One Column Two Effective Length : Assign Lx and Ly

One of the most confusing concept in steel design is the assignment of effective length/factor about different axis of the column.
In this video let's learn about-
Major axis and minor axis of column,
Slenderness ratio of column,
how to design steel column,
effective length of column about major axis,
effective length of column about minor axis,
how to assign effective length factor in staad model,
concept of lx and ly in steel design,

[@yashwantrajverma]

hat's off to you, never saw such series of videos with practical example, keep making such videos for staad also with real life example pictures.

[@TonmoyMaity]

glad you like it

[@azmat_waseem]

Very Informative... Thanks...

[@TonmoyMaity]

Glad you like it

[@gauravzinjade7146]

Thanks Sir For Valuable knowledge

[@TonmoyMaity]

Glad you like it

[@aqsaneaz7904]

Pls make more videos on steel structure. Your videos are very very very much helpful. Thanks for uploading

[@TonmoyMaity]

Glad you like it

[@sarkarnabinh]

Sir, Your videos very much helpful. Can you please explain the Lx, Ly and Lz parameter for rafter and which parameter should assign for which member of structure.

[@TonmoyMaity]

🆗

[@abishak3506]

Thanks for the video sir

[@TonmoyMaity]

Most welcome

[@olamideajala687]

Nice video thanks, quick one which chart did you referenced that showed different kl/r ratio for a particular yield strength

[@TonmoyMaity]

This is IS 800:2007

[@HirenRohishaliya]

Could you please make a complete detailed video about the releases given in staad pro considering different type of structures

[@TonmoyMaity]

It's really tedious..

[@Mnbv-t1s]

Thanks for the video sir..it is really good..kindly do video on staad design parameters such as UNL UNT UNB etc..

[@TonmoyMaity]

Okay sure

[@Mnbv-t1s]

@@TonmoyMaity thanks a lot

[@stalinsubramanian251]

Now also column height is full height only if want to divide by 2 u should connect bracing at strut location.so then only from strut location bracing will transfer the load to foundation.if u dont provide bracing column will bend between foundation and eave joint only.

[@kunalbadgujar8628]

Excellent

[@TonmoyMaity]

Glad you like it 🙏

[@murtadhaabddulkareem7913]

What is the connection type btw strut and columns?

[@junaidbashirbhat]

Thankyou sir

[@TonmoyMaity]

🙏

[@aqsaneaz7904]

Pls help me understanding unt and unb also. The design parameters we use in staad

[@syedmubarak9593]

Awesome

[@TonmoyMaity]

Glad you like it

[@mdmanowwaralam6037]

hello sir, Ly and Lz parameters are only for column? or we need to define these values also in beam. Please explain.

[@joseh7612]

Beam as well

[@sachinnegi9754]

Very informative video

[@TonmoyMaity]

Glad you liked it

[@sachinnegi9754]

@@TonmoyMaity sir can you teach me design of steel structure ?? I'll pay for it.

[@HirenRohishaliya]

also you have modeled purlins also....is it mendatory to model purlins or can we simulate the effect of purlin by just assigning the value of Ly to rafter members?

[@TonmoyMaity]

No never.. don't model it..just adjust the ly

[@jainamshah1378]

Can you make a video of failure of bracing and column due to biaxial bending and shear??

[@TonmoyMaity]

I will try

[@mosalim7119]

what is the safest apex deflection limit foe portal frames thanks

[@TonmoyMaity]

It depends on your code

[@sothattheng8624]

Thanks for sharing! your VDO is very helpful for young Engineer like me, if you can make the example of steel frame column design with Autodesk Robot is good.

[@TonmoyMaity]

Great suggestion!

[@kumarshinde3065]

Sir make videos on RCC structural engineer practical concept and real work explain

[@TonmoyMaity]

i will try

[@fahimakhtar1000]

Can u plz give an example of the section whose Lx is different from Ly.

[@TonmoyMaity]

I will try to put a video on this

[@Rohit0videoz]

What about Kz value?

[@debayandebnath641]

khub bhalo buhiyecho bhai......eto bhalo dharona boi pore holo na kaj korte korte ?

[@TonmoyMaity]

Dada valo lagle ami dhonyo..dutor combination a obossoi.

[@reacharun4522]

Lx,Lz,Ly all r depends upon GLOBAL coordinate or local coordinate?

[@TonmoyMaity]

Global

[@jagadeshkola1155]

Sir how to decide the column orientation plz tell me

[@TonmoyMaity]

Please watch my video : Axis of Structure and you will get your answer.

[@abhishekbandgar5195]

If the main frame is moment connected then why have you taken the effective length as L it should be 0.65L as for moment connected frame the column is fixed on both side. And for longitudinal direction, column is pin connected so effective length is L

[@TonmoyMaity]

correct

[@lakshmipriya1676]

Thanks for posting this question. I was also having same concern .now it is cleared .

[@debayandebnath641]

join korle koto maaash dhore katbe taka ?

[@TonmoyMaity]

One time

[@jal000lx]

the lx and ly parameters are with respect to local axis of crossection , not on global axis . Please check I think there is an error in your presentation . Following staaadpro conventions , Z is local axis and is major axis Y is local minor axis X is axis along length Lz is used for buckling length for major axis Ly is used for buckling length about y axis Lx is buckling length for torsional buckling case . Usually ly and lx are same value in cases like for example the column braced by a strut in middle . But again this need not be 100 percent to true , depends on the crossection of strut and connection of strut to web of column .

[@TonmoyMaity]

My intention is to convey the concept only.