For a prestressed concrete bridge beam, a minimum clear spacing of the cable of group of cables should be
The grouping of cable is permissible but not more than two cables should touch each other in vertical plan and minimum spacing in vertical planes between such grouped cable should be 50mm
Question 312
The cable for a prestressed concrete simply supported beam subject to a uniformly distributed load over the entire span should ideally be
It should be ideal if it has parabolic profile with zero eccentricity at the ends and maximum eccentricity at the centre of the span.Due to this dead load is carried free of cost
Question 313
At the time of initial tensioning, the maximum tensile stress in tendon immediately behind the anchorage shall not exceed
As per IS code 1343,the maximum tensile stress in tendon immediately behind the anchorage shall not exceed 80% of the ultimate tensile strength of wire or bar or strand
Question 314
In the design of two way slab restrained at all esges, torsional reinforcement required is
As per IS code 456:1978 the torsional reinforcement required is 0.75 times that of the area of steel provided at the mid span in the same direction
Question 315
A reinforced concrete slab is 75mm thick. The maximum size of reinforcement bar that can be used is
The diameter of reinforcing bar shall not exceed the one right of the total thickness of slab i.e 75/8=9.375, hence use 8mm dia bar
Question 316
The final deflection due to all load including the effect of temperature, creep and shrinkage measured from as cast level of supports of floors,roofs and all other horizontal members should not exceed
As per IS code 456:1978,the final deflection due to all loads including the effects of temperature,creep and shrinkage for all the horizontal members shouldnot exceed span/250
Question 317
Give that
d=effective depth. b= width and Depth= Overall depth,
The maximum area of compression reinforcement in a beam is
As per IS code 456:1978, the maximum area of compression reinforcement in a beam should not exceed 0.04bD
Question 318
The reduction coefficient of a reinforced concrete column with an effective length of 4.8m and size 250 mm x 300 mm is
From formula, reduction coefficient is equal to Cr,
Cr=1.25 - (Leff/48b)
=1.25 - {(4.8x1000)/(48x250)}
=.85
Question 319
A 200mm thick brick masonry wall made of modular bricks carries an axial load of 30KN/m from wall above and an eccentric load of 20KN/m from RCC floor acting at a distance of 47.5mm from centre line of the wall. The resultant eccentricity ratio is
Thickness of wall=200mm ,e1=47.5mm
Let w1=30KN/m, w2=20KN/m
Let the resultant load w is acting at resultant eccentricity e which is equal to ,
e= (w1x0+w2xe1)/(w1+w2)
=(30x0+20x47.5)/(30+20)
= 19,
Hence
Resultant eccentricity ratio = e/thickness of wall
Therefore resultant eccentricity ratio=19/200
=0.095
Question 320
A 200mm thick wall made of modular bricks is 5m long between cross walls and 3.8m clear height between RCC slabs at top and bottom. The slenderness ratio of the wall is
Slenderness ratio of wall = Height/thickness=(3.8*1000)/200=19
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