What is K value in Civil 3D?

K-Value. This value represents the horizontal distance along which a 1% change in grade occurs on the vertical curve. It expresses the abruptness of the grade change in a single value. Speed tables or other design tools often provide a target minimum K value.

What is K value in road profile?

Answer. The K-value is the horizontal distance required to achieve a 1% change in the slope of the vertical curve. “K” factors for various anticipated operating speeds are given in the AASHTO Green Book.

How do you calculate the k value of a road?

Expressed algebraically, K=L/A. The value of K is helpful in determining desirable lengths of vertical curves for various design speeds.

What is a value in Civil 3d?

Answer. The ‘A’ value of a transition curve defines the ‘flatness’ of the spiral and is expressed as where R = Radius and L = Transition Length.

How do you create a vertical curve in Civil 3d?

To Add Fixed Vertical Curves to Profiles

1. Click the profile. Click Profile tab Modify Profile panel Geometry Editor Find.
2. On the Profile Layout Tools toolbar, click Fixed Vertical Curve (Three Points).
3. Specify the start point.
4. Specify the second point.
5. Specify the end point.

What is K value in transportation?

In transportation engineering, the K factor is defined as the proportion of annual average daily traffic occurring in an hour. This factor is used for designing and analyzing the flow of traffic on highways. … K generally decreases as AADT increases.

How do you find the vertical curve?

The vertical curve equation can be expressed as:

1. y = e_pvc + g₁x + [(g₂ − g₁) × x² / 2L]
2. Where,
3. y represents the vertical elevation of point,
4. e_pvc refers to initial elevation,
5. g₁ refers to initial grade,
6. g₂ is the final grade, and.
7. x/L is the distance between the beginning and end of the curve.
8. Example:

How do you edit fields in Civil 3d?

To Edit a Field

1. Double-click a text object to display the appropriate text editing dialog box.
2. Double-click the field that you want to edit. The Field dialog box is displayed.
3. Make any needed changes.
4. Click OK to exit the Field dialog box.
5. Exit the text editor.

What is a vertical curve?

Vertical curves are used in highway and street vertical alignment to provide a gradual change between two adjacent grade lines. … In figure below, vertical curve terminology is introduced: g1 is the slope (percent) of the lower station grade line. g2 is the slope of the higher station grade line.

What is a PVI in Civil 3D?

Civil 3D 2010 Instructor Guide ▪ 16. PVI Point of Vertical Intersection is the intersection point of two profile tangents, typically marking the center of a symmetrical parabolic vertical curve. BVC Beginning of a Vertical Curve is the transition point from a constant grade line (tangent) to a vertical curve.