Geometric Design Projects for Highways PDF

Geometric Design Projects for Highways pdf

Download Geometric Design Projects for Highways PDF: An Introduction – This book Introduces the geometric design of rural highways with an emphasis on basic specifications, approaches to preliminary route selection, alignment, drainage, cost, and environmental concerns. Buy from Amazon

Geometric Design Projects for Highways PDF

The second edition is based on metric units, expands on environmental reporting concerns, and adds computerized alignment modeling. Annotation c. Book News, Inc., Portland, OR (booknews.com)

Table of Content

Contents
Preface ix
Chapter 1: Factors Affecting Selection of the
Highway Route 1
Examination of Natural and Man-Made Features 1
Identification of Technically Feasible Routes 7
Objectives in Identifying Acceptable Routes 10
Route Selection and the Design Process 12
Bibliography of Selected Publications 15
Chapter 2: Design Controls and Guidelines 19
Design Controls 19
Elements of Design 27
Cross Section Elements 42
Depth and Height of Cut and Fill Sections 48
Intersections at Grade 52
Economic Analysis 52
Environmental Requirements 56
References 56
Chapter 3: Application of Geometric Design Principles
to Route Design 59
Preliminary Route Layout and Geometric Design 59
Example of Developing and Checking Alternative Alignments 64
Non-Standard Situations 75
Drainage Provisions 75
Construction Cost Estimate 78
Economic Cost 78
Environmental Impact Analysis 79
Automated Geometric Design 82
in
Chapter 4: Example of a Rural Highway Geometric Design 86
Example of Preliminary Rural Highway Design 86
Obj ectives of Example 8 7
Scope of Preliminary Design 88
Title Page 90
Table of Contents 90
Location Map 90
Background and Specifications 92
Major Environmental Features 95
Alternative Routes 95
Screening of Alternatives 99
Horizontal Alignment 99
Profile (Vertical Alignment) 103
Examples of Curve Designs 105
Coordination of Horizontal and Vertical Alignments 105
Cross Sections 105
Earthwork Computations 114
Outline of Drainage Requirements 116
Intersection Design 121
Construction Cost Estimate 121
Summary of Likely Environmental Issues 123
Economic Cost of Project 125
Summary of Key Technical Features 129
Chapter 5: Preliminary Highway Geometric Design
Projects 131
Route Selection and Design Projects 131
Report Format and Check List 136
Appendices
Topographic map symbols 143
Construction of Cross Sections 148
Index 149

Preface – Geometric Design Projects for Highways PDF

The main purpose of this book is to assist in consolidating the many elements of highway design and linking them into a route selection and geometric design project. This second edition is based upon metric units of measurement. In addition, it enlarges upon environmental reporting concerns and presents a discussion of economic cost analysis and its application. The latter will assist in comparing different projects conducted in a class setting, and is intended to add further realism to the overall design and evaluation process. Also added are the main features of route selection and design aided by digital terrain and computerized alignment modeling.Geometric Design Projects for Highways PDF

This latter approach is becoming more prominent as its cost is reduced and experience is gained in its use by highway agencies and consulting firms. Intended for use by senior undergraduate students in civil engineering and graduate students who require a basic highway design course, the book is structured to complement highway design theory described in existing texts and design guidelines, and to supplement these in a typical highway design course. The book is also intended to assist an introductory short-course on geometric design for practicing engineers. It is assumed that the student has a working knowledge of geometry, trigonometry, soil mechanics, hydraulics, and surveying principles.Geometric Design Projects for Highways PDF

These are subjects which most undergraduate civil engineering students have studied during or before their senior year. Understanding the interrelationship between geometric design and topography is a fundamental requirement in highway engineering, for these essential elements establish the horizontal and vertical alignment of the centerline, upon which all other details of the highway and the right-of-way depend. The principles remain the same for highways ranging from a simple, two-lane, local road to a multi-lane freeway. Geometric Design Projects for Highways PDF

Also, the design of any highway route is a unique undertaking in that detailed features of the terrain and other environmental conditions invariably differ; only by working through a practical example which contains the essential design elements can the student be sure of understanding the problems involved, and of developing realistic solutions. The examples illustrate the process of conducting a preliminary highway design based upon the geometric design controls, topographic maps, and, where possible, aerial photography. Thus, the examples provide exposure to and some practice in determining IX how the technical feasibility of alternative routes may be verified in terms of the initial location of the proposed highway’s centerline and its major physical features in order to: 1. determine a reasonably accurate cost estimate for a technically feasible highway project, on which to base a preliminary economic analysis; and 2. enable a more detailed survey to be made along the defined centerline to verify topographic features, explore in more detail the soil and subsurface conditions, identify key environmental concerns, and make any necessary adjustments before a more detailed design of the highway is undertaken. Figure 1 outlines the main features of the implementation process to illustrate where a “preliminary” highway design lies within a state or other official agency’s activities. The emphasis in the book is to illustrate how the design guidelines (Item 1) and site characteristics (Item 2) together help to establish the design controls (Item 3) as a basis for the preliminary route selection and design (Items 4 and 5), and how the evaluation of alternatives (Item 6) may result in a need to modify the design controls (Item 8). The greatest emphasis will be on the route selection, geometric design, and economic cost estimation processes of Items 4, 5, and 6. Final evaluation and designs (Items 8 and 9, respectively) are not addressed in detail, and invariably involve refinements to the preliminary design.Geometric Design Projects for Highways PDF

An example of a highway implementation process is described further in Chapter 1. This book concentrates on design of rural highways. This is because rural highways typically present more extensive problems of earthworks and fitting the alignment into a natural, often mountainous terrain than do urban highways. Urban highways are typically constrained by property lines and existing rights-of-way which often limit the opportunity to explore the implications of alternative alignments Also, except for limited access highways, lower speed limits imposed in the urban setting often do not pose the problems of curvature and its coordination experienced in rural environments, although they may have unique problems of their own, particularly intersection design and traffic control. Many excellent texts deal with these matters and several are mentioned in the bibliography. Although the design process may vary somewhat depending on each state’s or other organization’s procedures (for example, in many cases, detailed, large-scale surveys rather than USGS topographic maps may be used), Figure 1 typifies the sequence of activities.

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