# Civil Engineering - RCC Structures Design - Discussion

Discussion Forum : RCC Structures Design - Section 3 (Q.No. 2)

2.

If the maximum bending moment of a simply supported slab is M Kg.cm, the effective depth of the slab is (where Q is M.R. factor)

Discussion:

10 comments Page 1 of 1.
Ujjawal said:
2 years ago

If we want M in N-mm then.

1kg=10N.

1cm=10mm.

Then if we consider B as a unit dimension and ignore it we will come to.

D=10√(M/Q).

1kg=10N.

1cm=10mm.

Then if we consider B as a unit dimension and ignore it we will come to.

D=10√(M/Q).

B.Singh said:
2 years ago

Moment of resistance/maximum B.M.

(M) = QBd2.

Where,

Q = Moment resistacne factor.

B = width of slab = 1 m = 100 cm,

[since m was given in kg.cm],

D = depth of slab.

√ M = Q * 100 * d^2 (kg-cm).

(M) = QBd2.

Where,

Q = Moment resistacne factor.

B = width of slab = 1 m = 100 cm,

[since m was given in kg.cm],

D = depth of slab.

√ M = Q * 100 * d^2 (kg-cm).

Rajveer said:
4 years ago

M = 0.138Fckbd*2.

M = Qd*2(0.138fckb , M.R.factor),

So, option C is correct.

M = Qd*2(0.138fckb , M.R.factor),

So, option C is correct.

(1)

Indu said:
5 years ago

What is Q here?

Keshav Kaushik said:
5 years ago

None of the above is the correct answer.

According to me,

M= Qbd^2.

Here, ignoring b.

M= Qd^2.

So, d= √(M/Q).

Now M is given in kg.cm.

And 1kg = 9.81N or roughly 10N,

and 1cm = 10mm.

Therefore;

1kg.1cm = 10N.10mm =100Nmm.

So, d= √(100M/Q) = 10 √(M/Q).

According to me,

M= Qbd^2.

Here, ignoring b.

M= Qd^2.

So, d= √(M/Q).

Now M is given in kg.cm.

And 1kg = 9.81N or roughly 10N,

and 1cm = 10mm.

Therefore;

1kg.1cm = 10N.10mm =100Nmm.

So, d= √(100M/Q) = 10 √(M/Q).

Karan Panjabi said:
5 years ago

Moment Resistance

M = Qd^2.

M/(10x10) = Qd^2.

d = √M/100Q.

So option E is correct.

M = Qd^2.

M/(10x10) = Qd^2.

d = √M/100Q.

So option E is correct.

Monu said:
6 years ago

E is correct.

In this 100 is breadth in cm.

In this 100 is breadth in cm.

Garry said:
7 years ago

According to me, both C and D can be correct.

SUBHANKAR BAG said:
7 years ago

How it is possible? Explain.

Amrit Raj said:
7 years ago

d= √ M/1000Q is the correct answer.

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