本研究試擬透過柱之反覆載重試驗，以探討低矮建築受鋼筋腐蝕效應對柱構件之耐震行為影響。鋼筋腐蝕之方法採外加電流之電化學腐蝕方式， 腐蝕區域為自柱基礎頂部起算至柱身其上 55 公分範圍內之塑鉸區，本試 驗凡 7 組全尺寸與 4 組縮尺寸之柱試體，全尺寸試體含三組不同之重量損失率分別為 0%、10%、20%，縮尺寸試體則為 10%、20%。全尺寸試體每 組亦皆測試以兩種不同軸力大小分別為 10%、20%並施行反覆載重，另外 縮尺寸試體則作為腐蝕量測之用。

本研究沿襲先前試驗之韋昀孜腐蝕鋼筋混凝土柱試體，綜合各試驗之結果顯示，所有鋼筋腐蝕率皆較標稱名義值為小，箍筋整體腐蝕率則全數超標，其可解釋為通電過程中電流轉移現象與互制行為。具腐蝕之試體其裂縫較集中於腐蝕區域且裂縫寬度較大；反之，未腐蝕之試體其裂縫則較為分散及均勻。另外未腐蝕試體之極限位移比約可達 11%之多，而腐蝕之 試體則約為 8%，腐蝕亦會造成試體於小位移比即達到最大側力，此造成 結構之降伏提前發生。

曲率方面，未腐蝕之各試體曲率較為接近，有腐蝕之試體其有較大之極限曲率值且皆位於柱底端附近。剪應變部分，高度腐蝕狀態會導致試體變形易於集中構件某部，則試體柱底有較大之剪應變極值，此外高軸力情況亦會有較大之剪應變值。位移貢獻方面，各試體之位移量主要為撓曲變形所控制，其次為鋼筋滑移影響，最後則為剪切變形。載重試驗之部分， 在施加 10% 軸力情形中試體主筋挫屈行為並不明顯，而 20%軸力作用下 主筋挫屈情形則較為顯著，此將導致試體強度急速下降。

This research explores the seismic performance of corroded reinforced concrete columns of low-rise buildings through cyclic loading test. An electrochemical method was used to accelerate the corrosion of the reinforced concrete columns at the locations within the plastic hinge range, which ranges from the top of foundation to the 55 cm height of reinforced
concrete columns. Experimental results together with our previous study were used to examine the seismic behavior of corroded reinforced concrete through cyclic loading test. The specimens with different corrosion levels (i.e., 0%, 10%, 20%) and different axial force load ratios (i.e., 10%, 20%) were investigated. Moreover, additional minimal-size specimens were used for the measurement of corrosion.

Test results showed that the corrosion rates of longitudinal reinforcing steel bars were lower than the nominal value, while the corrosion rates of transverse stirrups exceeded the nominal value. These results could be attributed to current transfer phenomena and interaction system behavior during energization process. It was observed that the crack width of the corroded specimens were larger than that of the uncorroded specimens. Moreover, it could be found that the cracks were prone to occurr in corroded region. The ultimate drift ratio of the corroded specimens and the uncorroded specimens were 8% and 11%, respectively. The specimen might reach the maximum lateral force at small drift ratio due to corrosion, resulting in faster arrive of its yield load.


The obtained curvatures of the corroded specimens were larger than that of the uncorroded specimens. Moreover, the corroded specimens owned the maximum curvature value and larger shear strain value at the bottom of the column. The factors contributed to the displacement of the specimens were deflection, steel slipping and shear deformation in sequence. The buckling of the longitudinal bars could be observed obviously under 20% of axial force, which caused the sharp decline in the strength of the specimens.

目錄
摘要
ABSTRACT
致謝
表
圖目錄
VI 第一章 緒論
1.1 研究動機
1.2 研究背景
1.3 研究目的
第二章 文獻回顧
2.1 腐蝕機理
2.2 鋼筋腐蝕對保護層混凝土抗壓強度與韌性的影響
2.3 裂縫與鋼筋腐蝕之循環關係
2.4 通電腐蝕方法與腐蝕量預測
第三章 腐蝕柱實驗流程
3.1 腐蝕柱試體製作
3.2 柱試體設計方法與檢核
3.3 試體製作程序
3.4 柱試體材料強度試驗
3.5 柱試體通電加速腐蝕
3.6 腐蝕柱試體反覆載重試驗
第四章 試驗結果與分析
4.1 通電腐蝕觀測
4.2 腐蝕鋼筋觀測
4.3 試體腐蝕通電程序
4.4 試體破壞行為與裂縫觀察
4.5 遲滯迴圈
4.6 曲率、剪應變、滑移及位移貢獻
4.7 耐震性能分析
第五章 結論與建議
5.1 試驗與分析結論
5.2 相關建議
參考文獻
附錄 A 柱試體反覆載重試驗裂縫發展照
附錄 B 柱試體鋼筋腐蝕照
附錄 C 柱腐蝕試體表面裂縫照

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