Advice for drift allowance? Glass Curtain Walls & Ceramic Block Perimeter
Advice for drift allowance? Glass Curtain Walls & Ceramic Block Perimeter
(OP)
Looking for advice on how stringent the drift allowance should be against wind on a 2-story office building? Perimeter is mostly glass curtain wall and ceramic brick. I normally use L/240 at roof level for my buildings (usually not this much glass, many industrial). I know this should be more stringent but can't seem to find anything. Thanks in advance for any help.






RE: Advice for drift allowance? Glass Curtain Walls & Ceramic Block Perimeter
RE: Advice for drift allowance? Glass Curtain Walls & Ceramic Block Perimeter
RE: Advice for drift allowance? Glass Curtain Walls & Ceramic Block Perimeter
Analysis and Design of arbitrary cross sections
Reinforcement design to all major codes
Moment Curvature analysis
http://www.engissol.com/cross-section-analysis-des...
RE: Advice for drift allowance? Glass Curtain Walls & Ceramic Block Perimeter
The wind speed 'calculator' on the Applied Technology Council website (www.atcouncil.org) provides the 10-year, 25-year, and 50-year MRI wind speeds as part of its output. The software is free and very user-friendly, if you aren't familiar with it.
As an aside, I have found that the design wind pressures for ASCE 7-10 are essentially equal to the ASCE 7-05 values for Risk Category II and III/IV structures in non-hurricane prone regions (areas where V=90 MPH for ASCE 7-05) and approximately 20% less for hurricane-prone regions.
RE: Advice for drift allowance? Glass Curtain Walls & Ceramic Block Perimeter
RE: Advice for drift allowance? Glass Curtain Walls & Ceramic Block Perimeter
RE: Advice for drift allowance? Glass Curtain Walls & Ceramic Block Perimeter
Good thread:
http://www.eng-tips.com/viewthread.cfm?qid=267575
From AISC's website, do you have access to Design Guide #3?
4.1.2. Why are deflection and drift limits not specified in the 2005 AISC Specification?
Deflection and drift are examples of serviceability criteria. Serviceability limitations are not mandated other than the requirement in the 2005 AISC Specification Section L3.1 that "Deformations ... shall not impair the serviceability of the structure." Summarizing from the 2005 AISC Specification Commentary Section L3.1, any specific serviceability limit would depend on the function and components of the structure. Guidance can be found in AISC Design Guide #3, Second Addition Serviceability Design Considerations for Low-Rise Buildings (West and Fisher,"Deflections In Structural Members And Structural Systems... Shall Not Impair Serviceability of the Structure" 2002).