1er Calculo sercha

DATOS Pendiente Calamina Nro cabios Luz entre serchas

0.8

23.19859 x 1.75 3 4

CALCULO DE LA SERCHA PRATT Analisis de carga Carga Muerta Calamina Peso Listones

6 Kg/m2 10 Kg/m3

Carga Viva Nieve Viento

60 Kg/m2 100 Km/h

Carga de viento

q= 48.8 Barlovento Sotavento

Cd= Cd=

Pbarl= Psota=

Kg/m2 -0.45 -0.6

-21.96 Kg/m2 -29.28 Kg/m2

succion succion

Calculo de los listones Sig Adm

85 q=

Luz listones Espaciamiento

76

Kg/m2 1.33 mts 0.725 mts

Q lineal

qc= 55.1

Kg/mt

Flexión Mt= ' adm

  



z=

9.80 Kg*mt 46.24 Kg/cm2 21.18 A=

27.52

Listones

2 1.63

3 2.63

I=

101.95

A= I=

95.26 1620.51

Calculo de cabios Pes. Cabios q= qc= Luz apoyo de Cabios

5 Kg/mt 76 Kg/m2 106.33 Kg/mt 2.5

Flexión Mt= z= Cabios

66.46 78.19

Kg*mt Kg/cm3

3 2.63

6 5.63

Corte R=  T=

132.92 2.09

Kg

0.27 0.71

cm cm

<

8 Kg/cm2

<

25 Kg/cm2

Flecha f= fadm= Aplastamiento

cabio y liston  T=

9.66

Calculo de correas P= 398.75 Luz correas 0

Kg 4 mts 46.24 Kg/cm2

Flexión Mt= z= Correas

398.75 862.37 6 5.63

Kg*mt Kg/cm3 10 9.50

A= I=

344.757 16728.1

Corte R=  T=

199.38 0.87

Kg

0.32 1.14

cm cm

<

8 Kg/cm2

<

25 Kg/cm2

Flecha f= fadm= Aplastamiento  T=

21.26

Cubicaje Luz Viga= Ancho Viga= Nro de cabios=

14 20

NOTA SI DIM > 6" camiar formula por -0.5

cm2

cm4

cm2 cm4

cm2 cm4

DATOS Pendiente Calamina Nro cabios Luz entre serchas

0.8

23.19859 x 1.75 3 4

CALCULO DE LA SERCHA PRATT Analisis de carga Carga Muerta Calamina Peso Listone

6 10

Kg/m2 Kg/m3

60 100

Kg/m2 Km/h

Carga Viva Nieve Viento Carga de viento

q= 48.8 Barlovento Sotavento Pbarl= Psota=

Cd= Cd=

Kg/m2

-0.45 -0.6

-21.96 Kg/m2 -29.28 Kg/m2

succion succion

Calculo de los listones Sig Adm q= Luz listones Espaciamento Q lineal

85 76 Kg/m2 1.33 mts 0.725 mts qc= 55.1

Kg/mt

Flexión Mt= Sig Adm''= z=

9.80 Kg*mt 46.24 Kg/cm2 21.18 A=

27.52

Listones

2 1.63

3 2.63

I=

101.95

A= I=

38.00 268.49

Calculo de cabios Pes. Cabios q= qc= Luz apoyo de Cabios

5 Kg/mt 76 Kg/m2 106.33 Kg/mt 1.5

Flexión Mt= z= Cabios

23.93 Kg*mt 28.15 Kg/cm3 2 1.63

4 3.63

Corte R=  T=

79.75 Kg 3.15

f= fadm=

0.21 cm 0.43 cm

<

8 Kg/cm2

Flecha

Aplastamiento

cabio y liston  T=

9.36

<

5 Kg/cm2

Calculo de correas P= 239.25

Kg 4 mts 46.24 Kg/cm2

Luz correas Sig Adm''= Flexión Mt= z= Correas

239.25 Kg*mt 517.42 Kg/cm3 6 5.63

8 7.50

A= I=

272.177 8231.14

Corte R=  T=

119.63 Kg 0.66

f= fadm=

0.39 cm 1.14 cm

<

8 Kg/cm2

Flecha

Aplastamiento  T=

20.61

<

5 Kg/cm2

NOTA SI DIM > 6" camiar formula por -0.5

cm2

cm4

cm2 cm4

cm2 cm4

TABLA PARA EL DIMENSIONADO DE PIEZAS DE

Pulgadas Pulgadas

cm2

cm4

cm3

cm4

2

2

2x2

1 5/8 x 1 5/8

17.04

24.19

11.72

2

3

x3

x 2 5/8

27.52

101.95

30.58

2

4

2x4

1 5/8 x 3 5/8

37.99

265.30

58.30

54.08

2

6

x6

x 5 5/8

58.95

1002.50

140.00

83.62

2

8

x8

x 7 1/2

78.63

2375.60

280.00

140.20

2

10

x 10

x 9 1/2

99.59

4829.80

400.00

141.40

2

12

x 12

x 11 1/2

120.55

8567.50

587.00

171.00

2

14

x 14

x 13 1/2

141.51

13860.30

809.00

200.90

2

16

x 16

x 15 1/2

162.47

20977.60

1060.00

230.40

2

18

x 18

x 17 1/2

185.43

30191.20

1359.00

260.00

3

4

3x4

2 5/8 x 3 5/8

61.40

433.50

94.10

227.10

3

6

x6

x 5 5/8

95.26

1620.00

226.70

352.80

3

8

x8

x 7 1/2

127.00

3840.00

403.10

470.00

3

10

x 10

x 9 1/2

160.86

7802.00

646.70

598.70

3

12

x 12

x 11 1/2

194.72

3840.00

947.70

720.90

3

14

x 14

x 13 1/2

228.58

22390.00

1306.00

846.60

3

16

x 16

x 15 1/2

262.45

33888.00

1722.00

971.80

3

18

x 18

x 17 1/2

296.31

48770.00

2195.00

1097.00

4

4

4x4

3 5/8 x 3 5/8

84.75

598.60

130.00

598.60

4

6

x6

x 5 5/8

131.51

2236.00

513.00

928.90

4

8

x8

x 7 1/2

175.37

5302.00

553.00

1238.00

4

10

x 10

x 9 1/2

222.13

10775.00

893.20

1569.00

4

12

x 12

x 11 1/2

268.90

19112.00

1309.00

1899.00

4

14

x 14

x 13 1/2

315.66

30919.00

1804.00

2229.00

4

16

x 16

x 15 1/2

362.42

46797.00

2378.00

2560.00

4

18

x 18

x 17 1/2

409.18

67350.00

3031.00

2890.00

6

6

6x6

5 1/2 x 5 1/2

195.11

3172.40

454.20

3172.40

6

8

x8

x 7 1/2

226.06

8044.40

844.00

4326.00

6

10

x 10

x 9 1/2

337.01

16347.00

1355.00

5479.00

6

12

x 12

x 11 1/2

407.96

28998.00

1986.00

6635.00

6

14

x 14

x 13 1/2

478.91

46911.00

2736.00

7786.00

6

16

x 16

x 15 1/2

549.86

71002.00

3607.00

8940.00

6

18

x 18

x 17 1/2

620.81

102185.00

4598.00

10090.00

8

8

7 1/2 x 7 1/2

362.81

10969.00

1152.00

10969.00

8

10

x 10

x 9 1/2

459.56

22292.00

1848.00

13894.00

8

12

x 12

x 11 1/2

556.31

39543.00

2708.00

16819.00

8

14

x 14

x 13 1/2

653.06

63970.00

3732.00

19744.00

8

16

x 16

x 15 1/2

749.81

96821.00

4919.00

22669.00

8

18

x 18

x 17 1/2

846.56

139344.00

6270.00

25594.00

10

10

10 x 10

9 1/2 x 9 1/2

582.11

28236.00

2341.00

28236.00

10

12

x 12

x 11 1/2

704.66

50088.00

3430.00

34181.00

10

14

x 14

x 13 1/2

827.21

81029.00

4727.00

40125.00

10

16

x 16

x 15 1/2

949.76

122640.00

6231.00

46070.00

10

18

x 18

x 17 1/2

1072.31

176502.00

7943.00

52014.00

12

12

12 x 12

11 1/2 x 11 1/2

853.01

60632.00

4152.00

60632.00

8x8

12

14

x 14

x 13 1/2

1001.36

98097.00

5722.00

71177.00

12

16

x 16

x 15 1/2

1149.71

148548.00

7543.00

81722.00

12

18

x 18

x 17 1/2

1298.00

213661.00

9615.00

92266.00

14

14

14 x 14

13 1/2 x 13 1/2

1175.51

115146.00

6717.00

115146.00

14

16

x 16

x 15 1/2

1349.66

174277.00

8854.00

132200.00

14

18

x 18

x 17 1/2

1523.81

250819.00

11287.00

149260.00

14

20

x 20

x 19 1/2

1697.96

347016.00

14014.00

166320.00

y S  x

bh 

2

6

x

Peso específico g = y

MADERA

Ixx MOMENTO DE INERCIA cm3

kg/m 1.625

1.625

24.1861689

1.625

2.625

101.951803

26.21

2.24

2.187

1.625

3.625

268.491795

40.62

3.78

3.281

1.625

5.625

1003.17007

54.05

5.04

4.374

1.625

7.5

2377.88461

58.47

6.58

5.468

1.625

9.5

4832.56608

82.88

7.72

6.562

1.625

11.5

8572.36209

97.30

9.06

7.645

1.625

13.5

13867.823

111.70

10.04

8.760

1.625

15.5

20989.4994

126.10

11.76

9.845

1.625

17.5

30207.9415

68.14

3.93

3.281

2.625

3.625

433.717515

105.80

6.10

4.921

2.625

5.625

1620.5055

141.00

8.14

6.562

2.625

7.5

3841.19821

178.70

10.31

8.202

2.625

9.5

7806.45291

216.40

12.48

9.843

2.625

11.5

13847.6618

253.90

14.64

11.483

2.625

13.5

22401.868

291.60

16.81

13.124

2.625

15.5

33906.1144

328.20

19.05

14.763

2.625

17.5

48797.444

130.00

5.43

4.374

3.625

3.625

598.943235

201.80

8.42

6.562

3.625

5.625

2237.84092

269.10

11.23

8.749

3.625

7.5

5304.51182

340.90

14.24

10.936

3.625

9.5

10780.3397

412.60

17.23

13.124

3.625

11.5

19122.9616

484.40

20.24

15.311

3.625

13.5

30935.9129

556.10

23.40

17.498

3.625

15.5

46822.7294

627.80

26.19

19.686

3.625

17.5

67386.9465

454.20

12.50

9.843

5.5

5.5

3173.98141

619.30

16.96

13.124

5.5

7.5

8048.22483

784.60

21.58

16.404

5.5

9.5

16356.3775

949.70

26.04

19.685

5.5

11.5

29014.1486

1114.80

30.65

22.967

5.5

13.5

46937.2472

1280.10

35.12

26.248

5.5

15.5

71041.3825

1445.00

39.73

29.529

5.5

17.5

102242.264

1152.00

23.21

17.498

7.5

7.5

10974.852

1458.80

29.46

21.873

7.5

9.5

22304.1512

1765.90

35.56

26.247

7.5

11.5

39564.7481

2073.10

41.66

30.645

7.5

13.5

64005.3371

2380.20

47.62

35.041

7.5

15.5

96874.6125

2687.30

54.16

39.372

7.5

17.5

139421.269

2310.70

37.20

27.341

9.5

9.5

28251.9248

2833.40

45.09

32.809

9.5

11.5

50115.3476

3326.10

52.97

38.322

9.5

13.5

81073.427

3819.00

60.86

43.801

9.5

15.5

122707.843

4311.70

68.60

49.215

9.5

17.5

176600.273

4152.00

54.61

39.371

11.5

11.5

60665.9471

 I 

bh 

4874.00

64.13

45.934

11.5

13.5

98141.5169

5596.20

73.66

52.496

11.5

15.5

148541.073

6318.30

83.18

59.058

11.5

17.5

213779.278

5716.00

75.29

53.644

13.5

13.5

115209.607

7711.00

86.45

61.289

13.5

15.5

174374.303

8707.00

97.61

68.901

13.5

17.5

250958.283

9702.00

108.00

76.556

13.5

19.5

347209.199

3

12

640 kg / m

3