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2. Solution

This chapter focuses on the geometry and calculations involved in setting out circular curves, tangent lengths, and vertical curves in civil engineering. It emphasizes various methods for calculating angles, lengths, and offsets, as well as practical examples illustrating these concepts. The chapter also covers the transition curves and compound curves critical in roadway design and alignment.

Sections

Solution:

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1 Section Overview

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1.1 Chainage of Apex V

This section details the calculations necessary for determining chainage and related measurements in road alignment, specifically focusing on the apex of a circular curve.

1.2 Deflection Angle D

This section explains the concept of the deflection angle in road design, detailing how to calculate various key parameters such as tangent lengths, the length of curves, and chainages.

1.3 Radius R

This section provides fundamental calculations related to circular curves in surveying, including the methods to determine the radius, lengths of tangents, and other crucial parameters.

1.4 Peg Interval

This section discusses the calculation of peg intervals in survey measurements, particularly in relation to setting out circular curves.

Example 2.10:

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2 Section Overview

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2.1 Tabulate the data needed
2.2 Chainage of PI

This section covers the calculations and methodologies used to determine the chainage of points of intersection (PI) in circular curves.

Example 2.11:

This section provides a comprehensive approach to setting out a circular curve, including calculations of chainage, tangent lengths, and offsets.

3 Section Overview

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3.1 Tabulate the necessary data
Example 2.12:

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4 Section Overview

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4.1 Two tangents intersect

This section focuses on the calculations and principles related to the intersection of two tangents and the layout of circular curves.

Example 2.13:

This section outlines the calculations necessary to set out a simple circular curve connecting two straights based on given parameters.

5 Section Overview

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5.1 Two straights intersect

This section covers the principles of calculating intersections between two straight lines and the design of curves connecting them.

Example 2.14:

This section focuses on calculating key data for setting out a compound curve using specified parameters such as radius, deflection angle, and chainages.

6 Section Overview

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6.1 A right hand compound curve

This section details the calculations and methods for setting out right-hand compound curves in highway engineering.

Example 2.15:

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7 Section Overview

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7.1 Two straights AC and BC

This section focuses on calculating parameters for setting up circular curves that connect two straight paths, emphasizing concepts like chainage, deflection angles, and tangential lengths.

Example 2.16:

This section covers the calculation of chainages related to circular curves involving two intersecting straights.

8 Section Overview

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8.1 Two straights BA and AC

This section covers the calculation of various parameters for connecting two straight lines using circular curves.

Example 2.17:

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9 Section Overview

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9.1 Two straights AC and CB

This section delves into the calculations and processes involved in setting out circular curves between two straights, focusing on determining chainages, tangent lengths, and curve lengths.

Example 2.18:

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10 Section Overview

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10.1 Two parallel railway lines

This section focuses on calculating parameters for setting circular curves between two parallel railway lines.

Example 2.19:

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11 Section Overview

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11.1 Two parallel lines

This section discusses the calculations involved in setting out circular curves connecting two parallel lines, emphasizing tangent lengths, chainages, and deflection angles.

Example 2.20:

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12 Section Overview

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12.1 A reverse curve ACB

This section covers the calculations and principles involved in setting out a reverse curve in road design, including tangent lengths, chainages, and curve lengths.

Example 2.21:

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13 Section Overview

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13.1 A reverse curve

This section discusses reverse curves in road and railway design, focusing on the calculations needed to set out curves accurately.

Example 2.22:

This section covers the calculations necessary for setting out a transition curve with key parameters such as lengths and offsets.

14 Section Overview

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14.1 A transition curve of the cubic parabola type

This section covers the mathematical principles and applications of cubic parabola transition curves in road and railway construction, emphasizing their importance in managing changes in curvature.

Example 2.23:

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15 Section Overview

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15.1 A compound curve AB and BC

This section explains the principles of calculating and setting out compound curves in surveying, detailing examples and formulas for practical application.

Example 2.24:

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16 Section Overview

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16.1 Length of vertical curve

This section explores the calculations and methodologies involved in determining the length of vertical curves, crucial for effective road design.

Example 2.25:

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17 Section Overview

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17.1 Length of vertical curve

This section delves into the calculations and concepts essential for determining the length of vertical curves in roadway design.

Example 2.26:

This section provides calculations for the reduced levels (RL) of various stations on a vertical curve connecting two grades, detailing the necessary formulas, the chainage of relevant points, and the derived elevations.

18 Section Overview

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18.1 Calculate the RL of various stations

This section outlines the methodology for calculating the Reduced Level (RL) at various stations by employing geometric principles involved in road design and surveying.

Example 2.27:

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19 Section Overview

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19.1 A 1% grade meets a +2.0% grade

This section covers the calculations and methodology involved in designing curves in highway engineering, focusing on vertical and horizontal alignment transitioning between different gradients.

Example 2.28:

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20 Section Overview

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20.1 Two straights AB and BC

This section discusses the calculation and setting out of circular curves connecting two straight lines, with practical examples illustrating the concepts.

Learning Objectives

  • Understanding the geometric principles behind circular curves and their application in road design.

  • The calculations necessary to determine tangent lengths, curve lengths, and offsets for various types of curves.

  • How to execute practical examples involving setting out curves with theodolites and other surveying tools.

Key Concepts

Circular Curve

A curved path or alignment in civil engineering used to connect two straights, characterized by a constant radius.

Tangent Length

The straight distance from the point of intersection to the point of curve or tangency.

Transition Curve

A curve that gradually changes the alignment from a straight path to a circular curve, improving safety and comfort for vehicles.

Deflection Angle

The angle through which a vehicle must turn to follow a curve, calculated based on the geometry of the curve.

Vertical Curve

A parabolic curve that connects two different grades on a roadway, improving safety and vision.

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

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