鋼筋混凝土剪力牆連接梁鋼筋配置之研究

Study on Detailings for Reinforced Concrete Coupling Beams of Shear Walls

張于軒(Yu-Hsuan Chang)

指導教授 ： 黃世建

國立臺灣大學/工學院/土木工程學研究所/碩士(2012年)

https://doi.org/10.6342/NTU.2012.01794

摘要

連接式剪力牆系統為優秀的耐震結構系統，常配置於高樓建築的核心部分作為抗側力系統。之前的研究發現配置對角向鋼筋的連接梁，擁有比傳統型式配筋具有更佳的結構行為。但是，對角向鋼筋與其它鋼筋容易發生衝突，導致施工困難。因此，兼具施工性與結構行為之混合型配筋梁是一個可能之解決方案，混合梁是以內層之對角向鋼筋垂直分量抵抗剪力，外層之縱向主筋與內層之斜向鋼筋水平分量抵抗撓曲。
為探討配筋形式與其他參數對連接梁之影響，本實驗設計了八座試體探討不同跨深比、對角鋼筋配置型式(對角式、混合梁、雙叉梁)、以及混凝土強度對連接梁行為之影響，同時也探討連接梁的力傳遞機制。
實驗結果顯示，混合型配筋之連接梁確實擁有良好的耐震行為與較佳之施工性。對角鋼筋與混凝土壓桿平行者，其對角壓力鋼筋之結構功能較為顯著，反之則否。故而跨深比較小之連接梁，其對角鋼筋較為有效。提升混凝土抗壓強度，可以提升連接梁之耐震能力。降低連接梁之主筋尺寸，其會造成壓力主筋之挫曲較早發生。

關鍵字

鋼筋混凝土剪力牆連接梁 ； 減量對角鋼筋 ； 混合梁 ； 雙曲率變形 ； 力傳遞機制

並列摘要

Ductile coupled shear wall is an efficient lateral-force-resisting system, which is usually placed at the service core of tall building. Previous research found that diagonal detailings are indispensable to develop the ductile behavior of coupling beams with small span-to-depth ratios. Construction of diagonally reinforeced coupling beams is very difficult due to the orientation of diagonal reinforcement. Thus, hybrid beam that contains both constructability and structural behavior is a possible solution. Hybrid beam resist shear force by the vertical components of inner diagonal bars, and flexure by the outer longitudinal bars and the horizontal components of inner diagonal bars.
Eight full-scale specimens were designed to study the behavior of coupling beam under different apect-ratios, reinforcement detailing (diagonal, hybrid, rhombic) and concrete strength. Simultaneously, the force-transferring mechanism of coupling beams was also investigated.
Test results indicate that the hybrid detailing is an effective solution to balance the requirement of structural behavior and constructability. The effect of diagonal reinforcement is most effective when its orientation is parallel to the axis of concrete compression strut. Therefore, diagonal reinforcement is more effective for the coupling beams with small span-to-depth ratios. It is also found that concrete strength is useful to enhance the seismic behavior of coupling beam. Coupling beams are prone to buckling when detailed using longitudinal or diagonal bars with smaller size.

並列關鍵字

reinforced concrete coupling beams ； reduced diagonal reinforcement ； hybrid beam ； double curvature ； force-transferring mechanism

參考文獻

[10] 鄭志宏，「鋼筋混凝土連接梁反覆載重測試之研究」，碩士論文，國立台灣大學土木工程系，台北，民國99年。

[8] 王亭惟，「鋼筋混凝土連接梁耐震鋼筋配置之研究」，碩士論文，國立台灣大學土木工程系，台北，民國100年。

[2] ACI 318, “Building Code Requirements for Structural Concrete (ACI 318-99) and Commentary (ACI 318R-99),” American Concrete Institute, Farmington Hills, Michigan, 1999, 391 pp.

[3] ACI 318, “Building Code Requirements for Structural Concrete (ACI 318-05) and Commentary (ACI 318R-05),” American Concrete Institute, Farmington Hills, Michigan, 2005, 432 pp.

[4] ACI 318, “Building Code Requirements for Structural Concrete (ACI 318-08) and Commentary (ACI 318R-08),” American Concrete Institute, Farmington Hills, Michigan, 2008, 465 pp.