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The transition curve used in the horizontal alignment of highways as per IRC recommendation is
- a)spiral
- b)lemniscate
- c)cubic parabola
- d)any of the above
Correct answer is option 'A'. Can you explain this answer?
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The transition curve used in the horizontal alignment of highways as p...
Transition curve is a curve in plan which is provided to change the horizontal alignment from straight to circular curve gradually means the radius of transition curve varies between infinity to R or R to infinity.
IRC recommends Spiral or clothoid as the ideal transition curve due to following reasons:
(i) It satisfies that rate of change of centrifugal acceleration is constant i.e., Ls.R = constant.
Where Ls = length of transition curve R = radius of curve.
(ii) The calculation and field implementation of spiral curve is simple and easy.
(iii) It enhances aesthetics also.
IRC recommends Spiral or clothoid as the ideal transition curve due to following reasons:
(i) It satisfies that rate of change of centrifugal acceleration is constant i.e., Ls.R = constant.
Where Ls = length of transition curve R = radius of curve.
(ii) The calculation and field implementation of spiral curve is simple and easy.
(iii) It enhances aesthetics also.
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The transition curve used in the horizontal alignment of highways as p...
The Transition Curve in Horizontal Alignment of Highways
The transition curve is a geometric element used in the horizontal alignment of highways. It is designed to provide a smooth and gradual transition between a straight section of road and a circular curve. The purpose of the transition curve is to minimize the discomfort experienced by drivers when transitioning from a straight path to a curved path.
IRC Recommendation
The Indian Roads Congress (IRC) is a professional body that provides guidelines and recommendations for the design and construction of highways in India. According to IRC recommendations, the transition curve used in the horizontal alignment of highways is a spiral.
Explanation
A spiral is a type of transition curve that is defined by its constant rate of change of curvature. In other words, the rate at which the curvature of the curve changes along the spiral is constant. This allows for a smooth and gradual transition from a straight path to a curved path.
The spiral transition curve has several advantages over other types of transition curves:
- Smooth Transition: The spiral curve provides a smooth and gradual transition, which reduces the discomfort experienced by drivers and improves safety.
- Easy to Design and Construct: The spiral curve can be easily designed and constructed using simple mathematical equations.
- Flexible Design: The spiral curve allows for flexibility in design, as it can be easily adjusted to meet specific design requirements.
- Efficient Use of Space: The spiral curve allows for efficient use of space, as it minimizes the need for additional right-of-way or land acquisition.
- Cost-Effective: The spiral curve is cost-effective compared to other types of transition curves.
Therefore, based on these advantages, the IRC recommends the use of a spiral as the transition curve in the horizontal alignment of highways.
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The transition curve used in the horizontal alignment of highways as per IRC recommendation isa)spiralb)lemniscatec)cubic parabolad)any of the aboveCorrect answer is option 'A'. Can you explain this answer?
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