混凝土單樁側向承力行為之有限元素模擬

Finite Element Simulation for Lateral Load-carrying Behavior of Concrete Single-piling

周庭宏(Ting-Hung Chou)

指導教授 ： 鄭全桓

國立暨南國際大學/科技學院/土木工程學系/碩士(2012年)

摘要

前人文獻，研究碼頭棧橋腐蝕及碳纖(CFRP)補強修復預力混凝土（PC）基樁的耐震性能，執行七個模擬腐蝕及CFRP補強PC樁縮尺試體之反覆側向載重試驗。本論文應用力法式纖維元素（FFE）模式和OpenSees軟體分析前人研究的七個PC基樁試體試驗，其分析結果與試驗結果相當吻合。由於這類基樁的腐蝕為水平不對稱，因此本研究也將FFE模式加以延伸，應用於PC樁試體的各水平方向耐震能力分析。基於有限元素分析結果和實驗觀察，本研究並為腐蝕PC樁之CFRP包覆修復，提供設計準則建議。並且，為驗證是否可應用於模擬整體基樁-土層系統(pile-soil system)，本文並使用FFE結合非線性土壤彈簧，建立一基樁-土層系統之整體有限元素模式，分析一全尺寸基樁現地側向載重試驗，得到相當準確的分析結果。

關鍵字

有限元素 ； 纖維元素 ； 力法式 ； 樑柱元素 ； 預力混凝土基樁 ； 修復 ； CFRP護套 ； 反覆 ； 基樁-土層系統

並列摘要

Seven reduced-scale prestressed concrete (PC) pile specimens for landing stages simulating four levels of corrosion were tested to investigate their cyclic lateral load-carrying behavior. Three corroded specimens were repaired using FRP jacketing before testing. In this paper, the force-based fiber element (FFE) and the OpenSees software are employed to analyze the seven PC pile specimens, achieving good corroboration with tests. Because the corrosion in such piles is horizontally asymmetric, the validated FFE models are used to execute 78 pushover analyses along various lateral directions to determine the multi-directional lateral strengths of the six corroded specimens. Based on the FFE analyses and experimental observations, this study makes design recommendations for FRP jacketing for use in repairing corroded landing stage PC piles. The FFE modeling is also extended to simulate the entire pile-soil system of an in-situ pile lateral load test, validating its feasibility and accuracy for an entire full-size pile-soil system.

並列關鍵字

Finite element ； fiber element ； force-based ； beam-column element ； PC pile ； corrosion ； repair ； FRP jacketing ； cyclic ； pile-soil system

參考文獻

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