Download Residential Building Design Using Excel Program - Final PDF

TitleResidential Building Design Using Excel Program - Final
File Size538.2 KB
Total Pages28
Document Text Contents
Page 1

Material and its Properties:

Type of wood Mahogany

Bending and Tension, Fb = 13.8 MPa

Shear, Fv = 1.63 MPa

Compression, Fc = 9.10 MPa

Modulus of Elasticity, E = 6550 MPa

Specific Gravity = 6.28 kN/m
3

Fp = 9.1 MPa

Loadings:

Wind Pressure = 1.44 kPa

Minimum Roof Live Load = 0.764 kPa

GI roofing = 0.143 kPa

Spacings: Truss Data:

Purlins = 0.7 m Span = 8 m

theta, ѳ = 26.57 deg Height = 2 m

Truss = 2.5 m

Floor joist = 0.5 m

Dimension Trial for Purlins:

2 " x 6 " = 50 mm x 150 mm

I = 14062500 mm
4

Loadings:
Dead Load

Roofing = 0.1001 kN/m

Purlin weight = 0.0471 kN/m

Total DL = 0.1472 kN/m

Live Load = 0.5348 kN/m

WDL+LL = 0.682 kN/m

Wind Load = -0.7056 kN/m

LOAD COMBINATIONS:

Normal:

case1: Dead Load + Live Load: Wn =Pn( cos ѳ ) = 0.6100 kN/m

case2: Dead Load + Live Load + Wind Load: Pn( cos ѳ ) = -0.0211 kN/m

Tangential:

Dead Load + Live Load: Wt = Pt( sin ѳ) = 0.3050 kN/m

Wn = 0.6100 kN/m

Wt = 0.3050 kN/m

DESIGN OF PURLINS

Page 2

Moments:

Mx = Mn = 1/8 WnL
2
= 0.4766 kN-m

My = Mt = 1/8 WtL
2

= 0.2383 kN-m

Shear:

Vx = (1/2)WnL = 0.7625 kN

Vy = (1/2)WtL = 0.3812 kN

CHECK FOR BENDING:

To be safe, Fb > Fact

Fact = = 6.3542 Mpa < 13.8 Mpa

design is safe in bending!

CHECK FOR SHEAR:

To be safe, Fv > Fvact

Fvact = = 0.2287 Mpa < 1.63 Mpa

design is safe in shearing!

CHECK FOR DEFLECTION:

To be safe, Yall > Yact

Yact = (5/384)(WLn
4
/EI) = 3.3684 mm

Yallow = L/240 = 10.4167 mm

design is safe!

Therefore,

Use 2 " x 6 "

Wooden purlins @ 0.7 m spacing o.c

hb

My

bh

Mx
22

66


bh

Vy

bh

Vx

2

3

2

3


Page 15

DATA:

Specific Gravity = 6.28 kN/m
3

Modulus of Elasticity = 6550.00 MPa

Length of Girder = 4 MPa

Joist Spacing = 0.50 m

Residential Live Load = 2.00 kPa

Weight of the girder = 0.11775

Dimension Trial:

3 " x 10 " = 75 mm x 250 mm

I = 97656250 mm
4

2.31

joist

girder

4 m

Total load carried by the girder

concentrated load from floor joist = 2.31 kN

Weight of the girder = 0.11775 kN/m

Analysis using GRASP software:

Bending Moment

DESIGN OF GIRDER

Page 27

Analytical Model:

1.4

m

Theta = 33.69

2.1 m

w= 0.24 Kn/m

L= 2.52 m

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