高強度鋼筋混凝土單柱式橋墩耐震行為之研究

本研究採用高強度混凝土與高強度鋼筋（New RC），目標為檢討斷面、材料與配筋組合，使高強度橋柱試體，在相同軸力下獲致與一般強度橋柱相同之撓曲強度及位移韌性。一般強度及高強度試體分別採用60及50 cm方形斷面，混凝土、縱向主筋、與橫向鋼筋之設計強度依序為27.5、412.0、274.7 MPa及68.7、686.7、784.8 MPa。實驗變數包括橫向鋼筋間距及軸力。實驗結果顯示，在低軸力條件下採用New RC可大幅減少斷面尺寸與材料用量，無需變更鋼筋施工細節，且結構行為滿足耐震設計規範規定。此外，結構分析可有效預測New RC橋墩之結構行為，未來可適用於大跨度新建橋梁及既有橋梁拓寬工程。

關鍵字

高強度鋼筋混凝土；橋墩；耐震能力

並列摘要

This study presents the experimental study on the seismic performance of bridge column with high strength concrete and reinforcements, called New RC column. Given a specified plastic moment strength resulted from a predetermined RC column with ordinary materials, the design objective of New RC column is to provide same plastic moment strength but reducing the cross section, quantities of longitudinal and lateral reinforcement simultaneously. Total of one RC and five New RC square columns were carried out by cyclical loading tests. For New RC specimens, the design compressive strength of concrete, yielding strength of longitudinal and lateral reinforcement are 68.7, 686.7, and 784.8 MPa, respectively, while RC column are 27.5, 412.0, and 274.7 MPa. Experimental results demonstrated that New RC column can reduce cross section up to 30%, eliminate 25% number of longitudinal bars, and 20% of the lateral reinforcement without changing its flexural-dominate failure mode. In addition, the pushover curve can be well predicted by the proposed program. It is because of enhanced shear capacity and low axial load ratio that New RC is superior to RC bridge column and its application can be expected in the future.

並列關鍵字

new RC ； bridge pier ； seismic performance

國際替代計量

高強度鋼筋混凝土單柱式橋墩耐震行為之研究

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