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If the stirrup spacing is equal to 0.75 times the effective depth of an RC beam. then the shear capacity of stirrup steel is equal to



where $f_y$ is strength and $A_{sv}$ is cross-sectional area of the stirrup steel.

What is the moment capacity of an under reinforced rectangular RCC beam?

A concrete beam of rectangular cross-section of $200mm\times 400mm$ is prestressed with a force of 400 kN at an eccentricity of 100 mm. The maximum compressive stress in the concrete is

1. 3.5

While checking shear resistance of reinforced concrete beams for limit state of collapse as per IS:456, which one of the following nominal shear stress recommendations is to be adhered to?

(V${}_u$ is shear force at vertical cross-section, 'b' and 'd' are overall breadth and effective depth of beam respectively)

An RC structural member rectangular in cross section of width band depth D is subjected to a combined action of bending moment M and torsional moment T. The longitudinal reinforcement shall be designed for a moment M${}_e$ given by

The ultimate strength of the steel used for prestressing is nearly

The profile of the centroid of the tendon is parabolic with a central dip. h.Effective prestressing force is $P$ and the span $L$. What is the equivalent upward acting uniform load?

1. 2

When the tendon of a rectangular prestressed beam of cross-sectional area $A$ is subjected to a load $W$ through the centroidal longitudinal axis of beam, (where $M$ = maximum bending moment and $Z$ = section modulus) then the maximum stress in the beam section will be

1. 46.7

The below figure represents a section of a prestressed beam. For a no-tension design where ${\sigma }_c$ is the permissible stress in concrete, the total moment carrying capacity is

In limit state design of concrete for flexure, the area of stress block is taken as

If ${\sigma }_{cbc}$ is permissible compressive stress in flexural compression in $N/m{m}^2$ in service, the modular ratio is of the order of

A pretensioned plank $\left(depth{D}_1\right)$ is placed over simple supports and additional in situ concrete $\left(depth{D}_2\right)$ is laid on top. What is the probable shape of stress block on hardening of in situ concrete?

What is the uplift at centre on release of wires from anchors due to pretensioning only for force $P$ and eccentricity $e$ for a pre-tensioned rectangular plank?

For a rectangular prestressed beam designed for operation stress conditions, what is the maximum prestressing force?

Limit state of serviceability for deflection including the effects due to creep, shrinkage and temperature occurring after erection of partitions and application of finishes as applicable to floors and roofs is restricted to

A rectangular simply supported prestressed concrete beam of span L is subjected to a prestressing force of P acting centrally at and sections and the prestress tendons are parabolically draped with maximum eccentricity of $e_{max}$ at the mid span section. The uniformly distributed upward load(w) on the beam due to prestressing will be:

1. 4.8

A prestressed concrete beam of cross-sectional area $A$, moment of inertial ${}^{\prime }{l}^{\prime }$, distance of top extreme fibre from neutral axis ${}^{\prime }{y}^{\prime }$ and distance of bottom extreme fibre from neutral axis ${}^{\prime }{y}_b^{\prime }$ is subjected to a prestressing force such that stress at top fibre is zero. What is the value of eccentricity ('r' is radius of gyration)?

1. 12500

Mathc List -I with List - II and select the correct answer using the codes given below the lists:

List-I

A. Loss of prestress

B. End block

C. Transmission length

D. Partially pre-stressed



List - II

1. Class 3

2 Pretensioned members

3. Bursting tension

4. Elastic structures shortening

$\text{Codes:}$

$ABCD$

Match List-I with List-II and select the correct answer using the codes given below the lists:

List-I List-II

A. Serviceability 1. Sliding

B. Shear key 2. Deflection

C. Shrinkage 3. Cracking

D. Concrete spalling 4. Corrosion



Codes:

$ABCD$

A beam of rectangular cross-section (b$\times$d) is subjected to a torque T. What is the maximum torsional stress induced in the beam (b < d and $\alpha$ is a constant)?

1. 0.0975

For a pretensioned rectangular plank the uplift at centre on release of wires from anchors due to pretensioning only (force P, eccentricity e) will be

As per $\text{IS 456-2000,}$ which one of the following correctly expresses the modulus of elasticity of concrete? (read with the relevant units)

Long term elastic modulus in terms of creep coefficient $\left(\theta \right)$ and 28-days characteristic strength $\left(f_{ck}\right)$ is given by

1. 10000

1. 0.15

Considering modular ratio as 13, grade of concrete as M20 and grade of steel as 415, what is the ratio of balanced depth of neutral axis as per working stress method to the balanced depth of neutral axis as per limit state method?

If the characteristic strength of concrete $f_{ck}$ is defined as the strength below which not more than 50% of the test results are expected to fail, the expression for $f_{ck}$ in terms of mean strength $f_m$ and standard deviation $\overline{\sigma }$ would be

1. 158.27

The probability of failure implied in limit state design is of the order of

If $f_{cu}$ and$f_y$ are cube compressive strength of concrete and yield stress of steel respectively and $E_s$ is the modulus of elasticity of steel for all grades of concrete, the ultimate flexural strain in concrete can be taken as

A pre-tensioned (assume no losses) concrete rectangular $(b\times d)$ beam is designed on the basis of no tension. Concrete strength is ${\sigma }_c.$ The maximum moment that the beam can carry is

1. 0

In the case of a P.S.C. beam, to satisfy the Limit State of Serviceability in cracking, match List-I with List-II and select the correct answer using the codes given below the lists:



List - I

A. Class 1 structure

B. Class 2 structure

C. Class 3 structure

List- II

1. No visible cracking ${\sigma }_1<3N/m{m}^2$

2. Concrete section uncracked; crack width to be calculated to check

3. No cracking under service loads

$\text{Codes}:ABC$

Match List-I (Post-tensioning system) with List-II (Arrangement of tendons in the duct ) and select the correct answer using the codes given below the lists:



List- I

A. Freyssient

B. Gifford-Udall

C. Lee-McCall

D. Magnel Blaton



List- II

1. Single bars

2. Wires evenly spaced by perforated spacers

3. Horizontal rows of four wires spaced by metal grills

4. Wires spaced by helical wire core in annular spacer



Codes:

A B C D