Bearing Design for Steel Beam - Padstones
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- Опубліковано 13 лип 2024
- In this video I will explain what a padstone is and then demonstrate a design example.
#structuralengineering #padstonedesign
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Literally doing this in work at the minute as a graduate and it's great to see an example with Euro codes. Great video 👍
Thank you for the video, it gives me peace of mind when building my roof!
Thanks for this video. It was very helpful.
Hey thanks for such tutorials. Love from India 🇮🇳
I think a mention regarding the vertical load resistance of the wall is worthy. Whilst the padstone is shown to spread the load on to the masonry safely, a further check of the VLR should follow.
Really clear and helpful, thank you
Thanks a lot, most comprehensive clear illustration of critical ideas about design of Steel beams, padstones and other structural members, one must subscribe this channel for better understanding of structure and design
merci mon ami!!
Another useful video. Thanks for taking the time to make it. You mentioned preference for a precast padstone, would this also apply to padstones used for a goal post arrangement when removing an internal load bearing wall? All the best
Hi, really enjoy your videos. They are really easy to follow and really practicable. Any chance you could do the beam in wall plane? I assume it would be a case of dividing the beam load by the bearing length and then carrying out the masonry checks as shown? Keep up the amazing work!
yes this seems to be highly requested! i will sort this video out soon :)
Great videos.
AWhat sort of beating stresses do you design for in existing buildings when the block or brick and mortar strength is unknown?
I tend to use a weak mortar/masonry strength initially to be conservative but then try and get some testing done later to verify mortar and masonry strength for final design.
It’s always good to do some research on the year of the existing building and gather some intel on traditionally what strength of masonry they used to use in that area/year.
Hi Dazz, thanks for the videos. Your videos are precise and very useful. I just have one question, if the width of the block is more than the dispersed width then shouldn't we use only the dispersed with instead of entire width?
Yes you would consider the dispersed width. If you need to spread the stress further, you would need to use a reinforced lintel instead of a normal pad stone (which has no reinforcement)
You're not thinking about sending me an ipad pro to test out?😂 So desperate to try it as I'm currently doing many hand calc for some work on HS2.
I'll just stick to watching these and maybe oooooneday 😂
Hi! which program are you using to draw? It looks very cool and your drawings are very legible.
Hi, I’m using the concepts app on the iPad.
Hi Dazz,
Great video, do you have an update on the beam spanning parallel with the wall and padstone design?
Keep up the great work!
Ed
Thanks! Soon! I’ve been so busy but will definitely get it done
@@EverydayDazz same. Lots of folks wanting extensions, found the mini-project super useful in that regards.
Much appreciated, the difficult I am having is calculating the stress under the beam for the parallel beam. As you show in the video the stress distribution is different and with the maximum bearing stress at the opening. I've read / seen engineers say assume a triangular stress distribution but unsure how to calculate the max bearing stress and how the bearing length reduces the stress. Really hope you can cover it.
I was actually having a look last night. The triangular stress distribution is the easiest but most conservative. For quick hand calcs this would be the option I’d go for. I am planning the video now and i will probably show case this method and another method (longer more accurate).
thank you for your explain to us Pad stone , but I need the second type(Beam on cavity wall) please when you will do it.
@@geezerdownunder I just mean beam forming an opening
I’ve done a video on it now :)
@@EverydayDazz Thank you
Love your videos.
I was accepted for a master’s program in structure, do you recommend me to buy the I pad pro?. Because I believe it will be very helpful to write and organize my materials.
Thanks for the comment.
I really recommend an iPad Pro or even a normal iPad. Something I wish I had when I was studying
Let me know how it goes. Looking to get one for the working working world but my wallet needs some next level justifications .. which maybe means I should just go with the air:/
love the sketching and use of iPad! makes me want one myself!
How do you justify the beam reaction initially spreading over the full width of the beams flange? Wouldn't the shear be carried within the web of the beam, at the support it would spread at a 45degree dispersion from base of web through the flange... with a 15 thk flange and web (for simplicity) you'd get a 15+2*15 = 45mm initial bearing width from steel beam onto masonry/concrete. I'm not sure you can just assume this spreads the full width of the flange.
perhaps with relatively low loads and low strength bricks you'd be able to justify the load through bending in the flanges although that assumption would rely on a certain amount of deflection across the flange which in turn relies on locally crushing the brick/concrete... maybe there's an obvious answer and I'm over thinking it...
The assumption would be that the bottom flange is stiff enough to spread the load to the ends.
Do you know which book or document Figure 6 is from at 1:09 ?
I have a quick question and would appreciate your answer. Basically, the steel beam rests on the wall. Its ends are not fixed and it makes it unstable when force is applied laterally. So what prevents the beam from sliding from its place if the load applied laterally?
I suspect it depends on the size of the lateral load. Personally I would never assume the wall would be able to resist a concentrated lateral load in the situation you describe. If the load is significant you should be looking to connect the end of the beam into a steel column section with a suitable connection. This way you can make sure that the lateral load is transferred successfully into the ground.
Exactly this
@@robertlygo4762 Thanks a lot!
Wall joints, steel or rc columns can be used to resist lateral loads as a pin support for handy calcs. On video’s example, the wall represents a roller support.
How much difference is the "in plane" bearing calc checks Daz?
It’s fairly different and there are some quite key differences in how you want to place your beam on the pad stone and wall, depending on the size of the load. The load is very concentrated on the tip or edge of the pad stone/wall and therefore the stress is very high causing it to over stress the wall. So depending on the magnitude of the load, you’ll need to position the beam further in plane or into the wall to reduce the high peak stress at the opening.
Hopefully that’s clear but I will do another video eventually about to explain. Just been stupid busy recently 🙁
Which code you using???
Can you use concrete lintels and cut them down to suit
Yeah. I spec these quite a lot when I need a bigger pad stone
Hi, do you have a link for the second option?
Will be doing it soon. Stay tuned
@@EverydayDazz I'll have to do it in BS5628 for now! I can see in EC6 6.1.3 a perpendicular option but not a parallel option. Maybe it can be modified, we shall see. I've subscribed in anticipation!
Tbh the BS code for masonry is so much better and my video will cover the BS version as I try and stay away from the masonry euro code. They make it so horribly complicated it’s just awful.