Fformiwla cyfrifo pwysau damcaniaethol ar gyfer deunyddiau metel fferrus
| Enw | Uned pwysau | Fformiwla cyfrifo | Enghraifft o gyfrifiad |
|
Dur crwn gwialen weiren |
kg/m |
W=0.006165*d² d=Diamedr(mm) |
Dur crwn 100mm o ddiamedr Pwysau fesul metr=0.006165*100²=61.65kg |
| Rebar | kg/m |
W=0.00617*d² d=Diamedr trawsdoriadol(mm) |
Dur wedi'i edafu â diamedr trawsdoriadol 12mm Pwysau fesul metr=0.00617*12²=0.89kg |
| Dur sgwâr | kg/m |
W=0.00785*d² d=Lled ochr(mm) |
20mm lled ochr dur sgwâr Pwysau fesul metr=0.00785*20²=3.14kg |
| Dur gwastad | kg/m |
W=0.00785*d*bd=Lled ochr(mm) b=Trwch(mm) |
Lled ochr 40mm, dur gwastad o drwch 5mm Pwysau fesul metr=0.00785*40*5=1.57kg |
| Dur ongl cyfartal | kg/m | W=0.00785*[d*(2b-d)+0.215(R²-2r²) ] d=Lled ochr b=Trwch R{0}}Radiws arc mewnol r=Diwedd y radiws arc |
Dur ongl hafalochrog 4mm * 20mm Pwysau fesul metr=0.00785*[4*(2*20-4)+0.215(3.5²-2*1.2²)]=1.15kg |
| Dur ongl anghyfartal | kg/m |
W=0.00785*[d*(B+b-d)+0.215(R²-2r²)] B=Lled ochr hir d=Lled ochr byr b=Trwch R{0}}Radiws arc mewnol r=Diwedd radiws arc |
Dur ongl anghyfartal 30mm * 20mm * 4mm Pwysau fesul metr=0.00785*[4*(30+20-4)+0.215(3.5²-2*1.2²)]=1.46kg |
| Sianel dur | kg/m |
W=0.00785*[hd+2t(bd)+0.349(R²-r²)] h=Uchder d=Trwch gwasg b=Hyd coes t=Trwch coes cyfartalog R{0}}Radiws arc mewnol r=Diwedd radiws arc |
Dur sianel 80mm * 43mm * 5mm Pwysau fesul metr=0.00785*[80*8+2*8(43-5)+0.349(8²-4²)]=8 .04kg |
| I-beam | kg/m |
W=0.00785*[hd+2t(bd)+0.8584(R²-r²)] h=Uchder d=Trwch gwasg b=Hyd coes t=Trwch coes cyfartalog R{0}}Radiws arc mewnol r=Diwedd radiws arc |
250mm * 118mm * 10mm I-beam Pwysau fesul metr=0.00785*[250*10+5*13(118-10)+0.8584(10²-5²)]=42 .2kg |
| Plât dur | kg/m² |
W=7.85*b b=Trwchus |
Plât dur 4mm o drwch Pwysau fesul metr=7.85*4=31.4kg |
| Pibell ddur | kg/m |
W=0.02466*S(D-S) D{0}}Diamedr allanol S=Trwch wal |
Pibell ddur di-dor gyda diamedr allanol 60mm a thrwch wal 4mm Pwysau fesul metr=0.02466*4*(60-4)=5.52kg |
