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Q: It is proposed to use a double angle section for compression member. The best section to use is:
  • A. unequal angles with short legs connected by welding
  • B. unequal angles on same side of gusset plate
  • C. unequal angles with long legs connected by welding
  • D. equal angles on opposite sides of gusset plate
Correct Answer: Option C - As per IS 800 : 2007- Double angle section– When two angle section are connected with each other in any configuration is termed as double angle section. • Equal angles on the same side of the gusset plate it has very low radius of gyration about the axis parallel to gusset plate and it act as weak axis of buckling, hence least preferred. • Equal angle on opposite side of the gusset plate. It is good compared to equal angle on the same side as no weak axis w.r.t. radius of gyration. But its axial capacity is less compared to unequal double angles. • Unequal angles with short legs back to back, it has slightly improved axial capacity compared to equal section but has low radius of gyration about the axis perpendicular to the short edges, hence not preferred.
C. As per IS 800 : 2007- Double angle section– When two angle section are connected with each other in any configuration is termed as double angle section. • Equal angles on the same side of the gusset plate it has very low radius of gyration about the axis parallel to gusset plate and it act as weak axis of buckling, hence least preferred. • Equal angle on opposite side of the gusset plate. It is good compared to equal angle on the same side as no weak axis w.r.t. radius of gyration. But its axial capacity is less compared to unequal double angles. • Unequal angles with short legs back to back, it has slightly improved axial capacity compared to equal section but has low radius of gyration about the axis perpendicular to the short edges, hence not preferred.

Explanations:

As per IS 800 : 2007- Double angle section– When two angle section are connected with each other in any configuration is termed as double angle section. • Equal angles on the same side of the gusset plate it has very low radius of gyration about the axis parallel to gusset plate and it act as weak axis of buckling, hence least preferred. • Equal angle on opposite side of the gusset plate. It is good compared to equal angle on the same side as no weak axis w.r.t. radius of gyration. But its axial capacity is less compared to unequal double angles. • Unequal angles with short legs back to back, it has slightly improved axial capacity compared to equal section but has low radius of gyration about the axis perpendicular to the short edges, hence not preferred.