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Student Number 88322049
Author Ming-Hsien Wu(吳明賢)
Author's Email Address No Public.
Statistics This thesis had been viewed 1840 times. Download 1300 times.
Department Civil Engineering
Year 2000
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Minimun Cost Design of Pile Groups Using the Genetic Algorithms
Date of Defense 2001-07-16
Page Count 82
Keyword
  • Genetic Algorithm
  • Minimum Cost De
  • Piles Groups
  • Abstract Conventional design of pile groups is based on the trial-and-error procedures. Although the design results can satisfy strength and displacement requirements that stipulated in code provisions, it is not a minimum cost design. The purpose of this study is to apply the genetic algorithm (GA) for searching the minimum cost design of precast concrete pile groups.
    The objective function of the problem includes the costs of soil excavation, cap and piles. The design variables are the pile diameter, pile length, spacing of piles, and dimensions of cap, which are all considered as discrete design variables. The size of precast concrete piles and rebars in the pile cap are all selected from the available sections in the engineering market.
    The strengths and displacement constraints for the minimum cost design of precast concrete pile groups are formulated according to the foundation design code provisions. Size constrains, such as the length of piles, the diameter of piles, and spacing of piles are also considered in the formulation.
    The application of GA in the minimum cost design of pile groups is shown by a number of design examples. The efficiency of GA and sensitivity analyses of design variables on the cost of pile groups are also discussed.
    Table of Content 中文摘要………………………………………………………………………………i
    英文摘要…………………………………………………………………………….ii
    目錄…………………………………………………………………………………iii
    表目錄…………………………………………………………………………………v
    圖目錄……………………………………………………………………………….vi
    第一章 緒論…………………………………………………………………………1
    1-1 研究動機…………………………………………………...……………..1
    1-2 文獻回顧………………………………………………………….…………2
    1-3 論文內容………………………………………………………...…………5
    第二章 理論推導……………………………………………………………………7
    2-1 遺傳演算法論……………………………………………………………….7
    2-1-1 遺傳演算法…………………………………………………………….8
    2-1-2 遺傳演算法的理論基礎………………………………………………11
    2-1-3 運算子運用的注意事項………………………………………………13
    2-2 解決束制條件的方法………………………………………………………16
    第三章目標函數和束制條件的建立…………………………………………….18
    3-1 前言…………………………………………………………………………18
    3-2 目標函數的建立……………………………………………………………18
    3-2-1 土方開挖費用…………………………………………………………19
    3-2-2 樁帽的費用……………………………………………………………20
    3-2-3 基樁打設費用…………………………………………………………21
    3-3 束制條件的建立……………………………………………………………21
    3-3-1 基樁的間距……………………………………………………………22
    3-3-2 樁頂位移量……………………………………………………………23
    3-3-3 基樁承載力……………………………………………………………25
    3-3-4 拉拔力檢核……………………………………………………………26
    3-3-5 穿孔剪力檢核…………………………………………………………27
    3-3-6 選用基樁強度…………………………………………………………28
    3-3-7 土地的限制…………………………………………………………..29
    第四章 參數討論………………………………………………………………….30
    4-1 前言…………………………………………………….………………….30
    4-2 遺傳演算法及計算效率之參數討論………………………………………31
    4-2-1 精英選擇法的影響…………………………………………………..31
    4-2-2 交配機率及突變機率的影響…………………………………………32
    4-2-3 族群數目的影響………………………………………………………32
    4-2-4 懲罰函數的影響………………………………………………………33
    4-3 群樁基礎之參數研究………………………………………………………34
    4-3-1 外力作用在打擊式群樁的效應………………………………………35
    4-3-2 鑽掘式群樁與打擊式群樁的比較……………………………………37
    4-3-3 土壤參數的影響………………………………………………………38
    4-3-4 兩向使用不同間距和使用相同間距之比較…………………………39
    4-3-5 基樁邊界長度之比較…………………………………………………40
    4-3-6固定樁數的討論……………………………………………………..40
    4-3-7經濟性的驗證…………………………………………………………41
    第五章 結論與建議…………………………………………………………….….42
    5-1 結論………………………………………………………………………...42
    5-2 建議………………………………………………………………………...43
    參考文獻……………………………………………………………………………..45
    附錄一 樁帽鋼筋計算流程………………………………………………………..83
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    Advisor
  • Der-Shin Juang(莊德興)
  • Files
  • 88322049.pdf
  • approve immediately
    Date of Submission 2001-07-16

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