無腹筋高強度鋼纖維鋼筋混凝土梁撓曲與剪力強度之評估

Evaluation of Flexural and Shear Capacity of High Strength Steel Fiber-Reinforced Concrete Beams without Stirrups

吳勇福(Yung-Fu Wu)

指導教授 ： 廖文正

國立臺灣大學/工學院/土木工程學研究所/碩士(2014年)

https://doi.org/10.6342/NTU.2014.01991

摘要

許多研究均指出在混凝土中添加鋼纖維，具有有效提高混凝土抗拉強度、提高彈性模數、發展韌性行為以及改善破壞機制等效果。並在ACI-318-08中已經允許在特定情況下，鋼纖維可取代傳統剪力鋼筋的配置，代表加入鋼纖維對於剪力強度的貢獻已經被認可。
鋼纖維雖具有以上優點，但目前仍很少並被使用在實務方面，主要原因是目前仍缺少的相關設計公式，因此為了使鋼纖維混凝土能夠更普遍的應用在實務上，需要量化鋼纖維混凝土所產生的效益，以加速相關規範之訂定。本研究主要探討評估鋼纖維混凝土梁撓曲與剪力強度的評估，透過實驗結果，調整目前純混凝土計算撓曲強度的參數，用以上調整，推導出較能符合力學行為的新剪力預測公式，再以眾多文獻中蒐集而來的數據加以應證其精確性及適用範圍。

關鍵字

鋼纖維混凝土 ； 彎鉤型鋼纖維 ； 撓曲強度 ； 剪力強度

並列摘要

A number of studies pointed out that adding steel fiber to concrete will enhance tensile strength and elastic modulus, develop ductile behavior, and improve failure mechanism. As stated in ACI-318-08, steel fiber is allowed to replace traditional stirrups under certain circumstances. Its contribution for increasing shear strength has been well-recognized.
Despite of having these advantages, steel fiber is not commonly used in practice due to the lack of design formula. In order to increase the prevalence of steel fiber concrete, quantifying the benefits of it is critical for accelerating the development of relevant regulations. The focus of this study is to evaluate the flexure strength of steel fiber concrete and shear strength. By adjusting the parameter of pure concrete base on the experimental results, the prediction formula of new shear strength that applies the principle of mechanic is generated. The data that were collected from various credible sources once again confirmed its accuracy and the range of its application.

並列關鍵字

steel fiber reinforced concrete ； hooked fiber ； flexure strength ； shear strength.

參考文獻

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[1] ACI Committee 318 (2008). Building Code Requirements for Structural Concrete and Commentary, American Concrete Institute, Farmington Hills, MI, 465.

[2] 高唯淵，「高流動性應變硬化鋼纖維混凝土之配比設計與力學行為研究」，碩士論文，國立台灣大學土木工程學研究所，民國101年。

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[4] Wafa, F. F., and Ashour, S. A. (1992). "Mechanical Properties of High-strength Fiber Reinforced Concrete." ACI Materials Journal, 89(5), 449-455.