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@febryugalde4671

11 ай бұрын

Helo sir, do you have a simplified book for designing steel and concrete the easiest way of calculation?

Thank you for taking the time to make this video. It's the "step by step formula" that I've been looking for for ages.

You are literally a million times better than my college tutor Thankyou

Brilliant way to understand anyone who got basic physics. Thanks and god bless you.❤

Wonderfully simple to understand. Thank you.

@RobindeJongh

3 жыл бұрын

Thanks I appreciate it!

Thank you so much for the shared knowledge.

This is amazingly useful thank you for producing this! Do you know if any of these equations are in the Eurocodes or national annexes?

Sorry, I understood your deduction and it's correct, congratulations!

Thank's for the video.

Why is this so hard to find?! This is excellent!

Thanks For Teaching Sir

OMGOSH! Where have you been all my life? This has given me new reason to live...LOVE doing these calcs! Why couldn’t my Statics and Dynamics Professors in engineering school explain things this way?! I’m a little confused about the Moment, in school they taugh that it was Force times direction (F x Cosine or Sine theta) so if you could differentiate that for me I’d be grateful. Do you do Free Body Diagrams where you show the forces acting on a body from x, y, and z? I’d love to see that. How come academia fails to explain things this way? THANK YOU! THANK YOU!!! THANK YOU!!!

@RobindeJongh

2 жыл бұрын

Hi Carmen. Thanks for the compliment! Moment in a beam is basically a force couple, so you have an equal and opposite force in each chord, top and bottom.

Can you post a video with the complete steel truss design with size selection, defelctions, etc....?

Totally like your tutorial. And could you please guide me how to calculate the inclined and vertical member between the two main chord? Thank You so much.

@RobindeJongh

3 жыл бұрын

Thanks - I'll put it on my list

If you take I req = wL^3 you can leave w at the value per meter. This prevent you from not using the total length w and errors.

Great video!

Love this guy.

@SD_Only

3 жыл бұрын

Please Like, Share & Subscribe my Civil / Structural engineering related Channel. kzread.info/dron/BFXK9JardfdIxMcN0llolg.html

very nice i join it.thank you.

Finally I found a technical video easy to understand being a non engineer myself

Can you do a video showing how to find all reaction forces in an arch?

Can you combine trusses with arches? Would that increase the load capacity of the arch? (Not talking about suspension bridges)

Robin - the UK is crying out for a channel like this. Make a series of Rules of Thumbs for the IStructE exam

@RobindeJongh

3 жыл бұрын

Thanks Liam. I'll take that on-board!

How you consider the thickness and sizes of the angle bars in your computation?

Do you have a process you could share to do the same with regular Douglas fir wood? I would really appreciate it. Thanks!

For the configuration you drew the top chord force will be 562.5 but the bottom chord force will be less because of the diagonal web members framing into the bottom chord at midpoint.

@parttroll1

2 жыл бұрын

True but for a quick approximation it will get you in the right ball park.

@febryugalde4671

11 ай бұрын

Hello sir Do you have a simplified book for designing the easiest way?

thang you very much

Robin - Can you do a similar video with easy calculation you need to use to make a wood Truss for a flat roof. Please.

@SD_Only

3 жыл бұрын

Please Like, Share & Subscribe my Civil / Structural engineering related Channel. kzread.info/dron/BFXK9JardfdIxMcN0llolg.html

Excellent!

Hi. When working with smaller trusses for machines i found that the equation I=A*d^2/2 gives 4-10 times bigger moment of inertia than the real one (that was my statistics, the situation may be even worse). My trusses were mostly ~2 m long and ~300-400 mm deep, i needed really small deflections (l/40000)

Based on your calculation what is the deflection in mm?Do we need to put some amount of camber for such long span beam?

Hi, how do we calculate the maximum load/maximum vertical deflection the truss can take with no intermediate supports, a free effective length of 1.5m , maximum load applied at the center 5kg.

Thank you for the amazing video, here is my dilemma. I have a 30 feet span residential floor project and have a hard time to find the stell bar joist criterias using the formula and second the distance in between trusses!? You don't mind giving me more info please. Thank you

Hello, your videos have really helped me, thank you. I have a question, from your example, Irequired was 605,000cm4, so does that mean when picking a steel section to use we have to pick one with an Ix value greater than that? Like 1016x305x249 universal beam? And lastly, can universal beams like that be used to construct trusses? Sorry for the many questions, your answers would be appreciated.

@RobindeJongh

3 жыл бұрын

Once you have the required I value, you then derive the I value for the truss using the next part of the calculation in the video. I may need to clarify that in a future video.

@rayrim-rukeh1967

3 жыл бұрын

@@RobindeJongh Thank you. Also, is there a way to calculate the bending moment in a specific truss member to be able to carry out a bending resistance check?

What about the member size of internal chords ? How do we determine that ?

Hello and thank you. I would like to ask, does the I required is for one cord only or for both cord (top and bottom) added? Thank you

@caktidhewana2910

2 жыл бұрын

And one more question if you wish to answer, does the w is included with truss member itself or only the external force?

Not sure if you read these, but I can't seem to find an engineer to help with a project. I just want a truss drawing with thickness of mild steel angle iron used for the web and chords, and of course, how many triangle webs need to be inside the truss. I want to use a parallel chord vaulted truss design spanning 40 feet. I am putting a roof between two shipping containers, and need a snow load capacity of 50 psf. The perlins (span between trusses, I think they are called perlins) will be 2/4 every 24 inches connected with U channel, and I hope to get away with fabricating 11 trusses total, so every 48 inches. I would happily pay for a drawing.

@RobindeJongh

3 жыл бұрын

Hi Chris. Sure - let me know on the following contact form: docs.google.com/forms/d/e/1FAIpQLSdXAY1zbCizMIF5CbdSrSRF5dBG-H1nXEW2wBuCYdgdJk309Q/viewform?usp=sf_link

So if I do this what metal should I ask for at the builders merchants?

Thank You Robin Can we use this formulas if there is a triangular truss

@RobindeJongh

2 жыл бұрын

I don't think the formula works for a triangular truss.

Thanks sir 💐💐💐💐💐💐💐

@RobindeJongh

3 жыл бұрын

Most welcome!

Hi, Robin, can you check this? L=5.6 m, total load = 1.5Knm, sectional area (light gauge steel 2x4x0.85 = 1.27 cm2) . I=2.24*1.5*5.6^2=105 cm4. I need to find de "D" value. So for me 1.27 * 13^2 = 107. Then, I need a "D" value of 13 cm. That's correct?

Would you be so kind as to go through the same steps for a timber truss?

Can we use this formula if there is a triangular truss

Hello Robin. Thank you for your time putting this together it is really helpful. I need to ask one thing when are you calculating "I required" how cm^4 came? thanks

@RobindeJongh

3 жыл бұрын

Glad you're finding it helpful. The formula for Ireq is a simplification where I've taken the formula for deflection 5WL^3/384EI and substituted in all the units and the value L/360, which then gives me the shortcut formula.

@mohamedelmi4702

3 жыл бұрын

@@RobindeJongh Got it. Thank you very much

@alfredfungo2155

3 жыл бұрын

@@RobindeJongh How did it come to 2.24 I used how you derived the formula and what I got is 4.68

@alfredfungo2155

3 жыл бұрын

@@RobindeJongh And is this applicable for short span also?

@RobindeJongh

3 жыл бұрын

@@alfredfungo2155 Yes, it's applicable.

thank you for your video! im studying also... can i email you to ask a few questions?

How do I choose the size of bottom and top chord after the calculation

is depth the depth of the truss for the last equation?

Is this for a standard thickness of stock. Like 1/4 inch think 2x2 angle iron? It seems like the measurements of the material your using would change the equation.

@RobindeJongh

3 жыл бұрын

Hi Paul. Generally you would measure to centroid of the section, so the calculation doesn't change if you change steel size.

Ese método se conoce como analogía estructural de viga, el cortante brinda las fuerzas en las diagonales , el diagrama de momentos, se divide entre el peralte de la viga equivalente, y resulta para cada tramo las fuerzas en los cordones superior e inferior, los montantes( elementos verticales), con el cortante en cada tramo

How do I choose the size of angle section after calculation

Thanks you very much but how will determine the sizes of the size of still iron bars to be used thanks

@RobindeJongh

2 жыл бұрын

Hi Jon. I keep being asked this question and I keep meaning to do a video on it. Thanks for the reminder!

Hi Robin, thanks for this video. I think there is something wrong ! I have an objection regarding your formula: I = 2.24.W.L2 Look what I found: Deflection = L/360 must be I I I Could you explain me where is the problem ? Thanks in advance

@RobindeJongh

2 жыл бұрын

Hi. It's ^2 for total load, ^3 for a udl.

Are you using factored loads?

Hi Robin, want to build a platform for keeping 2000 Liters x 2 water tanks. Platform is approx 5 x 10 feet. Pillars will be in brick mortar and I want I beams on it to support load. What sizes of i beam and how many in numbers to use?

How do you calculate roof load on the steel

when you say area of cord say using 2X4 nomimal so 8 in square X 2 for top and bottom cord ?

@RobindeJongh

2 жыл бұрын

Hi Robert. The "A" is the area of one chord, so you would typically use the same top and bottom chord. The area is area of steel, which takes into account wall thickness and so on.

Can you refer to design manuals

Long span for hall 30m length the optimum flat structure and optimum steel type tube or angle section or c channel?

@RobindeJongh

3 жыл бұрын

Angle or c-channel back to back can work well and is easy to bolt together or weld. Circular tube needs more welding and fabrication time.

Sir, i have a doubt. How can we calculate the member forces (especially diagonal member) when udl is acting on this kind of through truss?

@RobindeJongh

7 ай бұрын

Hi. Usually we take the maximum shear and use that as the force in the diagonals. Also you can ask further here: geni.us/askrobin

Using 40*40*1.6 mm pipe. Flat truss 40 * 1.6mm pipe * 10 inches is it enough for 30 feet shed without middle support.(pillar)

Hi sir, is this still the same if we use triangular truss

@RobindeJongh

3 жыл бұрын

Hi Rimar. This method is only for parallel chord trusses.

D30/15 for long span , if short span like 8feet/15?

@RobindeJongh

3 жыл бұрын

Span / 15 is a preliminary sizing rule, to help you decide on the depth of the truss.

I want to build a lightweight trailer for my ultralight aircraft (350 lbs) , it has to be single axle and 24' long and be enclosed (arched covering). I was thinking about welding two lightweight trusses together as the main support instead of get a heavy rectangle or angle. They can't be very tall though, maybe 6" your calculation makes it 18" high and that would make the floor of the trailer too high. but two of them could be smaller maybe? what should I use, 1" square tube and flat bar maybe? I don't know if it's worth it.

@RobindeJongh

Жыл бұрын

Hi. Trusses are a lightweight solution at the expense of depth. Steel UC sections offer the opposite, a less deep solution at the expense of weight. If you have only 6" then you're limited to a UC section or Square hollow section.

@embededfabrication4482

Жыл бұрын

@@RobindeJongh they incorporate the trusses into short side walls to make these long lightweight sailplane trailers.......that's the secret!

@embededfabrication4482

Жыл бұрын

@@RobindeJongh how do we design such a truss other than simple triangles if we want to make it stronger but don't mind doing more cutting and welding?

is there an easy formula to check for the web members too?

@RobindeJongh

2 жыл бұрын

Yes there is - generally you can take the maximum shear force in the beam and check the web members for that.

I am wondering what the Ac is? The overall area of top chord and bottom chord or just counting one chord?

@RobindeJongh

3 жыл бұрын

Ac is the cross sectional area of one chord, if the chords are equal size.

@brian8534

3 жыл бұрын

@@RobindeJongh thx.. Got it

@paddymcginley

Жыл бұрын

@@RobindeJongh and how does this work for ub's or uc's?

Hi Robin . I need some help in truss building

@RobindeJongh

3 жыл бұрын

Do you mean with calculations, or construction?

Is this specific for steel trusses? Or any type of truss?

@RobindeJongh

3 жыл бұрын

Same kind of thing with timber trusses also. The deflection formula is different.

@FreeFinancialSelf

3 жыл бұрын

@@RobindeJongh Got it. Thank you!

7:04 how to we get this Aₗ?

Hello, is (I required) = 2.24 W L^2 or is it 2.24 W L^3. As in your video "How to do a steel beam calculation Part 4, you used the formula I required = 2.24 W L^3 so I am confused which one is correct. Please could you reply at your earliest convenience as I have a close deadline.

@RobindeJongh

3 жыл бұрын

Hi. The difference is whether you use w for kN/m or W for kN, in other words total load. So ^2 if you use total load (big W) or ^3 if you use a UDL (kN per m).

@rayrim-rukeh1967

3 жыл бұрын

@@RobindeJongh Thank you

@rayrim-rukeh1967

3 жыл бұрын

@@RobindeJongh Is there a formula, to calculate the deflection of a truss, so It can be compared to the formula deflection has to be less than span/360? so the truss can be proven as satisfactory

@RobindeJongh

3 жыл бұрын

@@rayrim-rukeh1967 Hi Ray. Yes, if I remember rightly that's covered in the video.

@rayrim-rukeh1967

3 жыл бұрын

@@RobindeJongh hello, if you did I can’t figure out which one it is. Please could you help?

can you derive how you get 2.24wl2?

@RobindeJongh

Жыл бұрын

I could but it would be pretty boring 🤣. Essentially, you take the formula for deflection, and then substitute in all the normal values, and then rearrange it. It uses the deflection as span/360, youngs modulus of 205,000.

How do we know load (w)

@RobindeJongh

3 жыл бұрын

Check out part 1 of my steel beam tutorial.

I didn't quite understand how the 2.24 came about. You stated l over 360. Is that 30 divided by 360? Because I get a complete different number than the 2.24?

@RobindeJongh

4 ай бұрын

It's a shortcut formula for deflection that has been developed taking into account youngs modulus and the allowable span to deflection ratio.

@RomboutVersluijs

4 ай бұрын

@@RobindeJongh but where does this 2.24 come from? If look online I see L/360 and than see actually same number as me. Aslike 30/360, as the distance oenght is 30m

@RobindeJongh

4 ай бұрын

It’s literally a page full of calcs to get to it.

@RomboutVersluijs

4 ай бұрын

@@RobindeJongh ow I didn't get that. I'm sorry

what is meant with "Area of the chord" ?

@RobindeJongh

10 ай бұрын

Hi. It's the cross section area of the steel section that is used.

@znerol1

10 ай бұрын

@@RobindeJongh So in this example the unit of 'A' would be square centimeter and the unit of 'D' would be centimeter in order to receive a value comaparable to the 'Ireq' from the previous formula which results in cm cubed, right?

Things you need to do splice calcs How to specify a conc beam and column Preliminary calcs

@RobindeJongh

2 жыл бұрын

Thanks Usman for these great suggestions 👍

@usmanali-ze1vg

2 жыл бұрын

@@RobindeJongh your welcome can you also do a video on general structural engineering formulas which are handy to know. Will you be running your course anytime soon

wait how to find the total load? why did you multiply 30 by 10?

@RobindeJongh

2 жыл бұрын

30 x 10 is the total load if the truss is 30m long and has 10kN/m on it.

What is ratio to get 15?

@RobindeJongh

3 жыл бұрын

Span / 15 is just a rough guide to how deep a truss needs to be. Use it as a starting point, no more.

at 5:16 the general equation is I_cm^4= 5e8*f*wL^3/(384*E),hahaha

I=2.24*wl3

Lástima, no hay traduccion en español

hi there can I get some help with calculating stress that steel can hold as horizontal and vertical load? thank you very much if yes or no - would appreciate the yes :P and how can I get in contact with u plz?

@RobindeJongh

3 жыл бұрын

Hi. Check out my 4 part tutorial on beam design kzread.info/head/PLJ7yQ-oWQGLRH8DjtJeq--2I1VKJFUQTq

Where is the application of the value of M and F in this calculation?

Hi sir i want help i am doing fabrication work in India i want steel structure idea

How to find Ac

@khievsatya3115

3 жыл бұрын

Area of the chord

@RobindeJongh

3 жыл бұрын

It's the cross-sectional area of the steel section, which you can find here: www.steelforlifebluebook.co.uk/hfshs/ec3-ukna/section-properties-dimensions-properties/

if the truss shape is triangular the depth should be measured at the center of the truss # 🇵🇰

good but U said depth formula is truss span devided by 15 or 18 ???? there should be one denominator either 15 or either 18 otherwise depth will be changed # 🇵🇰

@RobindeJongh

Ай бұрын

Span/15 is not a formula, just a rule of thumb to help you decide what initial truss depth to try. The formula is later in the video.

Why not splice it

👍😇🤗🙏

F=M/d, not M/L

Confusing

the video is good, but the formula is wrong, the right Ireq=w.L³

Please, explain how to place such a beam-angle up, or down? kzread.info1xxh2YzwlU0?feature=share Thank you!

As you described as a simply supported truss, it is subjected to the maximum moment of wL^2/8. The design max moment is located exactly at the center span. You considered the top and bottom chords at the center span as lone couple structural elements resisting the moment but strictly they are not. You disregarded the resistance to moment the diagonal member provides. This fact renders your entire design calculation inaccurate.

@RobindeJongh

2 жыл бұрын

Good points but I respectfully disagree. This is an incredibly simple calculation that gets a 98% correct force in the top and bottom boom, and is slightly conservative. That's an amazing win if you don't have software to get you the final 2%.

@edmarferreirajunior724

2 жыл бұрын

It's not the cords that resist the moment, it's the beam, because the truss is just a beam, that is, an element subject to a binary of forces. The path of the forces constituting the binary along the beam is what matters for the truss...

Not sure why nut it is angering when you or anyone uses only metric or only imperial SAE etc.. mesuments. Do both. Yes we know KN in the US and occasionally use them. Butdam. It is in my opinion uncool not to include both even if KN or metric is better.

@RobindeJongh

2 жыл бұрын

It's a good point, Jim, and one I have thought about a lot. It's a global audience watching these videos and here I am using only metric and alienating half my audience! To some extent I think metric is simply better and that people should learn to use it, but at the same time I realise that is not going to happen. I have actually never done calculations in imperial so that would also be totally alien to me. Any suggestions as to how I could be inclusive to those using imperial would be genuinely appreciated. 👍

CAN I USE OUR INDIAN COUNTRY ? IM FROM INDIA

@RobindeJongh

2 жыл бұрын

Hi Pragati. It would be suitable in India or anywhere, as long as the local building control accepts your calculations. Local variations might be in steel grade (it's usually S355 or S275 here in the UK) and in the safety factors used.