Angle of Lacing bar is measured from which axis 

This question was previously asked in
UKPSC JE Civil 8 May 2022 Official Paper-I
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  1. Axis of the built-up member 
  2. Axis normal to the axis of the built-up member 
  3. Inclined axis 
  4. Any direction

Answer (Detailed Solution Below)

Option 1 : Axis of the built-up member 
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Detailed Solution

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Concept:

As per IS 800 Design specifications are:

1. The angle of inclination of the lacing with the longitudinal axis (which is normal to the build-up member) of the column should be between 40° to 70°.

2. The slenderness ratio of the lacing bar should not exceed 145.

3. Minimum width of lacing in riveted connections should be:

ϕ (mm)

22

20

18

16

Width (mm)

65

60

55

50

Which is approximated to 3 times the nominal diameter.

If θ is less than 40° it behaves like a truss member and if θ is greater than 70°, the tieing force carrying capacity decreases.

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