The Rules of Thumb Concrete Design basics
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- Опубліковано 6 лип 2024
- The Rules of Thumb concrete design basics are something that every engineer should know to allow them to scheme concrete structures or if you need to do a quick assessment of a reinforced concrete design. This video does not just cover your basic rule of thumb using span to depth or height to depth ratios but also provides you with rules of sizing elements about the stresses, allowing you to have the most efficient concrete design.
span to depth ratios are not for transfer structures
Reinforced Concrete - one-way Slabs
• Simply Supported Span/25
• Continuous Span/30
• Cantilever Span/8
Reinforced Concrete - two-way Slabs
•Simply Supported Span/25
•Continuous Span/40
Post-tensioning - Residential Slabs
• Single Span Span/40
• Continuous Span/50
•Cantilever Span/15
Reinforced Concrete - Beams
•Single Span Span/13
•Continuous Span/15
•Cantilever Span/6
Post-tensioning - Beams
•Single Span Span/30
•Continuous Span/40
•Cantilever Span/15
Slabs and Beams - RC Rates
Reinforced Concrete Range 110 to 160 kg/m^3
Reinforced Concrete Beams 90 to 150 kg/m^3
Post tensioning Rates
Slabs PT 4.5 to 7.5 kg/m^2
Reo 35 to 75 kg/m^3
Banded PT 4.0 to 7.0 kg/m^2
Reo 35 to 60 kg/m^3
Columns
Reinforced Concrete
•Simply Supported Height/20
•continuous Height/26
•Cantilever Height/10
Walls
•Simply Supported Height/35
•Continuous Height/45
•Cantilever Height/18
Columns Rates
Reinforced Concrete
•1% 150 kg/m^3
•2% 250 kg/m^3
•3% 350 kg/m^3
Walls Rates
•Minimum 45kg/m^3
• Average 100kg/m^3
•Core walls 150kg/m^3 to 200kg/m^3
Stress Rule of Thumb
Moment Big K M/B*D^2
•Slabs ~ 3
•Beams ~5
Shear Stress = V/A
•Slab 0.4MPa
•Beam 0.2xfc Vu max
Column and Walls
Average Loading 10 kPa to 15kPa
•Column Stress 0.4 x fc
•Wall Stress 0.15 x fc - to avoid confinement
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Chapter
00:00 Intro
00:50 Span to Depth
02:20 Rates Slabs and Beams
03:57 Height to Depths
04:38 Rates Column and Walls
05:38 Moment and Shear
07:26 Know your Loads
09:13 Stress Limits
MAN I WISH I HAD THESE POSTS WHEN I WAS AT UNI .............. DEFINETLY MORE ENTERTAINING
Hi Omar, Hope they help now. Glad that it was Entertaining. Thanks for the support.
This is a gold mine here. It's not easy to find these sort of guidelines. Thank you for sharing and being a mentor
Hi Ibrahim, thank for the support. Glad that you found it useful.
As a recently graduated engineer sifting through interviews, this is the type of informative and relevant content I need. thank you
Hi PEiN, Congrautations on Graduating. glad that I could help.
Hi Brendan,
I should say you are a legend for us. Really appreciate your help.
Hi Prabin, thanks for your support. Hope to keep delivering.
Thanks a lot for releasing this video , very helpful.
Hi Brooks, glad that you found it helpful.
Thanks for the videos Brendan, I've been looking for an Australian youtube channel in which I can definitely relate to. I'm a graduate civil engineer from Papua New Guinea and we adopt much of the AS/NZ standards and so far your videos have been really helpful! Please keep up the great work!
Hi John glad that I could help. Hope to keep delivering. Papua New Guinea would have some big earthquake design requirements.
Great video honestly, thanks for your efforts to bring us these videos 🙏🏼💯🔥
Hi Allan glad that you enjoyed it, thanks for the support.
Great video. Just found out there are rules of thumbs to almost every structural elements I can think of. Its amazing. This is really great content. I think you can make a series out of these video. A few structural members per video under 10 mins or more with simple worked examples. I had to pause a lot to write the rules down. Bless you for your efforts.
Hi Timo, I think every structural element will have some rule of thumb. Thanks for support. I also had the rules in the description work through the basics of a beam design would be good
Very helpful video. Keep up the good work Brendan 👍🏻
Glad it was helpful! Thanks for your support!
Love your videos. Wish there were somebody like this in the civil site engineering industry
Hi Nehemiah, thanks for the support. Maybe you can start one 😀
Thank You Sir 😊😊😁
Really cool video, I instantly saved it so I can easily find it in future. It would be really cool seeing this type of video applied to masonry.
Keep up the good work and have a nice day Brendan, I'm already waiting for the next video ^^
Hi Tonio, I will add masonry to the list, thanks for the suggestion. Your continued support and comments really help thanks
Great info. Thanks
Hi Danny, Thanks for the support,
Highly appreciate your video
Thanks for watching Luke
Thanks!
Hi Tom, Thank you so much; your support is greatly appreciated.
I appreciate ur efforts
Hi Dar L thanks for watching.
Awsome quality content 🙂
Thanks thirupathi
Great content& nice haircut thanks
Hi thanks for watching, and noticing the new hair cut.
Video was improved, keep it up dude
Thanks for watching, and support.
Dear Brendan, could you please produce a video on two way flat slab as to how to provide Min.reo over wall support, over Columns, adjacent to lift core and around perimeter of slab. Thank you
Excellent video . Hope you will extend the rules of Thumb to the choice and preliminary design of different foundation types .
Hi mussie, thank for watching. There will be future videos expanding more rules of thumbs thanks for the suggestion.
Appreciate this video. Would there be a significant difference in these values when it comes to earthquake designs?
Hi Sanjey, there should not be significant difference in earthquake design, of course there will be exceptions to these rule and hence you need to back them up with detailed calculations. But generally the rules should still hold.
Insightful Brenden. I really like the way you include lite comedy and variety in asking for the likes. I have couple of suggestions. Can you make a video on 1) Reinforcement detailing, like the length of bar, how it should be laid in normal and PT slabs etc.
2) Need a video on load distribution.
keep going.
Hi deepak, your support helps so much. I will add these videos to the list.
Good day. What are titles and authors of those three books?
I like to see different standards to understand their considerations for the region and expand my knowledge, this rules could be different depend on the region as well right?
Hi TheSpec, thanks for watching. It would depend on loads, but it shouldn't change much between regions. Most codes are taken from similar places and build off each other, Australian codes take parts from ACI and EuroCodes.
Brendan I am your fan from Africa. Your videos are always helpful. I have one Question regarding the spans. Which direction of the slab are we taking into consideration when we calculate. It is the highest side or the lowest or can we take a representative average of the 2 sides?
Thanks in advance
Hi Natneal, it will be the smallest side, structure will move the the stiffest path which will be the shortest direction.
Brendan, thanks very much for sharing. I'm a structural engineer too. I actually work near you. I'm in South Bank. Hope to catchup with you some day. Cheers, Vance
Hi Van, glad to hear from a fellow Melbourian. Thanks for the support.
Hi Brendan, can you please explain what Wu is in the wind loads? We’re currently doing a project for steel structures. We’ve found the pressure thru 1170.2 but when it comes to Wu, it’s confusing as to what exactly are we gonna take it as… please explain.
Hi Ayush, thanks for watching. I will plan a video on wind design, but for code specific design it would be on my patrion as I think it wouldn't far well based on the effort required.
Do you have any experience with substituting steel rebar, with FRP bar? Is that something you could talk about?
Hi Thomas, I have had some experience with FRP. Typically the failure mechanism is brittle due to the FRP., so you have increased safety factors, typically you want to have your critical case as a ductile mechanism as the structure will give you warning signs when overloaded.
Are these rules of thumb in any book/document/Eurocode? Love your videos man!
Hi Samuel you do not seem to find them is many books but you apply across most codes.
Really appreciate the effort of replying to every single comment you have 👍🏻
Really nice video you got there, can you introduce different types of floor framing system? like what is the advantages and disadvantages of them?
Hi Kai Xin, thanks for watching. Also thanks for the suggestions I will add it to the list, suggestions helps alot.
At Big K calculation, what unit we have to use? To have a better understanding? (Brazillian Engineer here, sorry for english mistakes)
Hi Eduardo, it is in mm. your English is amazing no need to apologies. thanks for the support.
👍🏻
why cant we consider the dowel action of longitudinal reinforcement in RC beams for shear?
You can in column design, but beam design it is hard as it serves several processes.
@@BrendanHasty I know the code doesn’t allow for dowel action for beams, but what if you have residual capacity from bending and torsion of the beam? Could that be used for shear?
Can you talk a little bit about secret beams /concealed beams /hidden beams... I see people using them indiscriminately to support slabs and it is causing a lot of slab failures meanwhile a drop beam would have been better.
Hi Michael thanks for watching. by concealed beams do you mean columns strips in twoway slab design?
👍🏻👍🏻👍🏻
thanks for watching and your support Civil Ideas
Yes....span........I definitely know what that means......PSH! Who doesn't know what span means???? Pff!