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Padstone Design Example for Beam Forming an Opening - Structural Engineering
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- Опубліковано 15 сер 2024
- In this video I will go through an example on how to design a padstone for when the beam is spanning parallel to the wall when you are forming an opening in a wall.
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#structuralengineering #padstonedesign #wallopeningsinmasonry
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Thanks for this!
A typical detail I use is to sail the beam over onto a few steel shims located centrally on the padstone and this takes away the additional stress induced due to the eccentric load!
Love your videos!
Yup definitely a good solution I’ve used before too 👍👍
Please do a video of a padstone design in the Eurocode Method. Thank you your videos are so helpful so this will be very helpful aswell please as i so struggle with understanding the Eurocode method
As a builder I’ve stumbled across your channel and it’s very intersting, thank you and keep up the good work 🙌🏻🙌🏻
Hi please do Eurocode please
Been waiting for this one Daz! Thank you
Great example! Will be using the same method in my calcs tomorrow!
hey buddy your video help me clarify when and how to apply Bearing type 3 when designing using BS5628-1-2005. very useful indeed . In some non - SIP projects I occasional come across with large opening extensions. I created a program using python to automate the stress bearing checking. I will create an executive file version and email it to you, you may have some curiosity or interest in using coding for youR daily calcs. Tedds is not for me although I have used it before. Licence is quite expensive and Tedds makes us lazy.Thanks Lad.
Thanks, very usefull videos. i would also be interested in eurocode version 😊
The resultant force is outside the middle third of the padstone so I don't think the formula you use to check the maximum stress is correct. Because of this you have a triangular distribution of stress under your padstone with a maximum stress of 6.67N/mm2
What is the reason for using 100mm or 200mm bearing. Can we not do 250 or 300mm bearing on 440 mm long lentil?
Nice video! :)
The beam reaction shouldn't be applied at 1/3 of the beam bearing?
Thanks for your sharing . How about if the wall is existing masonry wall, what will be the compressive strength for existing masonry wall?
If you were doing this properly, you need to get wall sampled and tested.
On a smaller project, can be safe to assume a lower strength block. Something like 3N block
Your initial calculation at approx 4min 24sec identifies that you also have a negative (tension) presssure of 1.07N/mm2 under the padstone but you do not explain how this is accomodated.
If this padstone was close to the top of the wall then you could not allow this tension and would have to use middle third law for padstone.
Also a padstone that was subject to bending tension within itself would likely need to be designed to resist same.
It is probably better to start off with a lintel bearing length and padstone that adopts the middle third rule and thus remove the problem you have introduced of tension under the padstone and within the padstone that has not been recognised, discussed or dealt with in your explanation.
Hello :D
Great video.
I was wondering, when you calculate the length of the wall effected by your reaction and spread the load with theta equal to 45degrees, how do you handle the horizontal component to that load which appears, due to the inclination of the load path. To be able to due the spread of the load, don't you need to somehow take care of the tension in your calculation.
Great video daz, could you clarify how you got the 0 8 for the bearing factor. I understand the ratio between effective height and effective thickness, but I don't quite get the eccentricity part of the code (0.5t) thank you for your uploads
Do you mind doing a video on chimney breast removals at ground and first floor for example. Highlighting the calculations required to justify removal and the checks required on the wall left?
i did one recently actually, so can show it in a future video :)
@@EverydayDazz That would be great, looking forward to it 👍
Thanks great video! Red book - page 293 also contain Fk table using BS EN 1996-1-1:2005 can this table be used instead of table2 1:49 in video?
You need to be careful with using euro code fk and then using BS equations. If you use the euro code fk you should use the euro code equations and material factors.
Can you please do a wind calculation video
One day I will