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Truss Design
Truss DesignFull description...
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Aboalmaail Alamin
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warren truss, baltimore truss, petit truss
1
Design of Truss Members
s e r u t c u r t S h t
5 _ g e e f w a T i z a y N
2
Design of Truss
Practice of structural steel design
Design Load (Load combination)
Member Name
Top Chord
Bottom Chord
Strut
Tie
Notation
Load Combinations:
Axial Force
Force
due to Combination
Length
Dead Load
Life Load
Wind Load
-195.96
-245.65
172.42
-667.38
-323.03
45.43
2.975
-184.08
-230.76
162.81
-626.93
-302.44
43.85
2.975
-160.33
-200.99
142.33
-546.05
-262.79
38.93
2.975
-160.33
-200.99
143.60
-546.05
-261.26
40.71
2.975
-137.09
-171.86
123.59
-466.90
-222.43
35.94
2.975
-110.24
-138.20
100.28
-375.46
-177.79
30.15
2.975
192.12
240.83
-168.42
654.30
317.44
-43.67
4.375
174.65
218.94
-152.43
594.81
289.39
-38.75
4.375
144.66
181.34
-124.97
492.67
241.24
-30.30
4.375
126.21
158.21
-108.08
429.83
211.61
-25.10
4.375
-12.55
-15.73
11.49
-42.74
-20.15
3.54
1.752
-18.82
-23.59
17.23
-64.09
-30.22
5.30
3.143
-7.02
-8.80
6.43
-23.91
-11.27
1.98
1.759
-19.41
-24.33
17.77
-66.10
-31.16
5.47
2.761
-25.69
-32.21
23.52
-87.50
-41.26
7.24
4.135
7.47
9.36
-6.84
25.43
11.99
-2.11
1.871
18.82
23.59
-17.23
64.09
30.22
-5.30
3.742
18.41
23.08
-16.85
62.70
29.57
-5.18
3.274
36.42
45.66
-33.34
124.04
58.49
-10.26
3.517
Notes:
Highlighted members are critical. Unsigned force indicates to Tension. Negative signed force indicates to Compression.
s e r u t c u r t S h t
5 _ g e e f w a T i z a y N
3
Design of Truss
Practice of structural steel design
Design of Top Chords
Design Information
Code of Practice
BS 5950-1:2000
Steel Grade
S 275
Continuity
Top chords are one continues member.
Member
Suggested Section
Two angles (Hot-rolled).
End connections
Angles are connected through one leg and to both sides of Gusset plate.
Connection Type
Bolted connection (4 No. 30 mm diameter – Grade: 4.6 –in standard clearance holes of non-preloaded bolts) in line along the angle.
:
Design According to BS 5950-1:2000
1. Design for Compression:
Selection of the section; (Green book) Try
Two Equal Angles ( 2/120 120 12
)
Design Strength; (Table-9)
Section classification; (Table-11)
The section is semi-compact.
Slenderness ratio; (Clause 4.7.2)
The slenderness is
s e r u t c u r t S h t
5 _ g e e f w a T i z a y N
4
Design of Truss
Practice of structural steel design
Compressive strength; (Table-24/strut curve C)
Compressive capacity; (clause 4.7.4)
Section is satisfactory.
2. Check for Tension:
Tension capacity; (clause 4.6.3)
Section is satisfied.
3. Conclusion:
Provide 2 No.
angles
s e r u t c u r t S h t
5 _ g e e f w a T i z a y N
5
Design of Truss
Practice of structural steel design
Design of Bottom Chords
Design Information
Code of Practice
BS 5950-1:2000
Steel Grade
S 275
Continuity
Bottom chords are one continues member.
Member
Suggested Section
Two angles (Hot-rolled).
End connections
Angles are connected through one leg and to both sides of Gusset plate.
Connection Type
Bolted connection (4 No. 30 mm diameter – Grade: 4.6 –in standard clearance holes of non-preloaded bolts) in line along the angle.
:
Design According to BS 5950-1:2000
1. Design for Tension:
Assume Design Strength; (Table-9)
Selection of the section; (Green book)
Try
Two Equal Angles ( 2/100 100 10 )
Tension capacity; (clause 4.6.3)
Section is satisfactory.
s e r u t c u r t S h t
5 _ g e e f w a T i z a y N
6
Design of Truss
Practice of structural steel design
2. Check for Compression:
Section classification; (Table-11)
The section is semi-compact.
Slenderness ratio; (Clause 4.7.2)
Compressive strength; (Table-24/strut curve C)
The slenderness is
Compressive capacity; (clause 4.7.4)
Section is satisfactory.
3. Conclusion:
Provide 2 No.
angles
s e r u t c u r t S h t
5 _ g e e f w a T i z a y N
7
Design of Truss
Practice of structural steel design
Design of Struts
Design Information
Code of Practice
BS 5950-1:2000
Steel Grade
S 275
Member
Continuity
Discontinues member.
Suggested Section
One angle (Hot-rolled).
End connections
Angle is connected through one leg to Gusset plate.
Connection Type
Bolted connection (3 No. 20 mm diameter – Grade: 4.6 –in standard clearance holes of non-preloaded bolts) in line along the angle.
:
Design According to BS 5950-1:2000
1. Design for Compression:
Selection of the section; (Green book) Try
One Equal Angle (120 120 10 L )
Section classification; (Table-11)
Design Strength; (Table-9)
The section is semi-compact.
Slenderness ratio; (Clause 4.7.10.2)
s e r u t c u r t S h t
5 _ g e e f w a T i z a y N
8
Design of Truss
Practice of structural steel design
Compressive strength; (Table-24/strut curve C)
The slenderness is
Compressive capacity; (clause 4.7.4)
Section is satisfactory.
2. Check for Tension:
Tension capacity; (clause 4.6.3)
Section is satisfied.
3. Conclusion:
Provide
Note: All Struts should be provided by the same angle (
angle
L).
s e r u t c u r t S h t
5 _ g e e f w a T i z a y N
9
Design of Truss
Practice of structural steel design
Design of Ties
Design Information
Code of Practice
BS 5950-1:2000
Steel Grade
S 275
Member
Continuity
Discontinues member.
Suggested Section
One angle (Hot-rolled).
End connections
Angle is connected through one leg to Gusset plate.
Connection Type
Bolted connection (3 No. 24 mm diameter – Grade: 4.6 –in standard clearance holes of non-preloaded bolts) in line along the angle.
:
Design According to BS 5950-1:2000
1. Design for Tension:
Assume Design Strength; (Table-9)
Selection of the section; (Green book)
Try
Single Equal Angle ( 90 90 8 L )
Tension capacity; (clause 4.6.3)
Section is satisfactory.
s e r u t c u r t S h t
5 _ g e e f w a T i z a y N
10
Design of Truss
Practice of structural steel design
2. Check for Compression:
Section classification; (Table-11)
The section is semi-compact.
Slenderness ratio; (Clause 4.7.10.2)
Compressive strength; (Table-24/strut curve C)
The slenderness is
Compressive capacity; (clause 4.7.4)
Section is satisfactory.
3. Conclusion:
Provide
Note: All Ties should be provided by the same angle (
angle
L).
s e r u t c u r t S h t
5 _ g e e f w a T i z a y N
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