高強度鋼筋混凝土構架式橋墩耐震行為實驗與預測之研究

本研究採用高強度混凝土與高強度鋼筋材料（New RC），目標為檢討斷面、材料與配筋組合，使高強度鋼筋混凝土構架式橋墩，在相同柱軸力下可獲致與一般強度橋柱相近之撓曲強度及位移韌性。實驗內容包含2座雙柱構架式橋墩之反覆側推實驗。試體淨高與跨度均為4 m，一般強度試體（RCF）及高強度試體（NEWRCF），分別採用60 cm及50 cm正方形斷面，其混凝土、縱向主筋、與橫向鋼筋之實測強度依序為42、520、335 MPa及80、723、833 MPa，縱向鋼筋比及橫向鋼筋體積比則皆為2.3%及2.4%。實驗結果顯示，低軸力比條件採用New RC可減少斷面尺寸與材料用量，結構行為滿足公路橋梁耐震設計規範有關強度與韌性規定且無需變更施工細節，另結構分析證實可有效預測New RC之撓曲與剪力行為，提供未來規範修訂鋼筋材質與結構系統韌性容量之參考。

關鍵字

高強度鋼筋混凝土；構架式橋墩；耐震性能；結構損傷

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. The design objective of New RC multicolumn bent is to provide same plastic moment as convention RC bridge but reducing the cross section, quantities of both longitudinal and lateral reinforcements simultaneously. Specimens RCF and NEWRCF were 4 m in center-to-center span length and 4 m in clear height. The detected compressive strength of concrete, yielding strength of longitudinal and lateral reinforcement was 80, 723, and 833 MPa for NEWRCF, respectively, while RCF were 42, 521, and 335 MPa. Experimental results demonstrated both RCF and NEWRCF satisfied the design target of moment strength, and regulations of displacement ductility in Seismic Design Specification of Highway Bridge. In addition, the pushover curves obtained by the proposed program were agreed with experimental results. Experimental results were recommended to revise the requirements of material properties of steel and lower bound of the structural ductility for multicolumn bent system.

並列關鍵字

New RC ； multicolumn bent ； seismic performance ； structural damage

國際替代計量

高強度鋼筋混凝土構架式橋墩耐震行為實驗與預測之研究

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