tre u2.pptx transportation engineering civil

Transportation engineering

1. UNIT II Geometric Design of Highways

2. Overturning Effect The above equilibrium condition will occur when Ph= Wb /2 P/W=b/2h It means there is danger of overturning when centrifugal ratio P/W or v 2 / gR attains a values of b/2h

3. Transverse sliding effect

4. Considering the equilibrium of components of forces acting parallel to the plane. (P cos ϴ ) the component of centrifugal force is opposed by (W sin ϴ ) the component of gravity & frictional forces F A & F B

5. The value of coeff . of lateral friction, f is taken as 0.15. Value of tan ϴ seldom exceeds 0.07 Hence, Value of f.tan ϴ is 0.01 Therefore, value of (1 - f.tan ϴ ) = 0.99 i.e 1