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Hi guys, could you please help me to figure out the mean roof height in the picture? The picture is a elevation of a building.

Hi 271828, your reply is helpful a lot. In my opinion, the prerequisite for defining a collector is there a vertical element of LFRS at the same line with it. On this case, if a axial force can be developed on the beam at line B, there should be a shearwall at line B too. So the shearwall can...

Thank you dik This is not a real project. I just want to figure out the definition of a collector using this picture . In my opinion a collector should be at the same line with a shearwall. On this case, the beam should not be considered as a collector since there is no shearwalls at line B...

Thank you skeleton Please assume there is a shearwall at every line on the N-S direction coz I’d like to talk about the collector at E-W direction. If the beam can be looked as a collector, which shearwall can resist the lateral force collected from the beam?

Thank you KootK. This is what I confused. In my opinion, the collector should be at the line on which a shearwall is placed. If there is a shearwall at line B, the beam can be looked as a collector. Because collector can transfer the lateral forces from diaphragms both side to the shearwall at...

Please see the picture. Assume this is one story wood structure building under seismic control. The shearwalls are at exterior walls both side (the red lines) My question is May I treat the beam at line B as a collector (the green line) if there is no interior & exterior shearwalls on line B...

See ASCE 12.10.1.1 “floor and roof diaphragms shall be designed to resist design seismic forces …………… in accordance with eq. 12.10-1”. If I design a floor diaphragm (wood structure), or slab (concrete or steel structure), May I use Fpx (calculated from 12.10-1) divided by the floor length as a...

Got it! The ratio of length to height is only applied to calculate shear wall. Thank you Jayrod12!

Thank you HTURKAK! If the structure is steel brace whose length is also 24 ft. May I also think it’s a 2 bays steel brace? This confused me because in my opinion, a steel brace bay is the space between two columns with one beam. Thus in this steel brace case, the bay should always be one as...

Hi guys, a fresh Structual engineer. I am confused to define the number of bays in ASCE 7-05 section 12.3.4.2. A concrete shear wall structure. If the story height is 12 ft and a continue concrete shear wall length is 24ft, May I look it as a 2 bays shear wall since the ratio of length/height...