Design of tension member

1. Design of tension member

2. Truss

4. • Common section used as tension member
Single & Double Angles
Channel I-Section
(Joist / Beam)
Rod Cable
Composite section

5. Modes of failure of tension member
• Yielding of gross cross section
• Rupture of critical section
• Block shear

6. Yielding of gross cross section

7. Rupture of critical section

8. Block shear

11. Shear Lag Effect

12. DESIGN STRENGTH OF TENSION
MEMBER
Design Strength due to Yielding of Gross
Section (𝑇𝑑𝑔)
𝑇𝑑𝑔 =
𝐴𝑔 𝑓𝑦
𝛾𝑚0

13. Design Strength due to Rupture Strength of Critical
Section(𝑇𝑑𝑛)
A. Design Strength due to Rupture Strength of Critical
Section for plate
𝑇𝑑𝑛 = 0.9
𝐴𝑛 𝑓𝑢
𝛾𝑚1

14. Net effective Area (𝐴𝑛) of the Plate member
𝐴𝑛= (b-n. d0).t
𝐴𝑛= (b- 2. d0).t 𝐴𝑛= (b- 3. d0).t 𝐴𝑛= (b- 3. d0).t

16. B. Design Strength due to Rupture Strength of Critical
Section for Single angle section
𝑇𝑑𝑛 = 0.9
𝐴𝑛𝑐 𝑓𝑢
𝛾𝑚1
+
𝛽𝐴𝑔𝑜 𝑓𝑦
𝛾𝑚0

17. β=1.4-0.076
𝑤
𝑡
.
𝑏𝑠
𝐿𝑐
𝑓𝑦
𝑓𝑢.
≤
𝑓𝑢.𝛾𝑚0
𝑓𝑦.𝛾𝑚1
𝑤1= Gauge distance

18. Design tensile strength due to block shear (𝑇𝑑𝑏)
 Block shear Strength is least of (𝑇𝑑𝑏1) and (𝑇𝑑𝑏2)

19. ASSIGNMENT 2
Q1 Explain in detail Shear Lag Effect.
Q2 Design strength of tension member
Q3 Explain Net Effective Area And Gross Area In Detail
Q4 Explain step by step procedure to be followed in design of tension
member.
Q5 Explain in detail design strength of tension member
Q6 Calculate design tension strength of a roof truss diagonal 100 X 75
X 10 mm connected to the gusset plate by 4nos of 20 mm diameter 4.6
grade bolts in one row along the length of the member. The short leg of
the angle is kept outstanding.

20. Q7Design a horizontal tension member carrying a load 250 KN, The length of
the member is 3 m. The member is connected to 12mm thick gusset plate by
means of M20 4.6 bolts. Also design bolted connection.
Q8The main tie of a roof truss consists of ISA 150 X 115 X 8 mm and is
connected to a gusset plate by 8mm fillet weld as shown in figure. Find out the
design strength of tension member
Q9 Calculate design strength of an ISA 125X75X8mm connected to 10mm GP
with 4nos of 16mm dia. 4.6 grade bolts. Take pitch=2.5 X nominal dia. of bolt
and edge distance equal to 45mm.
Q10 Design a angle section to carry factored load of 250Kn bolted on 10mm
thk. Gusset plate also design bolted connection.