Concrete Technology (101-120)

Updated: Apr 29, 2020

101. The depth of footing for an isolated column is governed by

i) maximum bending moment

ii) shear force

iii) punching shear

102. If the foundations of all the columns of a structure are designed on the total live and dead load basis, then

the settlement of exterior columnswill be more than interior columns




103. To minimise the effect of differential settlement, the area of a footing should be designed for dead load +fraction of live load


104. The critical section for finding maximum bending moment for footing under

masonry wall is located


105. In a pile of length l , the points of suspen sion from ends for lifting it are located at 0.207 l

106. During erection, the pile of length / is supported by a crane at a distance of

0.707 l

107. While designing the pile as a column, the end conditions are nearly

one end fixed and other end hinged

108. The recommended value of modular ratio for reinforced brick work is 40

109. According to ISI recommendations, the maximum depth of stress block for

balanced section of a beam of effective depth d is 0.43 d

110. Assertion A : The load factor for live load is greater than that for dead load.

Reason R : The live loads are more uncertain than dead loads.Select your answer based on the coding system given below :

Both A and R are true and R is the correct explanation of A

111. The centroid of compressive force, from the extreme compression fibre, in limit

state design lies at a distance of 0.416 X

112. The design yield stress of steel according to IS: 456-1978 is

0.87 f

where f is the characteristic yield strength of steel

113. According to Whitney's theory, ultimate strain of concrete is assumed to be

0.3%

114. According to Whitney's theory, depth of stress block for a balanced section of a concrete beam is limited to

0.537 d

where d is effective depth of beam

115. The load factors for live load and dead load are taken respectively as

2.2 and 1.5

116. As per Whitney's theory, the maximum moment of resistance of the balanced

section of a beam of width b and effective depth d is given by where acy is the cylinder compressive strength of concrete




where σcy is the cylinder compressive strength of concrete

117. The maximum shear stress for M15 concrete as per IS: 456-1978 in limit state

design is 2.5 N/mm²

118.According to IS: 456-1978, the maxi mum compressive stress in concrete

for design purpose is taken as


119.The maximum compressive stress in concrete for design purposes is based on a partial safety factor of 1.50

120. The partial safety factor for steel as per IS: 456-1978 is taken as 1.15

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