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Built Up Columns - Lacing

In the design...

Question

In the design of lacing system for a built-up steel column, the maximum allowable slenderness ratio of a lacing bar is ______.

A

180

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B

145

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C

250

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D

120

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Solution

The correct option is B 145
Maximum allowable slenderness ratio of a lacing bar is 145.

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Q. A steel column in a multi-storeyed building carries an axial load of 200 N. It is built up of 2 ISMC 350 channels connected by lacing. The effective length and thickness of lacing flat is 420 mm and 12 mm respectively. The slenderness ratio of lacing flat is ______.

Q. For a steel built-up column subjected to an axial force of 1200 kN, the lacing system is to be designed for resisting transverse shear of ( in KN )______.

Q. If a built-up single laced column is subjected to 1200 kN axially and inclination of the lacing bar is 45° with vertical, then each lacing bar will be designed for an axial force of __________.

Q. Four angles of ISA 90 x 90 x 10 mm are used for a built up column as shown in the fig. The column is subjected to a compressive force of 1200 kN. If a flat of 80 x 10 mm size is used as lacing bar for the single lacing system and inclination of the lacing bar is 45

^{\circ}

with vertical, then the each lacing bar is designed for an axial force of _________.

Q. Consider the following statements for a laced column:

1. The capacity of a laced column is taken as 1.05 times the actual capacity.

2. The lacing bar is designed for the condition that slenderness ratio should be less than 145.

3. Lacing are most effective when the angle of inclination of lacing bar with longitudinal axis is between 35

^{\circ}

^{\circ}

.

4. For a single lacing system, the thickness of flat should not be less than 1/40th its effective length.

Which of the above statements are correct?

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