CSI ETABS - 05 - Center of Mass and Center of Rigidity
ฝัง
- เผยแพร่เมื่อ 9 ก.ค. 2024
- In this video discuss about,
Center of Mass (CM) and Center of Rigidity (CR) in ETABS
1- Center of Mass (CM) and Center of rigidity (CR) Excel Sheet
Download: civilmdc.com/2020/03/09/cente...
What is center of rigidity?
Center of rigidity is the stiffness centroid within a floor-diaphragm plan.
Center of Mass
It is the average position of all the parts of the system, weighted according to their masses
Check in CSI ETABS
During analysis, ETABS automatically calculates this coordinate for each floor diaphragm. The diaphragm assignment must be present in the model. Center of rigidity and center of mass are then displayed by selecting Display --)) Show Tables --)) Analysis --)) Results --)) Structural Results --)) Centers of Mass and Rigidity --)) OK.
Reference CSI Technical Knowledge Base
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M.hussain plz share contact number
When I was looking for a short method to find mass and rigidity center, I found your video and channel. Thank you very much for all your videos.
Welcome and thanks for such a nice feeding
Very thankful to you for such a nice video series on Etab. YOu are doing great job.
excelente video al fin encontré una buena explicación de como calcular el centro de masa en etabs.
ما شاء الله
when I searched on youtube for someone like you, I did not find anything... now you appear out of blue.
Thanks
Hi! I'm not clear about the difference between (XCM,YCM), and (XCCM,YCCM). ¿It is the first pair the Center of mass of the floor, and the other one the center of mass of the cumulative structura actuating in a spefic story floor?
M hussein with regards to your CM and CR i observed that it is from your gridlines.
Meaning ex and ey coordinates is base on the Grid from 0,0 as your ref pt.
Does it mean that whatever shape of the building just put the max gridline length for X and Y???
Please correct me if im wrong.
Excuse me, I have a question. Why is the summary mass of the diaphragm in ETABS not available, even though the summary mass of the story is available?
very helpful thanks
what loads considered in the calculation of center of mass and rigidity? is it Mass Sources we define?
Salam Alaykom brother
Nice video
I want to ask u why center of rotation differs from story to another in x direction (19 to 17)
thank u sir, you solved my assigment
Welcome 😇
Center of rigidity like center of balancing zarah when earthquake force some building..bergeser terhadap pusat massanya...
i did all that and i cant find center of rigidty on Etabs 20
Thanks
Welcome 😇
Excelente explicacion, ojala hubiera traductor
Gracias
thankx broo
Welcome
Please help me, why my design in Mass X, Mass Y, and Mass Moment of Inersia the value is 0 ?
Because I think you didn't define "Mass source"
@@civilmdc I'm experiencing the same problem. I've already defined the 'mass source,' but the values in Mass X, Mass Y, and Mass Moment of Inertia are still 0.
The values appear in the summary mass of the floor, but they do not appear in the summary mass of the diaphragm.
From where you get the table for stiffness modifiers???
ACI 318 code
@@civilmdc im looking for it but i cant find it in Aci 318-19. Correct me if im wrong thank you
@@engrgep please visit www.civilmdc.com and you will get it easily.
If you still face any issue please let me know
@@civilmdc pls mention the section and specific aci 318 code (11, 14 or 19)
Or if possible the page. Thankyou
Sir can we assign load on the diaphragm?
Yes
Hussain sir the PDF u r using to explain points can u share with me
Download link is given in the description of each video.
Salam brother when we use diagram ? When we design with seismic? Thank
W. Salam
Normally we use Slab as rigid diaphragm.
In earthquake regions low, mild and high seismic risk areas,
We use seismic Design
@@civilmdc my country not use seismic Cambodia use only wind.so we should use diagram or not brother. some designer use.some designer not use. I'm not clear about this.thank for reply.wish Allah bless you.
@@tonpove1347 I suggest , use it
@@civilmdc thank brother
Means Everytime we have to add diaphragm to every structure
Yes
Persis kaya pisang kalau dilihat tarik ke bawah..ngelengkung...pisangku enak loh panjang .....enak dimakan maksudnya...heeehhhh
had to watch a few videos to find how to tick the "Calculate Diaphragm Centre of rigidity" ticked on until I found this.
Thanks
what does it mean if XCR and YCR doesnt show up?
X center of rigidity... And y center of rigidity of building
@@civilmdc Sure.. But i run the model with floor diapraghm assigned, when i show table of Center of Mass & Rigidity, XCR & YCR are showing blank cells (no number). There is only XCCM and YCCM which mean center of mass..
do you have any idea what does that mean? thank you bro
@@IchsanulIqbal-yv2ip you have to go to analyze option
>set load cases to run
>tick calculate diaphragm Center of rigidity ( its zero because you forgot this step)
Xcm and ycm show on the able but xcr ycr don't show,what do i do????!
Why Mass X and Y is showing "0" in my analysis
Because you didn't define....
Mass Source
@@civilmdc I did all the steps. Define>Mass Source>Modify>Specified Load Pattern>Load Pattern. Still its showing "0". I have assigned semi-rigid diaphragm. Does it have any effect?
ok. I have got my answer. The center of rigidity is only applicable to rigid diaphragms. Thank u
Mohaiminul Haque hey I have that issue too. How to fix it ? Please tell me.
@@vd4395 Center of rigidity is only applicable to rigid diaphragms because in-plane slab deformation is variable across laterally loaded semi-rigid diaphragms.
we need advanced lectures
Here is the full course link
th-cam.com/play/PL0h14oMuZXQ5PXbux0l80ox-8gPwcBl5c.html
Tambahin yang ada translate bahasa indonesianya. terimakasih
Xcr is not showing
@3:41 press Calculate Diaphragm rigidity
@@civilmdc i did but still not showing i don't know why
Same for me did you find it how to solve it