Curve Setting - Angular and linear Methods of Settings out curves (2024)

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Curve Setting - Angular and linear Methods of Settings out curves? ›

Curve Setting

There are two main methods: linear and angular. The linear method uses only a tape or chain and does not require angle measurement. It includes setting out curves by offsets from the long chord, by successive bisection of arcs, and by offsets from the tangents.

A curve may be designated either by the radius or by the angle subtended at the centre by a chord of particular length In India, a curve is designated by the angle (in degrees) subtended at the centre by a chord of 30 metres (100 ft.) length. This angle is called the degree of the curve (D).

There are 3 methods by which pegs on the centreline of circular curves can be set out:1. Tangential angle method2. Offsets from the tangent lengths 3. Offsets from the long chordWhen traditional methods are being used it is first necessary to locate the intersection and tangent points of a curve.

Linear methods determine the coordinates of points along the curve, while angular methods use deflection angles and tangent offsets. Each method has its advantages and is selected based on project requirements and terrain characteristics.

The three methods of setting out are HORIZONTAL ALIGNMENT, VERTICAL ALIGNMENT, and CROSS-SECTIONS. Horizontal alignment involves establishing the position of a structure on its baseline, while vertical alignment is used to establish the position of a building or other structure at an angle relative to it.

Rankine's method or tangential angle method is an angular technique for laying out circular curves by a combination of chaining and angles at circumference, fully exploiting the theodolite and making a substantial improvement in accuracy and productivity over existing methods.

In two theodolite method, curves are staked out by angular measurements only. Accuracy attained in this method is quite high. Thus, the method is used when higher accuracy is required and when the topography is rough or field condition is difficult.

What are the 4 curve types? ›

Procedure of setting out the Curve: (i) Divide the long chord into an even number of equal parts. (ii) Calculate the offsets by equation (5.10) at each of the points of division. () Set out the offsets at respective points to obtain the required points on the curve.

Answer: The different types of curves are Simple curve, Closed curve, Simple closed curve, Algebraic and Transcendental Curve. Question 4: Is straight line is a curve? Answer: No. A curve is not a straight line, at the same time as a straight line is not a curve.

The methods used in setting out a curve are classified as linear method and angular methods. 1. Linear method adopts the usage of chain or tape in which only distance can be found but not angles. Moreover, this process is used when accuracy is not required and speed of work is concerned.

Ensuring right angles (90 degrees) is important when setting out the initial perimeter of the house. This can easily be achieved using the 3:4:5 triangle method. A triangle, which has sides of length 3 metres, 4 metres and 5 metres, will always have a right angle between the 3-metre side and the 4-metre side.

Linear measurement is achieved by various instruments, depending on the type of instrument used for measurement. It can be divided into a direct measurement method, an optical measurement method, and an electronic measurement method. It is obtained by using some simple measurement equipment.

The Wavy Curve Method (also known as the Method of Intervals) is a mathematical technique widely applied to solve inequalities of the form f(x)g(x)> 0, f(x)g(x)< 0, f(x)g(x) 0, or f(x)g(x) 0. By using the zeroes (roots) of the functions f(x) and g(x), a graph over different intervals is sketched.

Answer: The different types of curves are Simple curve, Closed curve, Simple closed curve, Algebraic and Transcendental Curve. Question 4: Is straight line is a curve? Answer: No.