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  • Users: nivoo_boss
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  1. nivoo_boss

    Wild differences in manual and FEM calculation results (floor on grade)

    Hello everyone! So I'm messing around with a concrete floor. I have a point load of 60 kN acting on an area of 0,04 m². I calculated the Winkler coefficient as 9,2 MN/m³. The floor slab is 200 mm thick, C35/45 concrete. I have a handbook for concrete floors (it's in Estonian, so no point in...
  2. nivoo_boss

    Expansion joints for a 141x182 m one-storey building

    Hey everyone! There's a possibility I have to design a large manufacturing building with external dimensions of approximately 141x182 m. It'll probably have RC or steel columns, steel trusses for roofs and metal deck on top of these trusses. The building also houses a lot of cranes, a few of...
  3. nivoo_boss

    Silo design. Eurocode 1991-4 interpretation

    Hello everyone! So I'm designing a steel grain silo with a capacity of around 33 m³ for the vertical part (class 1 according to EC 1991-4, under 100 t) - the cross-section is 2,0x2,6 m and the vertical section is 6,75 m high (so the grain would weigh around 300 kN at a unit weight of 9 kN/m³) ...
  4. nivoo_boss

    Understand a dynamic load representation

    Hey everyone! So I'm designing a factory that has a vibrating equipment on one floor. The load is given like this: Do you have any thoughts what that "6 pol" might mean? I'm not too familiar with dynamic analysis but am trying to educate myself a little in Robot Structural Analysis.
  5. nivoo_boss

    Steel connection design advice, sway frame

    Hi everyone! Perhaps you have some helpful suggestions. I'm designing a facility that has some wheat silos on top of sway frames. The frames itself are about 7 m tall and span 5 m, but the loads from the silos are really large. In my calculation model all the joints are currently hinged. Below...
  6. nivoo_boss

    Buckling lengths for columns next to a lower non-sway frame

    Hey everyone! What the buckling lengths for member B6 and the top half of B7 should be? All supports are pinned and currently connections between the beam B8 and its columns are pinned as well. B6 is about 13 m high.
  7. nivoo_boss

    Hollow core slab roof inclined

    Hey everyone! So the contractor wants I design a roof with a two-sided 6° inclination using hollow core slabs - he thinks he'll have easier time with the insulation this way. Below is a preliminary section of the building. The yellow ones are hollow core slabs that span ~7 m and they are...
  8. nivoo_boss

    Tying strip's rebar with columns' pads

    Hey everyone! So I have a situation where I have a rather large but simple building with RC columns and steel trusses. The building is unheated, it's like a riding ground for horses and there is an area inside next to the exterior wall with masonry walls. The walls run near the columns. The...
  9. nivoo_boss

    Tension in glulam beam perpendicular to grain

    Hey everyone! Is there some way to estimate the capacity of the joint seen on the drawing below? A force is applied to the notch, which puts the area near the cut in tension perpendicular to grain.
  10. nivoo_boss

    30 m high cantilever billboard column in low seismic zone

    Hey everyone! I have a chance to quote for a design of a 30 m high steel billboard column. It's located in Denmark, and the reference PGA in this particular area is agR=0,1 m/s². The design wouldn't be nothing too complex if it wasn't for the seismic part, which I've never done before. That's...
  11. nivoo_boss

    Any way to design a 9 m (30 ft) high cantilever masonry fire wall?

    Hey everyone! So I have to solve a problem with a firewall between two buildings. I cannot tie it to the buildings on both sides so it has to be free-standing. I'm thinking about 240 mm CMU filled and reinforced blocks but even just with these the slenderness is about 2,8 times over the allowed...
  12. nivoo_boss

    Bottom chord buckling of a steel truss due to compression from wind uplift

    Hey everyone! This is sort of a different thread, since I'm not asking advice on any particular problem but would just like to hear some general opinions. It's about steel roof trusses that develop compression in the bottom chord due to uplift from wind. The out-of-plane buckling length is...
  13. nivoo_boss

    Timber beam overlap splice

    Hey everyone! Perhaps you can help. I have this timber beam that has to be spliced since 7 m long elements are not available. I want to make a 1,3 m overlap, that has 2 bolts at each end of the splice so the bolt groups are spaced 1 m apart. Is this thing viable? I need to design the bolted...
  14. nivoo_boss

    Help translating some specialized vocabulary to English

    Hello everyone! I'm an Estonian and my company was asked to put together a quotation for a project in English. We do building design. I'm having some trouble translating some specialized vocabulary to English, so perhaps you can help. 1) How do you call like a topographic/geodetic survey of a...
  15. nivoo_boss

    How to analyze a hollow core slab diaphragm?

    Hey everyone! So I have this rather long (~100 m) two-storey building. It's supported by RC columns. The second floor is made up of RC beams and hollow core slabs. The roof has steel trusses. The columns are spaced 6 m and 12 m. It has a masonry wall running in the middle across the building...
  16. nivoo_boss

    Main bar bundles in an RC beam

    Hey everyone! Perhaps you can give some advice. I have a heavily loaded RC beam with a 5,6 m span with a design moment of around 1000 kNm. I calculated I need to use 8 D25 B500B main bars in the bottom. I want to place them in the mid-section of the cross-section because I use Peikko's PC beam...
  17. nivoo_boss

    Expansion joint in a 100 m long RC building

    Hey everyone! So I have to design this two-storey storage building. The second floor is made of precast RC beams and support ~12 m 400 mm hollow core slabs. The roof is supported by ~12 m steel trusses. The building is about 10 m high. Anyway, my question - is an expansion joint needed in a...
  18. nivoo_boss

    Steel stand for a large log grapple maintenance

    Hey everyone! So I have to design a steel platform that's going to be used for supporting large log grapples for maintentance. The grapple weighs 150 kN or around 15 t. I'm thinking about applyling four point loads to the structure which arise from the grapple legs. But my main question is how...
  19. nivoo_boss

    Short-span glulam moment frame design - is it a good idea here?

    Hey everyone! So I need to design a house and the client wants the interior to be spacious. The problem is, I'm not too familiar with timber design and I can't really decide if the frame I drew is even feasible with timber. So I came here to get some advice. My main problem is in-plane...
  20. nivoo_boss

    Strengthening a Soviet era 12 m RC beam

    Hey everyone! I have a situation where a Soviet era RC beam (it's sort of like a truss, where the chords are wider than the middle part of the beam) has its bottom chord cut with most of the rebar and cables cut - seems it was done a while ago to fit a goddamn door, thank god it has stood this...

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