You asked: How do you make a compound curve in Autocad?

How do you create a compound curve in Autocad?

Click Home tab Draw panel Curves drop-down Create Reverse Or Compound Curve . At the Command prompt, enter ReverseOrCompound. Select the arc object nearest the end to which the new compound or reverse curve is to be attached. Specify whether to create a Reverse or Compound curve.

How do you make a compound curve?

To Create Reverse or Compound Curves

1. Enter Tangent, or T, and then enter the tangent length, or pick the distance in the drawing.
2. Enter Chord, or C , and then enter the chord length, or pick the distance in the drawing.
3. Enter Length, or L, and then enter the curve length, or pick the distance in the drawing.

What is a compound curve?

Definition of compound curve



: a curve made up of two or more circular arcs of successively shorter or longer radii, joined tangentially without reversal of curvature, and used on some railroad tracks and highways as an easement curve to provide a less abrupt transition from tangent to full curve or vice versa.

What is the difference between a compound curve and a simple curve?

Compound and reverse curves are treated as a combination of two or more simple curves, whereas the spiral curve is based on a varying radius. The simple curve is an arc of a circle. It is the most commonly used. The radius of the circle determines the “sharpness” or “flatness” of the curve.

What are the elements of compound curve?

Elements of compound curve

• PC = point of curvature.
• PT = point of tangency.
• PI = point of intersection.
• PCC = point of compound curve.
• T₁ = length of tangent of the first curve.
• T₂ = length of tangent of the second curve.
• V₁ = vertex of the first curve.
• V₂ = vertex of the second curve.

What is composite curve in surveying?

Definition: Combination of two or more simple circular curves of different radius having their curvature in the same direction. Essentially, a compound curve consists of two curves that are joined at a point of tangency and are located on the same side of a common tangent.

What is the simple and compound curves in construction surveying?

A compound curve consists of two or more simple curves having different radii bending in the same direction and lying on the same side of the common tangent. Their centres lie on the same side of the curve. In fig. 11.2, T₁ P T₂ is the compound curve with T₁O₁ and PO₂ as its radii.

Where do we use compound curve?

Since their tangent lengths vary, compound curves fit the topography much better than simple curves. These curves easily adapt to mountainous terrain or areas cut by large, winding rivers. However, since compound curves are more hazardous than simple curves, they should never be used where a simple curve will do.

Why compound curve is provided?

(i) Many times it is not possible to provide a curve of constant radius to connect the two straight lines, in that case, we provide more than one curve of different radii to connect them. (ii) When all the curves turn in the same direction then the resulting curve is called compound curve.

What is the difference between compound curve and reverse curve?

A compound curve is formed by the combination of two circular curves of different radii curving in the same direction. A reverse curve is formed by the combination of two circular curves with opposite curvatures. A common transition curve may be provided between the two circular curves of a reverse curve.

How do you set out a curve?

Procedure of setting out the curve:



(i) Locate the tangent points T₁ and T₂. (ii) Measure equal distances, say 15 or 30 m along the tangent from T₁. (iii) Set out the offsets calculated by any of the above methods at each distance, thus obtaining the required points on the curve.

What is back tangent in compound curve?

The radius is the radius of the circle of which the curve is an arc. The point of curvature is the point where the circular curve begins. The back tangent is tangent to the curve at this point. The point of tangency is the end of the curve.