預鑄節塊施工法是一種常見的橋梁施工法，在台灣多見於箱型梁結構。本研究旨在探討高雄港聯外道路高架橋預鑄節塊墩柱之預力變化。本研究於預鑄墩柱節塊埋設應變計，同時製作混凝土圓柱試體進行材料試驗，藉此監測混凝土變形，並與規範預測式比較，評估預力損失量。
墩柱節塊之乾縮應變在澆鑄混凝土270天即已幾乎發展完全，其值在260×10^(-6)左右。將墩柱節塊與圓柱試體潛變試驗之相關參數代入ACI-209潛變預測式，兩者有一比例關係(ξ)，圓柱試體之潛變係數值乘上ξ後與墩柱節塊之潛變應變發展相當接近，表示可由潛變架試驗結果推估得到墩柱之潛變應變行為。
根據墩柱混凝土應變實測值與理論預測式進行長期預力損失評估，於施預力後50年，P13～P15墩柱的有效預力為13,420 kg⁄cm^2 ，為起始預力的93.5%；P16墩柱的有效預力為13,639 kg⁄cm^2 ，為起始預力的95.1%，均大於設計值的10,000 kg⁄cm^2 。

Precast segmental construction method is often used in bridge construction, but it’s more common in the box girder in Taiwan. This thesis aims at studying the prestress losses of segmental pier columns in the viaduct connecting Kaohsiung Harbor and First Freeway. In experimental study, the monitoring of concrete strain variations in pier segments and the material tests of concrete cylinder were conducted. The assessment of prestress losses was carried out based on the measured strains and design codes.
The measured shrinkage strain of segmental bridges piers was 260×10^(-6) after 270 days of casting and the rate of increase in strain was not pronounced. Using the related parameters for the prediction of creep strain by ACI-209 methods for the concrete cylinder specimen and the piers, a proportion ξ between them can be found. The creep strain of pier column can be predicted by multiplying ξ to that of concrete cylinder. Therefore, we can estimate the creep strain of pier column based on the creep test of concrete cylinder.
According to the currently measured concrete strain and prediction equation of the long-term prestress losses, the effective prestress of the piers, after 50 years of applied prestress, for P13~P15 is estimated as 13,420 kg⁄cm^2 , which is 93.5% of the initial prestress; while for the pier P16, the effective prestress is 13,639 kg⁄cm^2 , which is 95.1% of the initial prestress. The estimated effective prestress is greater than the design value of 10,000 kg⁄cm^2 .

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