When designing a concrete structure in Japan, what is the standard design compressive strength

When designing a concrete structure in Japan, what is the standard design compressive strength

 When designing a concrete structure in Japan, what is the standard design compressive strength (fck) of concrete used for general beams and columns?

A. 15 N/mm²

B. 24 N/mm²

C. 30 N/mm²

D. 40 N/mm²

E. 50 N/mm²

Answer: B

Explanation: In Japan, the standard design compressive strength (fck) of concrete for general beams and columns in residential and commercial buildings is 24 N/mm². This is a standard value specified in Japanese concrete design codes and is frequently referenced in the exam.