Design of channel section purlin

[@s_hubh78]

Also is it necessary to calculate plastic modulus along the y axis

[@vasu4628]

From where u taken the value of zyy

[@nicholaskaputo6059]

When finding the load due to sheets and the live load it is not necessary to multiply by one (×1m) because (0.5kN/m² x 1.8m) will give =>900N/m.......multiplying by one (×1m) wasn't necessary......please check through your work again

[@kiranchaudhari7580]

you have to calculate Zpy along y axis by using the concept sumation of AY . Zpy = Iyy * shape factor is that correct ?????

[@symphony2003]

yeah, i was also thinking the same. and it is satisfactorily enough as it doesnot fails during check for combined bending. so ig it is safe to use safe factor. why to do more while we can short out easily?

[@ramgirishanmukh4643]

Thank you...

[@akashdarwatkar9068]

Sir, How find following component angel / channel selection 1) main tie = ? 2)principal rafter = ? 3)sag tie = ?

[@Civillearningonline]

Hello dear, Your question will be clear form the diagram of a roof truss. And for that i need to add a video about it or u can consult some book like s.s. bhabikatti.Choice is yours if you want me add a video then let me Know by replying this comment. And i would like to thank for your comment.

[@Civillearningonline]

Here is your answers kzbin.info/www/bejne/hXmpoqWvbZJ9b9k And i m extremely sorry for being late

[@piyushvaishnav18]

SIR CALCULATION OD LOAD ME 1.8 KYA HAI PLEASE REPLY

[@symphony2003]

hi, 1.8 is there because of spacing of purlin is 1.8Meters. it should be multiplied to gain the parameter in KN/m.

[@FinanceTalkWithDileep]

I have supply 😍😍🤩🤩

[@ganeshyadavflashgaming3286]

Sir in calculation of required zpz u have not used ymo(1.1) after myy/fy

[@Civillearningonline]

If it's present in formula then it needs to be used otherwise not.

[@ganeshyadavflashgaming3286]

@@Civillearningonline in previous problem u have used that's why I asked sir

[@Civillearningonline]

Yes, it id missed . We need to multiply it with ymo( 1.1). Thank you.

[@s_hubh78]

Why didn't you calculate shear capacity

[@Civillearningonline]

This video was made from the exam point of view so that all thr important steps can be completed and students can get full marks.

[@s_hubh78]

Thank you sir Yours way is the easiest I have seen

[@s_hubh78]

There is another question sir If only dead load is given Do we need to calculate the factored load?

[@Civillearningonline]

Yes if we are provided with dead load only then we have to take live load load 100N/m and wind load will be given in the question. And after taking all those loads we need to multiply those loads by factor of safety as shown in the following video. And after doing so we proceed our solution. Hope i met your confusion. Have a nice day.

[@s_hubh78]

Thnks a lot sir

[@abarajitharamachandran1866]

Sir what if pitch is given as 1/4 and angle is not given

[@Civillearningonline]

Hello dear, When angle is not given then use the formula Tanx=(height of truss/half of span of truss) Or, U can watch my video on the design of channel section where i have mentioned this formula in the description go and check it out. Thanks for ur comment.

[@abarajitharamachandran1866]

@@Civillearningonlinethank u so much sir....

[@abarajitharamachandran1866]

@@Civillearningonline sir but in this sum they didnt given the height of truss too... They only gvn the spacing , span, pitch as 1/4

[@Civillearningonline]

We have a formula i.e. Pitch(p)=height(h)/span(L) Or, Take assumption as x less than or equal to 60. For making the design economical value of x is taken between (20 to 30) degree.

[@abarajitharamachandran1866]

@@Civillearningonline tysm sir.... U r really best.... Thnks fr ur response...

[@keerthanav410]

Sir where did you find the shape factor

[@symphony2003]

is 800:2007 annex H , plastic properties of beams

[@-Thimmaraju]

Nice

[@yeshwanthgurrapu2421]

y u used WL SQUARE 2/8

[@Civillearningonline]

That's the formula to find moment in case of UDL.

[@Civillearningonline]

Always keep in mind; Whenever live load comes either with dead load or singly we consider it as UDL.

[@ashoks8084]

Sir if any check is not satisfied do we need to redo then What section want to choose

[@Civillearningonline]

Hello dear, U need to redesign the section only if your section fails at the beginning of the solution of the Numerical from the exam point of view. Otherwise you can mention that "the section fails and we need to redesign taking another section" if it fails at end.. And as far check is considered " one can mention that the given section fail here".

[@Civillearningonline]

DCS and DSS are design subjects and one just needs to know the proper steps to design a section for exam. And one becomes best in selecting the proper sections through practice. The more you practice the more u learn. Now a days all sections are designed through different softwares like ETAAB, STADD PRO. Where there is need to do so much lengthy calculations nor to apply checks. One just need to enter the data and the section is designed by the software. So don't worry just prepare well for your exam. Best of luck.

[@ashoks8084]

Thankyou sir

[@alkasingh5098]

Op

[@Civillearningonline]

??

[@ahmedilyas3014]

which code is being followed??

[@Civillearningonline]

It's indian standard code. Is 456 2000.

[@ahmedilyas3014]

ok i got it is 800 . thnks

[@vikashmahato272]

bhai hindi me hi smjhao english jabardsti kyo bol rhe ho hindi sb psnd krta h

[@Civillearningonline]

Ok bhai. Thanks for your suggestion.

[@manishkumar-pv5rl]

How to find Zyy

[@Civillearningonline]

In order to calculate Zyy. First you need to find MOI about y axis and then divide it by half of width.

[@manishkumar-pv5rl]

In this question you donot find moi then how to find zyy

[@venkyrce]

Simple- zpy = a×y,where y is centric distance to yaxis

[@venkyrce]

a = area of member

[@AJAYKUMAR-ul8im]

In a steel table rolled steel channel the zyy=zey

[@shornashomebaking5456]

Not audible

[@Civillearningonline]

Sorry for inconvenience. Please use earphone.

[@pkentertainments20]

Please improve your voice

[@Civillearningonline]

Ok. I will.