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  1. n3jc

    RC beam on steel column offset

    Greetings, Residental building - I have two RC beams (cross section 250x490 mm – partially embedded in the RC slab) that are supported on the steel column (D/t = 150/10 mm). The axial compression force in the column is large (400 kN). In my model I defined the steel column as pinned on both...
  2. n3jc

    Residental building - large shear forces in the RC slab

    Hello, I'm dealing with the small residental building with RC slab that is 260 mm thick. The slab can't be any thicker. The slab is heavily loaded on the cantilever part (overhangs in both directions) because the upper storey has different plan view (see 3d image of the structure), so it has...
  3. n3jc

    New CLT slab supported on existing RC columns

    Hi, I'm dealing with the existing residental building with the masonry and concrete walls 300 mm thick and the RC frames in the ground floor that support existing concrete slab. RC columns are 300x300 mm and are reaching 5 m above the RC slab - they are supporting existing roof beams at the...
  4. n3jc

    timber diagonals for wall bracing - tension/compression?

    Hello, I am looking at timber frame rsidental buildings and I have a question about designing of wall bracing - diagonals: are this diagonals designed to carry only in compression or both? comression + tension? In case of seismic forces we can get large compression/tension forces in diagonals...
  5. n3jc

    Concrete wall buckling?

    Hi! We are dealing with the existing RC walls (200 mm thick). Above the walls is the RC slab (200 mm thick)and existing timber roof (will be removed). The plan is to add a new light storey (timber CLT walls and slabs)on top of existing one (instead of existing timber roof). This means that...
  6. n3jc

    Reinforcing old existing timber ceiling with concrete slab (composite)

    Hello An old timber ceiling consists of timber beams (0,70 m apart) and plywood above them. I'd like to reinforce it by adding the concrete slab on top of it - to make a composite (see images bellow). This is a common practice in my country for reinforcing old existing buildings (it connects...
  7. n3jc

    Ultimate axial load and moment interaction diagrams for RC walls

    Hi, I'm searching for some tools to help me with designing of RC walls according to eurocode EC8. I need a tool to help me determine reinforcement based on the ultimate axial load and moment(interaction diagrams) for RC walls. Do you guys know for any free software or spreadsheet for this...
  8. n3jc

    Two retaining walls on the common footing

    Greetings, I have to design a RC retaining wall as shown in the attached image bellow. Wall 1 is high (4 m above the footing) and wall 2 is shorter (aprox. 2 m above the footing). I have 2 RC walls on common footing. I was wondering how the earth pressure acts on wall1/wall2? On wall 1 acts...
  9. n3jc

    foundation slab + edge beam - shear forces?

    Greetings, let's say the structure with RC columns on the foundation slab with the edge beam around the perimeter - I'm thinking about shear forces between edge beam and foundation slab in the area of columns. There is a spike of shear forces in this area because of the large forces in columns...
  10. n3jc

    foundation concrete slab - dilatation yes/no?

    Greetings Contractor wants me to make this foundation slab (residental building) in one piece since he is worried about differential settlements. He also wants outer (smaller) part of the foundation slab to be only 200 mm thick. I do not like any of the proposed solutions. If I make this in one...
  11. n3jc

    warehouse design question

    Greetings I'd like to hear some opinions on this structure (tire warehouse) that has: -timber roof (rafters supported on timber beams), - timber beams are supported on RC frames, - there is a RC slab above ground storey above entire structure – except the first field which is empty, - walls...
  12. n3jc

    load path?

    Residental building, corner beams in the ground floor. Slab 200 mm thick. WHat is the load path in your opinion: model M1 - acting more as simple span beam (600 x 200 mm) model M2 - acting as cantilever beams that supports slab I would say its closer to model M2 because its stiffer. But I get...
  13. n3jc

    Common strip footing

    Greetings, I would like to hear some thoughts about following situation: Structure (1) is a residental building (masonry walls with RC slabs), structure (2) is a canopy (RC frame + walls with RC slab on top). Structure (1) and (2) are not connected (dilatation is 50 mm) but since they are so...
  14. n3jc

    Common strip footing

    Greetings, I would like to hear some thoughts about following situation: Structure (1) is a residental building (masonry walls with RC slabs), structure (2) is a canopy (RC frame + walls with RC slab on top). Structure (1) and (2) are not connected (dilatation is 50 mm) but since they are so...
  15. n3jc

    reinforcement - concrete wall (with cremation niches)

    I have to draw reinforcement. I havent seen this one before. Any suggestion about reinforcment details since it depends on work sequance (formwork and casting of concrete in phases)in my opinion?
  16. n3jc

    connecting RC foundation slab and RC footing

    Greetings, I have to make connections since settlements under RC foundation slab and footings will be different and Id like to avoid cracking (I m dealing with a masonry house with RC ties and beams). Im wondering what do you suggest as the best way to connect footings (dimension 1 x 1 x 0,5 m)...
  17. n3jc

    wooden garage - bracing

    yellow - openings blue - timber posts, diagonals for bracing in a wall There is a plywood sheating on a roof, diagonals between posts and openings for bracing in X and Y directions. My question: For bracing in X direction I made 2 trusses (0,70 m wide) on each side of large opening. One of...
  18. n3jc

    Contraction joints - RC slab on ground

    Hi, Im designing contraction joints for RC slab on ground. I have never done this before but I have found and read quite a few articles about it. What Im asking is should I make square plates 8,75 x 7,40 m (between columns) or is that way too much? I have read they shouldnt be more than 36 d...
  19. n3jc

    What options to I have here? (residental building)

    Im dealing with a residental building with a ground storey + attic. All bearing walls are masonry 250 mm thick. RC slab above ground storey is 150 mm thick - but it wont be done across whole building area above ground storey! Above an attic there is another RC slab - roof slab that is 150 mm...
  20. n3jc

    RC cantilever slab

    Lets say we have a masonry walls with RC slab and a balcony. Since cantilever part of a slab is pretty long and loaded at the end, we get large bending moments above masonry wall (upper zone of a slab needs tension reinforcement). That usually means that we have to do one or both: - to heavily...

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