Optimization Method for Railroad Curve Alinement
Realignment of existing railroad curves is cast in terms of a quadratic optimization problem and a method of minimizing the objective function is developed. Geometry relating track curvature...

Intra-CBD Secondary Travel Patterns of Downtown Workers
Previous Downtown People Mover (DPM) feasibility studies have shown that the majority of the average daily DPM trips will be made by downtown workers during their travel to and from the...

Expressway Route Optimization by OCP
The optimum curvature principle (OCP) is applied to the horizontal alignment optimization of an expressway in flat South Florida between two given points. Construction cost is the criterion...

Transit Performance Evaluation Model
An analytical methodology, known as the Transit Performance Evaluation Model, has been extended and applied. The model is used to evaluate the effect on transit performance from short...

User Cost Analysis in Urban Freeway Rehabilitation
Based on the principles and techniques given in the 1977 AASHTO Manual on User Benefit Analysis for Highway and Bus Transit Improvements a...

Decomposition Approach to Bus Network Design
This paper presents a decomposition approach to bus network design in which the task of network design is accomplished through the optimization of a series of subproblems. Bus routes are...

Construction Methods in Tunneling under a Railroad
The alignment of a new transit facility under a busy railroad made it advisable to design and specify certain construction methods. These methods were specified to insure safety, cost...

The Querverschub of the 2,000-ft Oberkassel Bridge
In 1976 West German bridge engineers undertook the moving of the largest structure ever moved in one piece and in such a short period of time. The Oberkassel Bridge connecting Dusseldorf...

An Appraisal of the Effective Length Alignment Charts

Modified Soil Strain Gage
While it appears that the greatest effort regarding in-situ monitoring of soils has been directed as stress measurements, strain monitoring is of equal importance. The reason for the past...

Visual Quality Controls in Highway Design
If he is to locate and design highways of good visual quality, the highway designer needs: (1) A sound philosophy of design; (2) principles of visual quality; (3) tools and techniques...

Interlock Tension in Steel Sheet Piling
A need exists for representation of the interlock strength of steel sheet piling as a distribution for two main reasons. First, this strength is highly variable, and second, this aspect...

Fiber Reinforced Concrete Extrusion
Results of tests involving extrusion of fibrous concrete (FRC) indicate the feasibility of the process. Extrusion through a stationary die proves beneficial to the mechanisms governing...

Environmental Studies for Rocky Mountain Highway
Preparatory to writing an environmental impact statement, an environmental study of a 14-mile segment of Interstate Highway 70 over Vail Pass in Colorado was completed in 1972. Baseline...

Planning Economical Tunnel Surveys
Economical tunnel surveys require careful advance planning. Methods and criteria for planning the surveys are examined, as are the factors affecting the choice of method to be used. A...

Post Block Aerial Triangulation with Height Constraint
If the block triangulation and adjustment has been completed, the adjusted exterior orientation information for each of the photos can be used for subsequent post block work such as in...

Instrumentation Applied to Slope Stability Problems
Unfavorable geologic conditions along proposed transportation routes often cannot be avoided by simple changes in grades and alignments. When such situations occur or when conditions cannot...

Philadelphia–Lindenwold High-Speed Line Surveys
A main base line (monumented center line) of tangents and simple curves, separate from track geometry with its profusion of spirals, is a practical necessity for a Rapid Transit project....

Urban Riverside Environmental Analysis
The need for a major highway facility precipitated a total analysis of the riverfront area adjacent to downtown Memphis, TN. Realizing the impact potential of such a facility on the riverfront...

Behavior of Continuous Crane Rails
Continuous crane rails with welded splices are being used in industry to improve crane performance and to reduce maintenance costs associated with splice and rail clamp details. Rail lengths...

 

 

 

 

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