橫縱向鋼筋增加機械式固定對鋼筋混凝土柱之耐震行為實驗研究

在現今鋼筋混凝土結構物的施工過程中，縱向主筋與橫向箍筋或繫筋接合的地方僅利用鐵絲捆綁使其暫時固定，以利灌漿時各部位鋼筋的位置不致於錯動。但是這樣並非可靠且有效的固定方式，因為當鋼筋混凝土構件在抵抗外力的過程中，縱向主筋與繫筋及橫向箍筋所組成的網格會因構件的受損而逐漸變形，如此橫向箍筋便無法維持應有的圍束效應。一但構件嚴重受損時，由於柱體內核心混凝土間的相互擠壓而造成網格的嚴重變形，極可能導致破碎的核心混凝土在網格擴大的區域向外崩落，相信此為導致明顯的遲滯迴圈收縮現象產生之原因。研究內容蒐集與規劃包括共三座1:2.5的縮尺鋼筋混凝土橋柱試體與五座全尺寸鋼筋混凝土校舍柱體在國家地震工程研究中心(NCREE)進行的反覆載重試驗資料，探討在柱塑性鉸區域內縱向主筋與橫向箍筋交接處使用機械式固定的方式，包括鋼纜線纏繞與馬蹄形金屬釦件。從不同觀點出發，分析比較各試體的試驗結果以了解鋼纜線以及金屬扣件在對矩形柱體性能提昇的影響與差異。

關鍵字

鋼筋混凝土柱；反覆載重試驗；機械式固定

並列摘要

During the constructional process of reinforced concrete structures nowadays, only steel wires are used to temporarily fasten the intersection of longitudinal rebar and ties or stirrups to fix the position of steel during the pour. However, this isn’t a reliable and effective way because when receiving loads the rebar grids formed by longitudinal rebar and ties or stirrups would gradually become deformed due to the damage. Once the column element was severely damaged, the core concrete would squeeze the rebar and then fall out the rebar cage. It is believed that which is not only the cause to the degradation of strength and stiffness but also the reason of sensible pitching of hysteretic loops for reinforced concrete columns. In this experimental study, three bridge columns scaled down to 1:2.5 and five full-scale school columns are tested in NCREE. The main purpose of this study is to evaluate the seismic resistance of bridge and school columns using mechanical fastening in plastic hinge zones. The mechanical fastening includes: structural wire ropes and U-typed screws. Through cyclic loading tests, the differences in seismic behavior of the eight column specimens are investigated, and the performance is compared in terms of stiffness, strength, ductility and energy dissipation.

並列關鍵字

reinforced concrete column ； cyclic loading test ； mechanical fastening

參考文獻

[1]Bae, Sungjin and Bayrak, Oguzhan, ”Plastic Hinge Length of Reinforced Concrete Columns,” ACI Structural Journal, Vol. 105,Issue 3, 2008, pp.290-300.

[2]Chang, S.Y. and Tsai I.C., “Experimental Study of As-Built and Composite Materials Retrofitted Reinforced Concrete Columns,” Canadian Journal of Civil Engineering, Vol. 32 ,No.2, pp.454-460, 2005 (NSC-91-2711-3-319-200).

[3]Nawy, Edward G., Reinforced Concrete : A Foundamental Approach, Upper Saddle River, New Jersey, Person Education, Inc., 2005, pp.312-315

[12]陳志峰，「利用能量耗散觀念評估鋼筋混凝土柱之韌性強度」，碩士論文，國立台北科技大學土木與防災研究所，2007。

[4]Park, R. and Paulay, T., “Reinforced Concrete Structures,” Johm Wiley and Sons, New York, 1975, pp.769

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橫縱向鋼筋增加機械式固定對鋼筋混凝土柱之耐震行為實驗研究

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