交流道平面近似線形最佳化模式

• Main Author: 孫沁芬
• Other Authors: 李宇欣
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/51187917928872239662

碩士 === 國立成功大學 === 土木工程學系 === 89 === The process of highway geometric design is complicated, requires enormous computing work, and is labor, time, and cost consuming. This is especially true for the ramps of an interchange. In additional to code requirements on individual alignments, many complicated restrictions apply as multiple ramps share a common 3-dimensional space. In this research we analyze the geometric relationships and constraints between the ramps for various interchange types. Mathematical methods are then used to develop a model to describe the horizontal alignment of an interchange. Line segments are used as a surrogate for curves. The goal is to minimize any weighted combination of the land used, amount of construction, and total length of ramps. Constraints considered include code requirements, appearance, and the connection or overpassing between ramps. A code written in C language that utilizes the Threshold Accepting Heuristic is developed to solve the model. Five numerical examples are provided in the thesis to demonstrate the model under different parameters as well as different considerations. Testing results indicate that the model can correctively solve for an approximate alignment for interchanges, and the output can be used as a first draft for highway engineers.