本文選題：BFRP筋　切入點：短切玄武巖纖維　出處：《西南科技大學》2017年碩士論文

【摘要】：BFRP(玄武巖纖維)筋是可以代替鋼筋的一種新型抗腐蝕筋材,本文對已有的BFRP筋混凝土結構的文獻調研發(fā)現(xiàn),該結構在受彎時表現(xiàn)出撓度和裂縫較大的特點,且在文獻調研中發(fā)現(xiàn)普通鋼筋混凝土結構中摻入短切玄武巖纖維可以有效的改善混凝土的韌性和抗裂性能。因此,本文提出在BFRP筋混凝土結構中也摻入短切玄武巖纖維,以期能改善其原本較大的裂縫和撓度。根據(jù)文獻調研的結果結合實際條件,本文重點研究了短切玄武巖纖維摻量和縱向BFRP筋配筋率對BFRP筋纖維混凝土梁抗彎性能的影響,對該種新型結構在實際工程中的應用有重要作用。本文主要工作可闡述為以下4個方面:(1)通過標準材性試驗,得到了試驗所用BFRP筋和纖維混凝土的基本力學性能,為BFRP筋纖維混凝土梁構件的抗彎性能分析提供數(shù)據(jù)支撐。(2)通過6種工況下的BFRP筋纖維混凝土梁抗彎試驗后,得出了各試驗梁的抗彎試驗裂縫、撓度、承載力和破壞形式等試驗現(xiàn)象。并結合試驗現(xiàn)象對試驗結果進行了分析,得出了 BFRP筋應變隨荷載變化的規(guī)律,驗證了該結構基本滿足平截面假定。(3)通過分析不同玄武巖纖維摻量下BFRP筋纖維混凝土梁的抗彎性能。得出摻入短切玄武巖纖維后可有效提高BFRP筋纖維混凝土梁的開裂荷載,其提升的效果隨纖維摻量的增加先增大后減小,本試驗的各工況下,在短切玄武巖纖維摻量為0.4%時,開裂荷載提升幅度最大,達到60%。且摻入短切玄武巖纖維可有效延緩最大裂縫的開展,使得BFRP筋纖維混凝土梁的裂縫發(fā)展更為平均。(4)通過分析不同配筋率下的BFRP筋纖維混凝土梁的抗彎性能。得出BFRP筋梁的開裂荷載隨配筋率變化不大;但BFRP筋梁的極限荷載隨配筋率的減小而減小,且減小的幅度呈線性變化。BFRP筋梁的撓度隨配筋率的增大而減小,但減小的幅度存在明顯差異,當配筋率較小時,撓度隨筋配筋率的增大減小幅度并不明顯,平均在10%左右;當配筋率較大時,撓度隨配筋率的增大減小幅度較大,平均在43%左右。
[Abstract]:BFRP (basalt fiber) reinforcement is a new type of corrosion-resistant steel bar which can replace steel bar. In this paper, it is found that the existing BFRP reinforced concrete structure shows the characteristics of large deflection and crack when it is subjected to bending.And in the literature investigation, it is found that adding short cut basalt fiber into the common reinforced concrete structure can effectively improve the toughness and crack resistance of concrete.Therefore, in this paper, the short cut basalt fiber is added to the concrete structure of BFRP bar in order to improve the original crack and deflection.Based on the results of literature investigation and practical conditions, the effects of the content of short cut basalt fiber and the ratio of longitudinal BFRP reinforcement on the flexural behavior of BFRP reinforced concrete beams are studied in this paper.It plays an important role in the application of the new structure in practical engineering.The main work of this paper can be described as follows: (1) the basic mechanical properties of BFRP tendons and fiber reinforced concrete used in the test are obtained through the standard material test.This paper provides data support for the analysis of flexural behavior of BFRP reinforced fiber reinforced concrete beams. After the flexural tests of BFRP reinforced fiber reinforced concrete beams under six conditions, the bending test cracks and deflections of each test beam are obtained.Test phenomena such as bearing capacity and failure form.Combined with the experimental phenomenon, the experimental results are analyzed, and the law of strain variation of BFRP bars with load is obtained.It is verified that the structure basically meets the assumption of plane section. The flexural behavior of BFRP reinforced fiber reinforced concrete beams with different basalt fiber content is analyzed.It is concluded that the crack load of BFRP reinforced concrete beams can be effectively increased by adding short cut basalt fibers, and the lifting effect increases first and then decreases with the increase of fiber content. In each working condition of this experiment, when the content of short cut basalt fibers is 0.4,The range of cracking load lifting is the largest, reaching 60%.Adding short cut basalt fiber can delay the development of maximum crack and make the crack development of BFRP reinforced concrete beam more average. 4) the flexural behavior of BFRP reinforced concrete beam with different reinforcement ratio is analyzed.It is concluded that the crack load of BFRP reinforced beam varies little with the reinforcement ratio, but the ultimate load of BFRP beam decreases with the decrease of reinforcement ratio, and the amplitude of the decrease is linear. The deflection of BFRP-reinforced beam decreases with the increase of reinforcement ratio.The average is about 43%.
【學位授予單位】：西南科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU37

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本文編號：1725981