CSI ETABS - 03 - define Mass Source (For Lateral analysis) | Part 9
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- เผยแพร่เมื่อ 9 ก.ค. 2024
- For Code ASCE 7-16 Minimum Design Loads and Associated Criteria for Buildings and Other Structures
Download: civilmdc.com/2020/03/09/asce-...
In this video, how to define mass source for earthquake (seismic) design for the calculations of base shear (lateral forces).
MASS SOURCE :-
Use the Define menu --) Mass Source command to access the Define Mass Source form.
The Mass Source area has the following options:
Element Self Mass option.--))) Each structural element has a material property associated with it; one of the items specified in the material properties is a mass per unit volume. When this check box is checked, ETABS determines the building mass associated with the element mass by multiplying the volume of each structural element times its specified mass per unit volume. This is the default. Also, if the link properties have been assigned to a joint or frame object, ETABS also includes the mass and weight as specified in the link property definition (see Link Properties)
Additional Mass option.--))) It is also possible to assign additional mass to account for partitions, cladding, and so forth. (See Additional Area Mass, Additional Line Mass, and Additional Point Mass.) The additional mass is applied to each joint in the structure on a tributary area basis in all three translational directions. Note that additional masses can be input as negative.
Specified Loads Patterns option.--))) Specify a load pattern combination that essentially defines the mass of the structure.In this video as per code seismic mass source (Effective Seismic weight) has been defined.
** Include Lateral Mass check box. If this check box is checked, assigned translational mass in the global X and Y axes directions and not in the Z- Direction
** Include Vertical Mass check box. If this check box is checked, assigned translational mass in the global Z axis direction only
** Lump Lateral Mass at Story Levels. check it because of basic theory of lump mass approach.
Reference CSI Technical Knowledge Base
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Is it possible to get the pdf
@@bilallechvien4558 do you want pdf of code file.... please your email id.
Thanks for the efforts you made. Pls Keep it up.
please explain in detail where the box "adjust diaphargm lateral mass to move mass " is to checked while defining mass source in static as well as dynamic earthquake analysis. I will highly be obliged
Thank you
JAZAKALLAH
THANK YOU.....I defined the mass source in ETABS2016 but it did not calculate the self-weight? Mass X
tonf-s²/m,
Mass Y
tonf-s²/m, XCCM, YCCM all show ZERO?? how can I fix this.
You're welcome...
Go to Define.. Mass Source... Then define all the parameters... As shown in the video...
2nd also.. Define the earthquake load pattern
Then again check.. All values will be shown..
Code ASCE 7-16 Minimum Design Loads link is not working here either could u plz share it
what happens if we uncheck "lump lateral mass at story levels"? and what is "lateral mass" and "vertical mass" in options "include lateral mass" and "include vertical mass"? can you elaborate that with examples? And thank you very much for such a nice video!
For dynamic analysis or Earthquake analysis, ..... The whole story weight assumed to be considered at story floor level.... that is called Lumped mass approach.... Now this lumped mass can displace in X, Y and Z direction ........ (For X and Y... it is called Lateral lumped mass and for Z it is called vertical mass.....) ...................For earthquake analysis 95 % chance is only lateral components matters, so that is why ..... we click lateral mass......
God bless. 💕💕
Thanks
thank you for the video sir!! i have a question for "Adjust diaphragm lateral mass to move mass centroid by". As per ASCE-7, I remember we need to add 5% of the building dimension perpendicular to the applied seismic force. Also called Accidental Eccentricity. So is the "Adjust diaphragm...mass centroid" button for this?
Yes,
@@civilmdc thank you for the answer!
When should we define mass source?? Before analyzing the model or after analyzing and before calculating seismic Base Shear only???
Dear, it is discussed in the video.....
If you do not need to consider seismic effects.... then no need of mass source.
@@civilmdc Dear sir, What is lump lateral mass in storey level? could you plz describe in more details?
How about water load?
how about BS or EURO codes ? Im not able to found it in the codes
That is present in every code.
You have to see the dynamics chapter
what's the minimum multiplier for dead load sir
It is as per code...
1.2 Dead
Thanks
Welcome 😇
@@civilmdc I would like to ask your help at something very important in Etabs, well, after designing the ribbed slabs the symbol of direction (arrow) in wich the loads are distributed has not been displayed, I tried many times to display it but not successfully, in your opinion what could be the problem, because I have got to check the right direction of the ribbs and also what does consider the axis 1 2 and 3 according to colours ?
Thanks in advance
Tex u