The following statements s1 s2 s3 pertain to an under reinforced beam 10998c46b210

QUESTION

Objective Question

Q.1

The following statements (S1, S2, S3) pertain to an under-reinforced beam of concrete.

Choose the correct statements.

S1: These beams are deeper when compared to a balanced beam section.

S2: The failure of the beam takes place due to failure of steel.

S3: These beams undergo large deflections at failure.

निम्नलिखित कथन (S1, S2, S3) कंक्रीट के अल्प-प्रबलित बीम (Under-Reinforced Beam) से संबंधित हैं। सही कथनों का चयन कीजिए।

S1 : संतुलित बीम खंड (Balanced Beam Section) की तुलना में इन बीमों की गहराई अधिक होती है।

S2 : इन बीमों का विफलन (Failure) स्टील के विफलन के कारण होता है।

S3 : विफलन के समय इन बीमों में अधिक विक्षेपण (Large Deflections) होता है।

S1 and S3

S1 और S3

S1 and S2

S1 और S2

S2 and S3

S2 और S3

S1, S2 and S3

S1, S2 और S3

Answer ( Option D)

S1, S2 and S3

S1, S2 और S3

Solution

Difference Between Under-Reinforced and Over-Reinforced Sections

Under - reinforced section when compared with Balance section	Over - reinforced section when compared with Balance section
Steel yield first then concrete (complete failure is due to the crushing of concrete only)	Concrete will reach to maximum stress first
Reinforcement is less than a balanced section	Reinforcement is more than a balanced section
Primarily tension failure	Primarily Compression failure
Ductile failure	Sudden or brittle failure
Depth of Neutral axis shifts upward i.e. it is less than that of balanced section (Xu < Xu,lim)	Depth of Neutral axis shifts downward i.e. it is more than that of balanced section (Xu > Xu,lim)
Strain in steel is greater than that of in balanced section.	Strain in steel is less than that of in balanced section.
Larger section is required because it has less steel	Smaller section is required because it has more steel.
More deflection because it has less steel	Less deflection because it has more steel.
Moment of Resistance is less than that of Balanced section	Moment of Resistance is more than that of Balanced section