SSC JE Civil Engineering 23-Mar-2021 Shift 1 Paper

Question : 170 of 200

Marks: +1, -0

A cantilever beam of span L is built-in at the support. It is restrained against lateral deflection and torsion at the free end. The effective length of compression flange for the beam as per IS 800 ∶ 2007 is:

2 L
0.75 L
0.85 L
0.5 L

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Restraint Condition		Loading Condition
At Support	At Top	Normal	Destabilizing
a) Continuous, with lateral restraint to the top flange	i) Free	3.0L	7.5L
	ii) Lateral restraint to the top flange	2.7L	7.5L
	iii) Torsional restraint	2.7L	4.5L
	iv) Lateral and torsional restraint	2.1L	3.6L
b) Continuous, with partial torsional restraint	i) Free	2.0L	5.0L
	ii) Lateral restraint to the top flange	1.8L	5.0L
	iii) Torsional restraint	1.6L	3.0L
	iv) Lateral and torsional restraint	1.4L	2.4L
c) Continuous, with lateral and torsional restraint	i) Free	1.0L	2.5L
	ii) Lateral restraint to the top flange	0.9L	2.5L
	iii) Torsional restraint	0.8L	1.5L
	iv) Lateral and torsional restraint	0.7L	1.2L
d) Restrained laterally, torsionally, and against rotation on plan	i) Free	0.8L	1.4L
	ii) Lateral restraint to the top flange	0.7L	1.4L
	iii) Torsional restraint	0.6L	0.6L
	iv) Lateral and torsional restraint	0.5L	0.5L