

RCC Structures Design - Engineering
Q1: If p1 and p2 are mutually perpendicular principal stresses acting on a soil mass, the normal stress on any plane inclined at angle θ° to the principal plane carrying the principal stress p1, is :A ![]() B ![]() C ![]() D ![]() E ![]() ANS:C - To determine the normal stress on a plane inclined at an angle θ to the principal plane carrying the principal stress p1, we can use Mohr's circle and the concept of stress transformation. Given that p1 and p2 are mutually perpendicular principal stresses, we can represent them as the major and minor principal stresses, respectively, on the Mohr's circle. The normal stress σn on a plane inclined at an angle θ to the principal plane carrying the principal stress p1 can be calculated using the formula for stress transformation: σn=p1+p2/2+p1−p2/2 cos(2θ) Where:
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