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Q: According to IS 800 : 2007, for laced columns in welded construction. the effective length of the lacing bar is______ times the distance between the inner ends of the welds connecting lacing bars in the member.
  • A. 0.5
  • B. 0.7
  • C. 0.8
  • D. 1.2
Correct Answer: Option B - According to IS 800 : 2007 • The slenderness ratio of lacing bar should not exceed 145. • The effective length of single lacing in laced system is equal to the length between the inner and fasteners. • For double lacing system it should be considered as 0.7 times of this length. • In welded condition, the effective length shall be taken 0.7 times the distance between the inner ends of welds connecting the single lacing bar to the members.
B. According to IS 800 : 2007 • The slenderness ratio of lacing bar should not exceed 145. • The effective length of single lacing in laced system is equal to the length between the inner and fasteners. • For double lacing system it should be considered as 0.7 times of this length. • In welded condition, the effective length shall be taken 0.7 times the distance between the inner ends of welds connecting the single lacing bar to the members.

Explanations:

According to IS 800 : 2007 • The slenderness ratio of lacing bar should not exceed 145. • The effective length of single lacing in laced system is equal to the length between the inner and fasteners. • For double lacing system it should be considered as 0.7 times of this length. • In welded condition, the effective length shall be taken 0.7 times the distance between the inner ends of welds connecting the single lacing bar to the members.