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  • Users: mats12
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  1. mats12

    Reinforcing existing timber beam

    Hello, The existing timber roof beam in 18/20 cm - the span is 6 m. The existing beam will be reinforced with additional timber beam beneath and steel channels as shown in the attached image. Question: can reinforcing elements start/end at the face of the support (drawing A) or it should...
  2. mats12

    shear force between CLT wall panels - joints?

    Hello, how would you calculate shear force between panels? Is it OK to use horizontal force (seismic force or wind) on top of the wall (shear force of the single wall) and make a truss and tie model - the compression force in vertical element (joint between panels) is equal as shear force...
  3. mats12

    timber roof - buckling of main glulam beams

    Timber roof - main frames (arranged at 6,5 m) - glulam beams b/h = 200/1000 mm supported on RC walls. On top of glulam beams are timber beams b/h = 100/240 mm arranged at 1m. Can this beams be considered/act as lateral supports for glulam beam buckling verification? Thank you for help.
  4. mats12

    beam to column - steel connection

    Greetings, Bolted connections: It's clear that connection 2 is a moment connection. I'm wondering if connection 1 can be also considered as a moment connection since both bolts are bellow beam flanges?
  5. mats12

    Steel channel at the edge of RC slab

    Greetings! I am dealing with a steel channel that is placed at the edge of concrete slab. Since there is a 160 mm thick slab bellow a channel Im wondering how to design/calculate this for shear forces? I was thinking to use the short corbel model (strut and tie model), but Im not sure. I dont...
  6. mats12

    Connecting new RC foundation slab to the existing strip foundations

    Hello Exisitng residental building has strip foundation. New part of building will have foundation slab. I'm wondering what is the best way to connect both foundations? New structure will be connected to existing on all levels: founations, slabs, roof... thank you for your reply
  7. mats12

    RC stairs with or without column?

    Hello, I'd like to ask about concrete stairs. Is it possible to make it work without a column as shown bellow? All walls are masonry walls so no cantilever action there.
  8. mats12

    timber beam + steel plate - shear capacity?

    Existing timber beam doesnt have sufficient shear capacity. What is the best way to reinforce this? I was thinking about steel plate + epoxy glue. As far as I understand shear force will be divided based on stiffness of both elements (timber/steel). Connection between steel plate and timber...
  9. mats12

    is this possible - cantilever RC slab

    Hello Residental building, the interior RC slab in not at the same level as the cantilever slab. The cantilever part is non walking surface - only self and permanent load + snow load + wind load. Can this be reinforced properly so it could work even tho slabs are not at the same level? Dont...
  10. mats12

    Adding new support (beam) under existing RC slab?

    Greeting, I'm dealing with an existing residental building with masonry walls and RC slabs. I figured there is a bearing wall in the middle of the slab span - load from this wall acting on a slab is pretty large. Slab is only 140 mm thick and is not sufficient for current standards. What can...
  11. mats12

    new concrete slab on top of existing arch ceiling

    I am designing a new concrete slab on top of existing arch ceiling - steel beams are 1,50 m apart, masonry arches between. Spans are not that large but what I am strugling with is how to achieve that the new slab wont transfer any load to existing ceiling? Before concrete pouring I was thinking...
  12. mats12

    Concrete staircase questions

    HI! I would like to design this staircase, but have some issues/question about modeling: Is it okay to support RC landing on RC beam/corbel that is anchored to the concrete wall as shown or is there a better way to design this? Also can I use bottom (1st) stringer to support landing? Everything...
  13. mats12

    Shear reinforcement of RC beam

    Hi, I have a question about shear reinforcement of RC beam. I found a project where shear reinforcement of beam consists of 2 U shaped bars. I wonder is this even OK since this bars should be in tension but they are short - I know they overlap but still? Is this kind of detail more like...
  14. mats12

    RC balcony on different level than the rest of the slab

    What is the best reinf.detail so you get a good moment transfer from balcony to the inner RC slab? Is what I draw any good? I'd like to see some opinions and suggestion. Thx.
  15. mats12

    concrete beams supported by steel column?

    Hi, What is the best way to make this connection? Should there be a steel plate integrated in concrete beam so you can later weld steel column to it? Or is it better to weld steel plate on column first and then anchor the whole thing to concrete beam (before starting the second floor)? I...
  16. mats12

    Insufficient concrete cover

    I am dealing with an existing RC slab that is 200 mm thick and is reinforced sufficiently. But concrete cover at the bottom is only 10 mm. Slab is inside residental buidling so it is not exposed to the weather. What to expect when concrete cover is that thin? What is a smart thing to do here?
  17. mats12

    thin existing concrete slab - adding new support?

    Well hello! I have existing concrete slab - it is only 140 mm thick. Reinforcement is sufficient for self weight only - No top reinforcement, bottom reinforcemenet just sufficient, I'd like to add screed and other layers on top - so permanent and imposed load will be increased. Since existing...
  18. mats12

    Steel column - pinned supports

    Greetings, I have a question about pinned/fixed supports. Let's say we have two moment frames and I modeled column's supports as pinned. Because of that I have designed a footing to axial forces only. Now contractor made them fixed (based on detail bellow). As I know this means that footings...
  19. mats12

    question about reinforcement

    Greetings, Not my field so I have to ask... I have RC wall 250 mm in thickness (basement) and above it is RC slab and a RC column 300 x 300 mm in upper floor. Ancors (rebars) for column are installed in RC wall. Since wall is 250 mm thick and column is 300 mm (concrete cover is the same for...
  20. mats12

    designing as single concrete beam or as a frame?

    Not my field so Im gonna ask perhaps a silly question. Lets say we have a residental building with 2 storeys and 2 RC slabs. Would you design this as a single beam - case (a) in attached file or to consider the same beam as a part of RC frame - case (b) or (c) Im asking this because internal...

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