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2. Linear methods of setting out curves
The chapter discusses methods for setting out simple circular curves, including linear methods like ordinates from the long chord, successive bisections of arcs, offsets from tangents, and chords produced. It also covers angular methods like Rankine's method of tangential angles and the two theodolite method. Additionally, compound and reverse curves, their elements, and procedures for setting them out, alongside transition curves and the concept of super-elevation, are explored.
Sections
This section covers the linear methods used to set out simple circular curves in construction, focusing on four key techniques.
Angular methods provide techniques for setting out circular curves using instruments and calculating angular measurements.
This section introduces compound curves, which consist of two circular arcs of different radii that are tangential to three straight lines.
This section discusses reverse curves, including their definition, applications, and the challenges they present in road and railway design.
Transition curves are non-circular curves designed to provide a smooth change from straight to curved path, essential for vehicle comfort and safety.
Various linear and angular methods exist for setting out curves.
Compound curves involve two circular arcs with different radii meeting at a common point.
Super-elevation is necessary to counteract centrifugal forces acting on vehicles in curves.
Linear Methods
Methods for setting out curves that use linear measurements such as chains or tapes.
Angular Methods
Techniques for setting out curves that involve the use of angles measured with a theodolite.
Compound Curve
A curve made up of two circular arcs with different radii that meet at a common point.
Super-elevation
The raising of the outer edge of a road curve to counteract centrifugal force on vehicles.
Practice Exercises
Total Questions
2
Estimated Time
4 min
Passing Score
70%
Instructions
- Read each question carefully
- You can use hints if you need help
- Complete all questions before submitting
1 more question available
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