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標題: | 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 Strength Prediction Model and Behavior of High Strength Steel Fiber Reinforced Concrete Walls with Opening |
作者: | 黃淳憶 Chun-Yi Huang |
指導教授: | 廖文正 Wen-Cheng Liao |
關鍵字: | 高性能混凝土,鋼纖維混凝土,開口剪力牆,軟化壓拉桿模型, High-performance concrete,steel fiber concrete,shear walls with opening,softened strut-and-tie model, |
出版年 : | 2022 |
學位: | 碩士 |
摘要: | 現今建築物為了滿足使用性設置許多的剪力牆版,許多具有門型或是窗型開孔。剪力牆在耐震能力上雖能提高整體結構之勁度,但同時是地震中震損較嚴重的構件。在台灣針對開孔剪力牆之震損調查中,觀察到破壞經常集中在開孔左右兩側之垂直牆段上,造成整體結構雖未崩塌,但民眾已無法信任其安全性而繼續居住。近年來,高強度混凝土漸漸被廣泛使用,但該材料雖具有良好的抗壓能力,其材料性質卻較為脆性,為了維持足夠的耐震能力,需在剪力牆這類不連續區域配置大量圍束鋼筋,而造成施工上綁紥鋼筋之不易。 添加鋼纖維於高強度混凝土之中能延緩脆性破壞,由於鋼纖維之間的橋接效應能有效抑制裂縫生成,因此能大幅減少橫向鋼筋以解決施工上的問題,也能消除現今開口剪力牆因裂縫造成的安全疑慮。根據本研究群歷年針對結構不連續區域的研究,包含梁柱接頭與深梁的結果顯示,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,因此本研究使用鋼纖維混凝土澆置剪力牆,欲釐清其力量傳遞行為與控制裂縫效益。 本研究執行四座高強度鋼纖維混凝土剪力牆實驗,以開孔之有無、開孔型式、牆體鋼筋比、邊界柱箍筋量與開孔補強筋配置作為試驗參數,欲透過試體強度變形行為和裂縫發展之觀察,得到開孔剪力牆極限剪力與撓曲強度並釐清鋼纖維與橫向鋼筋互相搭配之效益,修正預測模型並提供未來設計之參考。試驗結果顯示,添加鋼纖維能夠有效取代近五成的邊界構件箍筋量以及開孔補強筋,使牆體維持一定強度與變形能力,鋼纖維的橋接效應也使混凝土剝落面積大幅下降。本研究將鋼纖維所提供的拉力考慮進原開孔牆剪力強度預測模型,其結果較校舍手冊預測結果準確。 Reinforced concrete walls are commonly used in residential building. Due to functional purpose, opening of doors and windows are required for walls. Although the existance of shear walls can improve the stiffness of the structure in terms of seismic capacity, it is the component with serious seismic damage during earthquakes. In the earthquake damage investigation, it was observed that the damage was often concentrated on the vertical wall sections beside the opening, which leads to people distrust the safety of walls. High strength reinforced concrete has been utilized in modern high-rise buildings. Howerver, as the material has higher compressive strength, it become more brittle. In order to maintain certain ductility in high shear demanding area such as shear walls, lots of shear reinforcement are required in desing code, which leads to steel congestion and construction difficulties. Studies show that by adding steel fiber into concrete, brittle behavior can be improved and cracks can be restrained effectively because of the bridging action steel fiber provides across microcracks in the matrix, thereby adding steel fiber into concrete is able to replace certain amount of transverse reinforcement for better construction workability as well as eliminate the safety concerns caused by cracks in shear walls with opening. Based on research results conducted on discontinuity regions such as deep beams and beam-column joints, using steel fiber reinforced concrete (SFRC) can promote toughness and shear strength of the components, replacing huge amount of transverse reinforcement. While the benefits of using SFRC in structural discontinuities are known, its force transmission mechanism in shear walls remains to be clarified. In this study, four SFRC walls specimens were carried out to investigate the effect of the types of opening, the ratio of web shear reinforcement, the amount of stirrups in the boundary elements and the strengthening reinforcement of opening. By observing the crack development within the specimen, as well as the strength and deformation behavior, it is concluded that the adding of steel fibers can effectively replace half amount of stirrups in the boundary element and strengthening reinforcement of opening. A model is also proposed to include the tensile strength provided by the steel fiber in the horizontal tensile capavities for equilibrium, which determine a more reasonable height of shear element. The shear strength result are also more accurate than predicted strength by TEASPA. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/85156 |
DOI: | 10.6342/NTU202202079 |
全文授權: | 同意授權(限校園內公開) |
電子全文公開日期: | 2024-08-10 |
顯示於系所單位: | 土木工程學系 |
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