Column buckling example problem #1: both ends pinned

[@ENGINEYEARTN]

superbly explains

[@hanmingluan923]

That helps a lot to my project. Thanks.

[@Engineer4Free]

Awesome, glad to hear it!!!

[@fajrilhanif8291]

ty sir great explanation

[@Engineer4Free]

Most welcome =)

[@wsade1]

About E - modulus value, is it the compressive yield strength, Tensile young's modulus, or flexural modulus ? thanks

[@faizatulliaza9658]

Hello sir, good evening, I want to ask is it the number for factor of safety is fixed to 2.5?

[@Engineer4Free]

Hey Faizatul, yes in this example, the Factor of Safety is specified, at 2.5

[@nayabahmad9312]

Dear Sir.what would be the coneection type in the electric transmission pole? How to calculate the effective length in the electric pole?

[@Engineer4Free]

Would be considered a fixed rigid connection

[@nayabahmad9312]

@@Engineer4Free Sir, what would be the Eulers factor in this case.

[@joaago1]

this is for an ideal euler beam right? Otherwise you'd have to solve a differential equation ?say you also had a distributed load aswell, then it'll be a non-homogenious diff. eq, do you have such an example?

[@Engineer4Free]

All my column examples can be found in videos 50-56 here: engineer4free.com/mechanics-of-materials Each one pretty much just compares the yielding and buckling limits for axially loaded columns.

[@joaago1]

@@Engineer4Free didn't think I'll get an answer so quickly, thanks! Your videos are amazing and are helping me alot during my studies.

[@muhammadaimanbinyusop2984]

Hi sir. Is that yield stress is fixed for normal concrete? Because now lab is closed during pandemic then i cannot go to lab to check my concrete properties

[@nomipakistanli]

when the column buckles in Iy moment of inertia then the plane should be X-Z ? u were saying that the moment of intertia in Ix causes to buckle inx-z plane.. i think it shud be y-z plane. plz reply..

[@Engineer4Free]

Hey Numan, when buckling occurs in the yz plane, that means the colunm will physically deform towards the positive or negative x direction. when buckling occurs in the xz plane, the column will physically deform towards the positive or negative y direction. The way you need to think of this is as if this was a beam bending problem that is just rotated into a column. With horizontal beam bending problems, you have bending, in the vertical direction, and you take the moment of inertia of the cross section of the beam using a horizontal axis that the beam essentially bends about. With buckling problems, the axis that you base the moment of inertia on is parallel to the "axis" that the column will buckle about (which is perpendicular to the actual direction the buckle "moves" in. It's kind of confusing, but I'd recommend brushing up on beam bending problems, you can watch videos 22-28 here: engineer4free.com/mechanics-of-materials and then also videos 50-56 on that same page. After watching all, through repetition, it might be easier to recognize which moment of inertia you need to use.

[@nomipakistanli]

dear Engineer4free. i checkeed the comment from an other video. thanks though for the reply. it will be great if u make an other video to make us understand. as everyone is having the same problem. :( OR maybe u can reccommend me some links or pages so that i can go and check my concepts.. maybe some prblems about Ix and Iz. THANKKKKKS. U CAND SHARE IT HERE WITH ME... OR IN MY EMAIL. [e-mail]

[@e.a.m.structures4931]

Sir Good Day, I just watched your Video Now, 09/08/2019. Can I ask the Unit measure of your column a & b is in millimeter? or it should be in centimeter? Thanks in Advanced...

[@Engineer4Free]

It's just an unrealistically skinny column lol, should have probably made it bigger... but the mm measurements is correct.

[@dafersaed5781]

Good

[@Engineer4Free]

Thanks Dafer! =)

[@abolfazlnajafi]

Hi, can you share a video that how to calculate critical load for a beam-column with a uniform loading on it? Thank you.

[@Engineer4Free]

Hey sorry I don't have a video on that particular set up. All of the beam buckling videos that I have are videos 50-56 here: engineer4free.com/mechanics-of-materials

[@benhardy6167]

Big fan

[@gordonlast2427]

How will it buckle when 5.9kn is less than 80kn allowable? Nvm I forgot you mentioned it can buckle before yield and yield before buckle.

[@Engineer4Free]

👌

[@afraid2losebalance303]

Is this a simple or standrad cross section ?

[@Engineer4Free]

it is a rectangular cross section 20mm x 40mm, uniform along the length, uniform material.

[@rencymalabanan3121]

Hi, I've been wondering is this formula applicable to hollow tube?

[@benhardy6167]

I believe it is, but you’re going to need to properly calculate the moment of inertia for that shape.

[@prateeksharma2490]

sir, did u make the videos on beam buckling and stability of plates also.. if no.. then plz make it and upload it.. it will help me and other person too..

[@Engineer4Free]

Hey Prateek, all of the beam buckling videos that I made can are videos 50-56 here: engineer4free.com/mechanics-of-materials

[@petergcda9645]

At three minutes you mean yz plane

[@rocastleasingrobertmunang6380]

Where is 1/12 comes frome .. i need answers

[@kalyankarsandeepkumar3530]

need ur voice is high