For M 150 grade concrete (1 : 2 : 4) the moment of resistance factor is
A. 0.87
B. 8.50
C. 7.50
D. 5.80
Answer: Option B
Solution (By Examveda Team)
M150 grade concrete refers to a mix ratio of 1:2:4 (Cement : Sand : Aggregate), where the characteristic compressive strength (fck) is 15 N/mm².The moment of resistance factor (R), also known as the limiting moment of resistance per unit width and square of effective depth, is a design parameter used in the limit state method for RCC beam design.
According to standard design aids and tables based on IS 456:2000, for M15 grade concrete, the commonly referred value of the moment of resistance factor is approximately 8.50.
Option A: 0.87 is incorrect, as it usually refers to the partial safety factor or percentage of steel yield stress, not the moment of resistance.
Option C: 7.50 and Option D: 5.80 are not the correct standard values for M150/M15 grade concrete.
Therefore, the correct answer is Option B: 8.50.
This Question Belongs to Civil Engineering >> RCC Structures Design
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Comments (4)
Distribution of shear intensity over a rectangular section of a beam, follows:
A. A circular curve
B. A straight line
C. A parabolic curve
D. An elliptical curve
If the shear stress in a R.C.C. beam is
A. Equal or less than 5 kg/cm2, no shear reinforcement is provided
B. Greater than 4 kg/cm2, but less than 20 kg/cm2, shear reinforcement is provided
C. Greater than 20 kg/cm2, the size of the section is changed
D. All the above
In a pre-stressed member it is advisable to use
A. Low strength concrete only
B. High strength concrete only
C. Low strength concrete but high tensile steel
D. High strength concrete and high tensile steel
In a simply supported slab, alternate bars are curtailed at
A. $${\frac{1}{4}^{{\text{th}}}}$$ of the span
B. $${\frac{1}{5}^{{\text{th}}}}$$ of the span
C. $${\frac{1}{6}^{{\text{th}}}}$$ of the span
D. $${\frac{1}{7}^{{\text{th}}}}$$ of the span
Correct answer A (0.87)
Resistance factor=0.7*square root of fck
=0.7×√150
=8.57
As per is code 456- 2000 R is the moment of resistance factor, does not depend on dimensions,its called design constant , the value of R for M15
1. mild steel =0.867
2. Fe 415=0.65
3. Fe 500=0.58
Can you please explain???