高強度鋼纖維混凝土開口剪力牆預測模型與行為研究

The Study on Prediction of Lateral Load Displacement Force and Behavior of High Strength Steel Fiber Reinforced Concrete Walls with Opening

10.6849/SE.202309_38(3).0003

黃淳憶(Chun-Yi Huang)；何奕親(Yi-Ching Ho)；(Binh Nguyen Doan)；廖文正(Wen-Cheng Liao )

New RC ； 開孔剪力牆 ； 鋼纖維混凝土 ； 垂直牆段 ； 不連續區 ； New RC ； Shear wall with opening ； Steel fiber reinforced concrete ； Vertical wall segment ； Discontinuous zones

結構工程

38卷3期（2023 / 09 / 01）

56 - 84

繁體中文;英文

隨著高層建築的需求逐漸提升，為縮減構件尺寸以降低結構體的自重並有效率地提高可使用空間，各國已發展出高強度混凝土，在台灣的New RC計畫也開始推廣高強度材料的使用，其主要針對混凝土抗壓強度（_C^′）70MPa以上、鋼筋降伏強度（_y）685MPa以上之營建材料進行研究。然而，隨著混凝土材料強度之提升，其性質將逐漸轉為脆性，因此依照現今之規範需要在應力干擾區或斷面幾何不連續區（D區）如梁柱接頭等，配置大量之剪力箍筋來維持件之韌性及剪力強度，但密集的剪力箍筋將導致施工上綁紮困難、灌漿時混凝土工作性不佳而使混凝土構件品質降低。而添加鋼纖維於高強度混凝土之中能大幅增加剪力強度、延緩脆性破壞，由於鋼纖維之間的橋接效應能有效抑制裂縫寬度擴張，因此能大幅減少橫向箍筋的配置，解決施工上的問題。根據過去針對結構不連續區（D區），如梁柱接頭與深梁等等進行試驗，結果顯示使用鋼纖維於高強度混凝土中可提高構件韌性與抗剪強度，因此已知使用鋼纖維混凝土於結構不連續區的效益。本研究針對同為結構不連續區域之構件的剪力牆，將執行4座高強度鋼纖維混凝土剪力牆實驗作探討，試驗參數包含開孔之有無、開孔型式、牆體鋼筋比、邊界柱箍筋量與開孔補強筋配置，欲透過試體強度變形行為和裂縫發展之觀察，釐清鋼纖維扮演的角色及其與橫向鋼筋互相搭配的效益，以修正預測模型並提供未來設計之參考。

With the gradual increase in the demand for high-rise buildings, countries all over the world have developed high-strength concrete in order to reduce the size of components to reduce the weight of the structure and increase the usable space efficiently. The New RC project in Taiwan has also begun to promote the use of high-strength materials. It mainly conducts research on construction materials with concrete compressive strength (_C^') above 70MPa and steel yield strength (_y) above 685MPa. However, as the compressive strength of the concrete material increases, its properties will gradually become brittle. Therefore, according to the current code, it is necessary to deploy a large amount of shear reinforcements in the stress interference area or the geometric discontinuity zone (D zone) such as beam-column joints. Stirrups are used to maintain the toughness and shear strength of the parts, but dense shear stirrups cause difficulties in reinforcement assembling during construction, and poor workability of concrete during casting, which results in the poor quality of concrete components. Adding steel fibers to high-strength concrete can delay brittle failure. Since the bridging effect between steel fibers can effectively inhibit the expansion of crack width, it can greatly reduce the configuration of transverse stirrups and solve construction problems. According to the past experiments on the structural discontinuity area (D area), such as beam-column joints and deep beams, etc., the results show that the use of steel fibers in high-strength concrete can improve the toughness and shear strength of components, so the benefits of steel fiber reinforced concrete in structural discontinuities is known. This study carried out 4 high-strength steel fiber reinforced concrete shear wall experiments as the shear walls that are also members of the structural discontinuity area. The test parameters include the presence or absence of openings, the type of openings, the ratio of steel bars in the wall, the amount of stirrups in the boundary columns, and the configuration of reinforcement bars in the openings. Through the observation of the strength and deformation behavior of the test body and the development of cracks, the role played by steel fibers and the benefits of collocation with transverse reinforcement will be clarified in order to revise the prediction model and provide reference for future design.

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