# In an unloaded structure, as erected, the tolerance limit of deviation of distance between adjacent columns after erection is

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In an unloaded structure, as erected, the tolerance limit of deviation of distance between adjacent columns after erection is
1. 0.002 h, h is the height of the column
2. 5 mm
3. 10 mm
4. 0.0035 h
5. 0.0025 he, he is the effective length of the column

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Correct Answer - Option 2 : 5 mm

Explanation:

According to IS 12843: 1989 (Clause 3.1 Table 1), The tolerances on deviations in the erected steel structures from true positions shall not exceed the values specified below:

 Description Tolerances 1) Deviation in bearing levels of a member on adjacent pair of columns both across and along the building  2) Deviation of column axis at foundation top level with respect to true axis: (a) In longitudinal direction (b) In lateral direction 3) Deviation in the level of bearing surface of columns at foundation top with respect to true level $\pm$5 mm 4) Out of plumbness (verticality) of column axis from true vertical axis, as measured at column top: (a) For columns without any special requirements:  Up to and including 30 m height $\pm \frac{H}{{1000}}or \pm 25mm$ whichever is less Over 30m height $\pm \frac{H}{{1200}}or \pm 35mm$ whichever is less (b)For column with special requirements like cranes or such similar requirements: Up to and including 30 m height $\pm \frac{H}{{1000}}or \pm 20mm$ whichever is less Over 30 m height $\pm \frac{H}{{1500}}or \pm 25mm$ whichever is less