高強度高流動性應變硬化鋼纖維混凝土單柱式橋墩耐震行為實驗與預測之研究

本研究採用高強度高流動性應變硬化鋼纖維混凝土，進行單柱式橋墩耐震行為之研究，檢討材料、斷面與配筋方式之組合，以及塑鉸區以鋼纖維取代橫向鋼筋之可行性。實驗試體計有5 組，包含一般強度混凝土／無鋼纖維1 組 (RC10T)，高強度混凝土／無鋼纖維2組 (NEWRC10T 、NEWRC20T)，高強度混凝土／含鋼纖維2 組 (NEWRCSF10 、NEWRCSF20T)。高強度混凝土、主筋、箍筋之設計強度分別為70、685、785 MPa；箍筋間距為10、20 cm；鋼纖維之拉力強度、長徑比與體積比分別為2300 MPa、79、1.5%。實驗結果顯示，採用高強度混凝土後使軸壓應力比降低，橋柱受力狀態近似於梁構件，均勻分佈之鋼纖維可提供適當的側向圍束力，並提昇混凝土剪力強度，達到取代橫向鋼筋的效果。鋼纖維橋柱之側向剪力強度與無鋼纖維者柱相近，呈現撓曲破壞模式，且層間位移角可達10%，並對裂縫寬度與發展有顯著抑制效果。此外，本研究採用簡化分析進行側推分析，比對實驗結果呈現良好趨勢，可達到快速評估強度與變形能力之目的。

關鍵字

高強度鋼筋混凝土；鋼纖維；橋墩；耐震能力

並列摘要

This paper presents the feasibility study of bridge column using high strength, flowability, strain hardening steel fiber-reinforced concrete, to investigate the seismic performance, especially for the combination of material, cross section, and reinfocement arrangement, as well as the replacing of reinforcement by steel fiber. Total of five specimens were carried out from cyclical loading tests, including specimen RC10T, NEWRC10T, NEWRC20T, NEWRCSF10, and NEWRCSF20T. The specified compressive strength of concrete, yielding strength of longitudinal and lateral reinforcement is 70, 685, and 785 MPa, respectively. The tensile strength, slender ratio, and volumetric ratio of steel fiber is 2300 MPa, 79, and 1.5%. Experimental results demonstrated given a relative low axial loading, the column either with insufficient lateral confinement or with insufficient shear capacity could be recovered by supplemental steel fibers, providing flexural-failure mechanism and achieving drift ratio of 10%. In addition, this seismic performance has been verified with good accuracy by the proposed concept of equivalent lateral reinforcement by using TEASPA.

並列關鍵字

New RC ； steel fiber ； bridge pier ； seiemic performance

國際替代計量

高強度高流動性應變硬化鋼纖維混凝土單柱式橋墩耐震行為實驗與預測之研究

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