çelik kafes proje

7/28/2019 elik kafes proje

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GEOMETRY OF TRUSS SYSTEM

Slope of roof, a=8. 53 m=0.15

Sina=0.148 cosa=0.989 tana=0.15


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O1 3.29 V1 1 D1 3.57 U1 6.5

O2 3.29 V2 1.98 D2 3.57 U2 7

O3 3.54 V3 1.98 D3 4.3 U3 6.5

O4 3.54 V4 1 D4 4.3

O5 3.29 D5 3.57

O6 3.29 D6 3.57

DIMENSIONS OF MEMBERS(M)

ANALYS OF LOADS

SELF WEIGHTS:

Roof coating : 12kg/m2 ( horizontal plane)

Purlin self weight : 10kg/m2 ( horizontal plane)

Stability connections :

= 2kg/m2 ( horizontal plane)

Wight of hardware : 15kg/m2 ( horizontal plane)

Weight of truss : 24kg/m2 ( horizontal plane)

Snow load : 184kg/m2(horizontal plane)

Wind load : 80kg/m2 (roof plane)

SNOW LOAD:

Pk= m x Po for a


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WIND LOAD:

Pr=c x q c =1.2 x 0.4

c = -0.222

Pr=-0.222 x 80 = -17.76 kg/m2

P pull= 0.4 x*80 = 32.00 kg/m2


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PURLIN DESIGN

Purlins made of I profiles. Roof coating materials are made of corrugated steel sheets and maximum space is

3.5 m which carry 196 kg/m2. Bottom and top steel sheet thicknesses are 0.7mm. Its

eps thickness is 70mm.

Distance between the purlins are changing,you can see this distance from the upperdrawings.

Maximum distance will be used for the purlin design and it is 3.5m.

Distance between two truss system is 4m.

Total q= dead loads +snow loads (wind loads is not calculated because of pulling !!)

Totalq=(12 + 10 + 2 + 184)x3.54 = 736.32 kg/m

Simple beam have 8.53 degree so we have qx qy .

Also we have two purlin braches for y axis.

qx = 736.32 x = 728.17 kg/m

qy = 736.32 x = 109.22 kg/m

Mx=

=

= 145.6 tcm

My =

=

(

)

= 2.43 tcm


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For I 180 Ix =1450cm4 Iy =81.3 cm

4

Wx =161 cm3

Wy =19.8 cm3

STRESS CONTROL:

s=

+

=

+

=1.02< 1.44 kg/m2

DISPLACEMENT CONTROL:

f = 6.20 x

( q=t/m , l= m , I=cm4 ) fmax =

fx = (6.20 x 0.728 x 44

) / 1450 fx = 0.799 cm

fy = (6.20 x 0.11 x (4/3)4) / 81.3 fy = 0.027 cm

f = (0.7992 + 0.0272) = 0.8 cm

fmax = 400/300 =1.33cm

f< fmax it is done


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TIE BAR CONTROL:

Z =

qy

qy = 3 x109.22 =327.66kg/m

Cos= 0.936

Z =4/(3x0.936) x 327.66

Z=466.74 kg

Chosen tie bar = 8

Fz = ( (0.86 x 0.8)2)/4 Fz=0.372 cm2

466.74/0.372= 1254 677 kg/cm2 < 1440 kg/cm2

Tie bar is checked and it is usefull

RESULTS:

Purlins are I 180 and purlins are design by two tie bars. Tie bars are 8


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ANALYS OF TRUSS SYSTEM

SELF WEIGT LOADING

FULL SNOW LOADING

HALF SNOW LOADING


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RIGHT WIND LOADING

LEFT WIND LOADING


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SELF WEIGT LOADING

Mb=0 , (0.41 x 20)+(0.83 x 16.75)+(0.86 x 13.5)+(0.89 x 10)+(0.86 x 6.5)+(0.83 x 3.25)

= 20 x A A = 2.55 t

Fy= 0 B = 2.55 t

USING RITTER METHOD, we can seperate the system from the O1 frame and equation is

like that;

-(0.41 x 3.25) + (2.55 x 3.25) = 1.49 U1 U1 = 4.67 t

From the firs node those equations are calculated;

U1 = 0.91 x D1 , (0.416 x D1) + V1 = 2.55 t

V1 = -0.42 t, D1 = -5 13 t


10/13

First node

From the 2. Node O1 = 0 t

Calculation of 4. Node ( Ritter method)

(2.55 x 6.5)(0.41 x 6.5)( 0.83 x 3.25) +(1.95 x O2 ) = 0

O2 = - 5.75 t


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Calculation of 3. Node

D2 (horizontal) + 4.67 -5 67 = 0 D2 (horizontal) = 1 t

D2 (vertical) +0.83 +0.852.13 = 0 D2 (vertical) = 0.45 t

D2 = (12+ 0.452)(1/2) D2 = 1.1 t

From the geometry of truss system V2 = -0.86 t

U2 is calculated ritter metod, truss system seperated from O3 and moment values calculated to

the ridge point;

(2. 55 x 10)( 0.41 x 10)(0.83 x 6 75) - (80.86 x 3.5) ( U2 x2.5) = 0

U2 = 5.12 t

D3 is calculeted from the 5. Node and D3 = 0.69 t

Truss system is symmetric so the other ones are equal to those values.


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FRAME FORCES FOR THE OTHER LOAD PATTERN

LEFT WIND

Text Tonf

D1 1.7768

D2 -0.4733

D3 -0.0821

D4 -0.5104

D5 -0.3489

D6 2.207

O1 0.0175

O2 2.1214

O3 2.1577

O4 2.5101

O5 2.4446

O6 0.0315

U1 -1.5452

U2 -1.9087

U3 -2.0068

V1 0.1183

V2 0.2447

V3 0.4419

V4 0.2123

FULL SNOW

Text Tonf

D1 -14.9854

D2 3.2061

D3 2.0279

D4 2.0279

D5 3.2061

D6 -14.9854

O1 0

O2 -16.7263

O3 -16.7263

O4 -16.7263

O5 -16.7263

O6 0

U1 13.626

U2 14.8911

U3 13.626

V1 -1.211

V2 -2.513

V3 -2.513

V4 -1.211

DEAD LOADS

Text Tonf

D1 -5.1361

D2 1.0988

D3 0.6951

D4 0.6951

D5 1.0988

D6 -5.1361

O1 0

O2 -5.7327

O3 -5.7327

O4 -5.7327

O5 -5.7327

O6 0

U1 4.6702

U2 5.1037

U3 4.6702

V1 -0.4149

V2 -0.8613

V3 -0.8613

V4 -0.4149

HALF SNOW(RGHT)

Text Tonf

D1 -4.4729

D2 2.2648

D3 -1.6216

D4 3.6443

D5 0.9414

D6 0

O1 0

O2 -6.195

O3 -6.195

O4 -10.528

O5 -10.528

O6 0

U1 4.0671

U2 7.446

U3 9.5555

V1 0

V2 0

V3 -2.51

V4 -1.21


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