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Question
The permissible stresses under bending and direct compression for M20 concrete, following the working stress method of design of concrete structures as recommended by IS 456 : 2000 are respectively (specify values in N/mm2 units):
A.
8.5, 5
B.
8.5, 4
C.
7, 4
D.
7, 5
Answer ( Option D)

7, 5

Solution

The permissible stresses under bending and direct compression as per IS 456 for different grades of concrete are given below in the tabulated form.

Grade of Concrete

Permissible Stress in Compression

Bending scbc (N/mm2)

Direct scc (N/mm2)

M15

5.0

4.0

M20

7.0

5.0

M25

8.5

6.0

M30

10.0

8.0

M35

11.5

9.0

M40

13.0

10.0

M45

14.5

11.0

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