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  1. gmd255

    strip footings under small object?

    I am dealing with a small object (something like a shed). Walls are masonry and on top is RC slab 140 mm thick. Object dimensions are: 5,50 m x 1,90 m (top view) and approx. 2,50 high. Footings wont be heavily loaded but Im wondering about soil settlements if I choose option #1. Id like to...
  2. gmd255

    stiffness of RC beam - internal forces

    Hello. I d like to hear some explanation why stiffness of a beam has such influence on internal forces (shar, bending moments) of the beam. In my case I have 200 mm RC slab with a design load of 20 kN/m2. In case #1 the stiffness of a beam is equal: EI (where E is modulus of elasticity for...
  3. gmd255

    Local thickening of a slab on grade

    Hello, I havent done this before so Im asking for some guidance and suggestions. When Im dealing with slabs on grade I choose thickness (ussually 250 mm thick for residental structures) and this is sufficient most of the time. But in this case Im dealing with large single loads (from columns)...
  4. gmd255

    Column supported on a slab - punching shear

    im from Europe so I use Eurocodes (I believe ACI has similar control). Lets say we have a column on a slab that is supported by walls (green lines in pictures). Eurocodes give us 3 options for control perimeter (punching shear): 1. column is in the middle of a slab, 2. column is on / close to...
  5. gmd255

    steel beam flange - Von Misses control?

    Hi guys. I have a steel beam that is loaded with distributed load + concentrated - point loads at the bottom flange. So in bottom flange there will be stresses from bending of the beam because of distributed load (qd) + thre will be stress perpendicular to that because of point load acting on...
  6. gmd255

    how to do a control of steel beam flange under a load?

    I have to control a bottom flange of a steel beam. Flange is loaded by timber beams that are carrying some insulation and some ceiling plates) - load of this is around 30 kg/m2 (0,30 kN/m2). I have seen a similar thread on this site once upon a time and there were some talking about yielding...
  7. gmd255

    anchoring rebars in foundations

    Im more of a steel/wood guy, so I hope i ll get some feedback about this topic. What is the proper way to anchor rebars in foundation? Im from EU so Im using Eurocodes. In a case of large single foundation we can get bend (L shape - 90 degrees) rebars since there is enough space in foundation...
  8. gmd255

    steel connection (beam to beam and beam to column)

    Greetings. Im designing connections of steel structure and I have some questions for more experienced guys on connections. Structure is anchored to an existing building. I have designed primary beam to column connection as pinned (connected with 4 bolts). I think thats pretty simple and...
  9. gmd255

    reinforcement mesh or rebars?

    Hi, when do you guys reinforce slabs with reinforcement mesh and when with rebars only (no mesh)? I have seen that for large spans (lets say 6 x 6 m) they usually reinforce slabs with rebars, but not meshes. Why is that? Maybe because of large tension forces in rebars which means we need larger...
  10. gmd255

    wind on roof

    I have seen another thread where someone mentioned this. If we do sheating on timber rafters with wooden boards, does that achieve, that horizontal forces get transfered to bearing (shear) walls in a direction of a wind force, since wall perpendicular to its plane is not that stiff. Im asking...
  11. gmd255

    new opening in existing wall?

    Hello, I have a question. Lets say we have a bearing masonry or RC wall with a RC slab above. Now we want to make a new opening in this wall. Im wondering, what is a procedure in case that a beam above opening is a steel beam? How to install this beam and how to provide that there is no space...
  12. gmd255

    would you add bracing?

    Ive seen this yesterday and If this was mine Id replace columns (they look in a bad shape) and add some bracing between them (knee braces). I know that there is a sheating above rafters which connects roof together and provide some horizontal stability but in a case of lateral force this looks...
  13. gmd255

    different results (bending moments/shear) for different cross sections (FEM)

    Im using software Tower 6 for FEM. I have modeled 3 frames (same geometry but different cross sections/material for each frame): MODEL 1: concrete 300/300 mm MODEL 2: concrete 200/200 mm MODEL 3: steel H section Im wondering why do I get so different results for each model? Looks like...
  14. gmd255

    moment frame: column - beam (weld connection)

    I have little experiences with welding connections. I asking about connection between a column and a beam. I know that both options are possible, but I think option #1 (beam on top of column) is better in this case since welds are not loaded with vertical shear. If my calculations for welds go...
  15. gmd255

    adding a fence on high thin RC wall

    Im adding a glass fence on existing RC wall. Wall is thin (150 mm wide and 1580 mm high). Reinforcement in wall is fi8/20 cm. Since Im adding a fence on top, wall will be exposed to additional load from wind forces. So I have to check existing reinforcement (larger moments at the base of the...
  16. gmd255

    effect of new oppenings on existing wall + slab

    Making new oppenings in existing masonry. Above is RC wall/parapet and a slab. Do making new oppenings affect parapet (200/1500 mm) in any way? Because of new oppenings I think that horiz. forces (wind) on the parapet affects existing slab, but not a parapet. Parapet is a cantilever and bending...
  17. gmd255

    steel support anchored to existing RC parapet

    I have an existing RC parapet that is 150 mm thick. I would like to anchor a steel support to this parapet. Steel support (beam) is a bearing seat for a timber beams along a parapet. I have two options. Id like to hear from you what do you think/suggest. OPTION 1 I have steel C section +...
  18. gmd255

    Screed on timber boards

    I have to ask... Im planning to make a 40 mm thick screed on timber boards (boards are approximately 50 mm thick but without tongue and groove joints). There is no connections between screed and boards (no interface connectors). Since there is nothing connecting boards together (no tongue and...
  19. gmd255

    difference in shear reinforcement detail?

    I am connecting new and existing concrete elements. Its hard for new stirrups to have sufficient anchoring in existing concrete element so I designed the beam as noncomposite (new RC part is able to take over the whole shear force). For shear reinforcement (vertical stirrups)I was thinking about...
  20. gmd255

    rebars as anchors - connecting existing and new RC elements

    I dont have much experience with reconstructions so I hope my questions wont be silly. Id really like to know what do you guys usually do/suggest in situations like this. I have to connect a new RC slab (140 mm thick) to existing RC slab (same thickness). There will also be some new openings...

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