is necessary to calculate the period to check if the structure is rigid?
When do you feel it is necessary to calculate the period to check if the structure is rigid?






RE: Gust Effect Factor - Rigid Building Assumption
I have been irritated by this factor for years.
I had a old timer I worked with once "steel flexible concrete rigid"
I seriously think he used that as his go-by
RE: Gust Effect Factor - Rigid Building Assumption
http://www.eng-tips.com/viewthread.cfm?qid=30135
RE: Gust Effect Factor - Rigid Building Assumption
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RE: Gust Effect Factor - Rigid Building Assumption
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RE: Gust Effect Factor - Rigid Building Assumption
RE: Gust Effect Factor - Rigid Building Assumption
Diaphragms constructed of wood structural panels or untapped steel decking may be assumed flexible provided...
1) Toppings of concrete or similar materials on WSP diaphragms are nonstructural and no greater than 1.5 in thick.
2) each line of vertical elements of SFRS complies with allowable story drift of Table 12.12-1.
3) vertical elements of SFRS are light-frame walls sheathed with WSP or steel sheets.
4) portions of WSP diaphragms that cantilever beyond vertical elements of LFRS are designed in accordance with SDPWS 4.2.5.2
RE: Gust Effect Factor - Rigid Building Assumption
RE: Gust Effect Factor - Rigid Building Assumption
asixth - Interesting rule of thumb.
FiniteElemet - I'm not sure what assumptions about diaphragm behavior apply to the structure as a whole.
RE: Gust Effect Factor - Rigid Building Assumption
I just want to know what others have been doing.
I promise I won't tell the authorities if you have been just summarily assuming everything is rigid.
RE: Gust Effect Factor - Rigid Building Assumption
Steel and concrete moment frames: about ten story high
Steel, concrete, and masonry - braced frames or shear walls: about fifteen story high
RE: Gust Effect Factor - Rigid Building Assumption
http://www.nceng.com.au/
"A safe structure will be the one whose weakest link is never overloaded by the greatest force to which the structure is subjected" Petroski 1992
RE: Gust Effect Factor - Rigid Building Assumption
RE: Gust Effect Factor - Rigid Building Assumption
RE: Gust Effect Factor - Rigid Building Assumption
RE: Gust Effect Factor - Rigid Building Assumption
RE: Gust Effect Factor - Rigid Building Assumption
RE: Gust Effect Factor - Rigid Building Assumption
I was meaning to ask about Steel Braced frames. I didn't see anything in the commentary about them. I was wondering what you do for them.
do you simply take the period to be 1/n1 (from C6-17 or C6-18?)