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11 Shear Design in beams - How to design shear reinforcement | Eurocode 2 Concrete Design TUTORIAL
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- Опубліковано 16 сер 2024
- Dr Jawed Qureshi explains shear design in reinforced concrete beams. Learn how to design shear reinforcement/stirrup/shear links. This video is part of the Eurocode 2 Concrete Design lecture series.
Not designing a concrete beam for shear force can lead to sudden brittle failure. We want beams to fail in a gradual, ductile manner. Often, stirrups - shear links or metal loops around the top and bottom steel bars in concrete beams - provide shear resistance. Ensuring RC beams fail in flexure gives us warning and significant deformation before they fail. In this tutorial, I’ll cover the shear design process according to Eurocode 2 using a practical example on reinforced concrete beams.
Link to lecture slides: tinyurl.com/JQ...
⏰ TIMECODES ⏰
00:00 - Introduction
01:04 - Problem
01:24 - Link to design of tension bar
02:05 - Formulae for shear reinforcement & link to theory
03:03 - Design shear force (Ved)
04:33 - Shear resistance of concrete (VRd,c)
10:03 - Shear resistance struts and ties
12:52 - Diameter and spacing of links
Watch Eurocode 2 Concrete limited series at tinyurl.com/JQ...
1 Singly reinforced beam Intro • 01 What is reinforced ...
2 Reinforced concrete applications • 02 Reinforced concrete...
3 Material properties and stress-strain curves • 03 Material properties...
04 Singly reinforced beam design - Theory • 04 Singly reinforced b...
05 Singly reinforced beam - worked example • 05 Singly reinforced b...
06 Singly reinforced beam - Example 2 • 06 Singly reinforced b...
07 Doubly reinforced beam - Theory • 06 Singly reinforced b...
08 Doubly reinforced beam - Example 1 • 08 Doubly reinforced b...
09 Doubly reinforced beam - Tutorial • 09 How to design Doubl...
10 Shear Design of RC beams - Lecture • 10 Shear design of RC ...
11 Shear Design of RC beams - tutorial • 11 Shear Design in bea...
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Disclaimer: This material is provided on an 'as is' basis with no warranty. There is no guarantee that the material will meet your requirements, that the material is error-free, that the results obtained from the use of the material will be reliable, or that any errors in the material will be corrected.
Copyright: Dr Jawed Qureshi holds the copyright to this lecture series. He is a senior academic in London, UK, with over 20 years of international experience. Dr Qureshi holds a PhD in steel-concrete composite structures from the University of Leeds and has prior teaching experience at the University of Warwick. He is currently working at the University of East London, London, United Kingdom, as a Senior Lecturer in Structural Engineering and Design.
Thanks sir, hope continue to explain eurocode -2 ( column, slab, wall). 😊
Yes, sure. Thanks for your kind support.
You can DOWNLOAD lectures at tinyurl.com/JQureshiConcrete
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⏰ TIMECODES ⏰
00:00 - Introduction
01:04 - Problem
01:24 - Link to design of tension bar
02:05 - Formulae for shear reinforcement & link to theory
03:03 - Design shear force (Ved)
04:33 - Shear resistance of concrete (VRd,c)
10:03 - Shear resistance struts and ties
12:52 - Diameter and spacing of links
thanks. I hope you will be able to do topics like wind, earthquake, raft foundation and basement walls.
Thanks for your kind suggestions. I’ve noted the topics. I’ll prepare videos in due course. Please bear with me as I prepare presentations, record and edit videos all by myself along with the full time job at a university.
@@DrJQureshi no problem, take your time. Once again your videos have helped me to transition from BS to Eurocode very easily. God bless you.
Well done, keep posting more :)
Thanks, it’s my pleasure to be of any help to you.
Thanks Sir.
It is my pleasure.
In the provided example, you have assumed a theta value of 21.8 degrees. When designing, how to decide which theta value to adopt, whether it should be 21.8 degrees, 45 degrees, or a value in between. I think people prefer using 45 degree in design since it would give the greatest Vrd,max.
You are right; for ease, many designers assume the value of theta to be 45°. However, when a beam supports a uniformly distributed load, the value of theta should be 21.8° or roughly 22°. For a beam with point loads, a higher value of theta should be used. The common practice is to use 45° for beams supporting point loads, which is the maximum value as well. In old British codes (BS110), we did not have a choice; the value of theta was fixed at 45°. Assuming 45° is the worst-case scenario, which means we are on the safe side. There is a direct formula for working out the value of theta in IStructE Technical Note 4 on "Designing a Concrete Beam". I have placed this formula in the shear design folder at tinyurl.com/JQureshiConcrete.
It is my pleasure to be of any help.
@DrJQureshi Thank you, sir. I have one question that might not be related to this topic. For the design of cantilever retaining walls, why do we use the toe as the pivot for the bearing capacity check(geo)? However, for the structural member design and detailing (str) (bearing capacity), we take the pivot point in the centreline of the base.
@@marco-mz3wx I’m not sure if I’m completely clear about the answer myself. I’ll get back to you after confirming with my colleagues.
Thanks a lot Sir, can we get lecture notes for video 4 to 11? Only see lecture notes till to video 4.
Oh thanks for reminding. I completely forgot, I’ll upload them at the end of my working day today.
Lectures are now at tinyurl.com/JQureshiConcrete
Sorry for slight delay in uploading the lectures. I've been very busy at work lately.
@@DrJQureshi Thanks Sir.