| Summary: | 碩士 === 國立成功大學 === 土木工程學系 === 88 === In practice, the vertical alignment and number of lanes of a highway segment are designed separately, with vertical alignment determined coming first in most cases. The design process is very complicated and vast amounts of computations involved. As such, while it is diserable to obtain an optimal design, a feasible solution, which is itself hard to develop, is often used.
In this research we analyze the highway design process and discuss the relationship between stages in the process. We propose models to solve for vertical alignment while considering highway capacity simultaneously. Specifically, we develop four models, all are aimed at solving an optimal number of lanes and the vertical alignment simultaneously. The models are mixed integer programming problems. Major factors considered are construction cost, earthwork cost, design criteria, Highway Capacity Manual requirements, and heavy vehicle climbing speed . The models comply with design requirements and solve for optimal tradeoffs between vertical alignment and highway capacity. The models can be solved using the Threshold Accepting heuristic. Two numerical examples of 800m and 10Km in length are presented.
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