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Please explain in even more detail. I like your explaination. Like in stiffness modifiers you explained why values 0.7 is taken. But please explain further if we take value of 0.8 what will happen.because if we consider concrete take some fraction of tensile load what will happen , what values should we take ??
The primary function of modifiers is related to the Bending Stiffness of member. Stiffness is product of Modulus of Elasticity(E) and Moment of Inertia(I). Since we do Cracked Section Analysis in RCC Members (non-prestress), the effective cross section area is reduced and which would eventually reduce the Moment of Inertia(I). That's why we use 0.35 Ig (gross moment of inertia) for beam or 0.25Ig for Slab to account for that reduction in cross section area or eventually moment of inertia which is function of Cross section area. Thanks
Appreciate your efforts but you made mistake in explaining to property modifiers. The primary function of modifiers is related to the Bending Stiffness of member. Stiffness is product of Modulus of Elasticity(E) and Moment of Inertia(I). Since we do Cracked Section Analysis in RCC Members (non-prestress), the effective cross section area is reduced and which would eventually reduce the Moment of Inertia(I). That's why we use 0.35 Ig (gross moment of inertia) for beam or 0.25Ig for Slab to account for that reduction in cross section area or eventually moment of inertia which is function of Cross section area. Thanks
Helo sir I am very much confused abou torsional modification factor. In general some engineers are used 0.001 as torsional modification factor. Sir i need a authentic code reference of that practise.
If you want to use the torsional capacity of section then you can use the torsional stiffness modifier 1. If you don't want to use it.... Then use 0.0001
AOA. WE ARE SHIFTING CONSTRUCTION FROM NORMAL RCC FRAME COLUMN BEAMS TO PT FLAT PLATE AND PT FLAT SLAB. HOW TO DRAW DROP PANELS OVER THE INTERIOR COLUMNS IN SUCH STARTING FROM GRID LAYOUT + HOW TO DRAW SLAB PROJECTION ALL AROUND. + HOW TO DRAW BALCONY SLABS. REGARDS.
@@civilmdc thank you. I would like to ask again, If I assign the slab (shell) as a rigid diaphragm for assigning the wind and EQ load, does it still require to change the stiffness modifier or designe the structure according to changed stiffness modifier??? And should not I also change the torsion constant in beams and columns??
@@samiulislamniloy6785 Yes... Modifiers are must.. 2nd Torsion constant is used 1.... It is changed based on equilibrium Torsion and compatibility Torsion.
@@civilmdc If SM is always required in design then @5:28 time, in the last line, why it is written that "for both cases fxx is not important if rigid diaphragm is assigned". What does this line stand for?
For the concrete column section you choose ""selection shape" as steel channel, wouldnt it be ok if we choose Concrete Rectunglar instead of steel channel. in this video 02:02
I have checked...... as you mentioned at 02:02 minute...... Dear it does not matter what "selection shape"..... I have selected from Concrete box...... you can try ... you will not face any issue...... And further you can check i put in the section all the material as per concrete section.... Result...: It will not effect. If you still have any question ... please feel free to ask.....
To make a RELATIONSHIP, Don't forget to press the subscribe button with bell icon to get the latest notifications. My channel :)
th-cam.com/channels/w9kSuR1bTFBmaMEyD_DXvQ.html
Please explain in even more detail. I like your explaination. Like in stiffness modifiers you explained why values 0.7 is taken. But please explain further if we take value of 0.8 what will happen.because if we consider concrete take some fraction of tensile load what will happen , what values should we take ??
The primary function of modifiers is related to the Bending Stiffness of member. Stiffness is product of Modulus of Elasticity(E) and Moment of Inertia(I). Since we do Cracked Section Analysis in RCC Members (non-prestress), the effective cross section area is reduced and which would eventually reduce the Moment of Inertia(I). That's why we use 0.35 Ig (gross moment of inertia) for beam or 0.25Ig for Slab to account for that reduction in cross section area or eventually moment of inertia which is function of Cross section area. Thanks
is that obligatory to use SM for all structural members all the time for RCC design?
20, 20 longitudinal & corner bar is not available in add new property
2#,3#......9# etc are available
what should i do ??
Learning alot from yuor videos
Thanks Buddy
very good series, but i want to know where to choose rebar material for slabs. Plz reply
Appreciate your efforts but you made mistake in explaining to property modifiers. The primary function of modifiers is related to the Bending Stiffness of member. Stiffness is product of Modulus of Elasticity(E) and Moment of Inertia(I). Since we do Cracked Section Analysis in RCC Members (non-prestress), the effective cross section area is reduced and which would eventually reduce the Moment of Inertia(I). That's why we use 0.35 Ig (gross moment of inertia) for beam or 0.25Ig for Slab to account for that reduction in cross section area or eventually moment of inertia which is function of Cross section area. Thanks
Noted with thanks 👍
Acc to ACI, torsional constant it is considered as 0.35 and 0.7 for beam and column respectively. why is it 1 here?
How can we neglect for column below neutral axis? For beam it's okay beam is a flexural member . Please explain
Helo sir
I am very much confused abou torsional modification factor. In general some engineers are used 0.001 as torsional modification factor. Sir i need a authentic code reference of that practise.
If you want to use the torsional capacity of section then you can use the torsional stiffness modifier 1.
If you don't want to use it.... Then use 0.0001
Very helpful Lecture Thanks Sir
Welcome
AOA. WE ARE SHIFTING CONSTRUCTION FROM NORMAL RCC FRAME COLUMN BEAMS TO PT FLAT PLATE AND PT FLAT SLAB. HOW TO DRAW DROP PANELS OVER THE INTERIOR COLUMNS IN SUCH STARTING FROM GRID LAYOUT + HOW TO DRAW SLAB PROJECTION ALL AROUND. + HOW TO DRAW BALCONY SLABS. REGARDS.
What sort of support (like fixed or hinged) we should use for a Concrete frame building (with reference please).
Fixed support
For reference.... Read some structural analysis books...
Regarding Equilibrium
@@civilmdc Thanks a lot. I've one confusion concerning use of membrane/shell Thin/Shell Thick. Please....
is there a difference between A615Gr60 & A615 Gr60-1 ?
i selected the first one because 2nd is not defined in my software
Same..
Brother when we have to chose shell thin and shell thick?
where I find stiffness modifier in BNBC??? Should I use stiffness modifier before every design of concrete??
You have to check by yourself....
.... Stiffner modifiers is compulsory for Concrete Design
@@civilmdc thank you. I would like to ask again, If I assign the slab (shell) as a rigid diaphragm for assigning the wind and EQ load, does it still require to change the stiffness modifier or designe the structure according to changed stiffness modifier??? And should not I also change the torsion constant in beams and columns??
@@samiulislamniloy6785
Yes... Modifiers are must..
2nd Torsion constant is used 1....
It is changed based on equilibrium Torsion and compatibility Torsion.
@@civilmdc If SM is always required in design then @5:28 time, in the last line, why it is written that "for both cases fxx is not important if rigid diaphragm is assigned". What does this line stand for?
@@samiulislamniloy6785 m11 m22 m1w are main modifiers....
Slam, How can we import frame section from AutoCad, please.
For importing any type of section for AutoCAD, Please see this video... th-cam.com/video/RfGlbzkw36I/w-d-xo.html
For the concrete column section you choose ""selection shape" as steel channel, wouldnt it be ok if we choose Concrete Rectunglar instead of steel channel. in this video 02:02
I have checked...... as you mentioned at 02:02 minute......
Dear it does not matter what "selection shape"..... I have selected from Concrete box...... you can try ... you will not face any issue......
And further you can check i put in the section all the material as per concrete section....
Result...: It will not effect.
If you still have any question ... please feel free to ask.....
Sir please tell us what is the stiffness modifier as per indian code
Stiffness modifiers are almost same in every code
IS 456:2000 does talk about stiffness modifiers
... But it didn't specify...
You can ACI....
Beacuse it's basic philosophy of design
You mean We can modify by using ACI code while we design as per is 456: 2000
@@mdshahebaz9567 Dear, it is must for modifiers....... please discuss with any your expert teacher.
Can u please suggest me as my teacher
Sri make some videos on detailing plzz
Here is the full course link on CSI ETABS,
th-cam.com/play/PL0h14oMuZXQ5PXbux0l80ox-8gPwcBl5c.html
See the detailing video