【摘要】：我國沿海及鹽堿地區(qū)的鋼筋混凝土橋梁，不可避免的受到鹽、堿環(huán)境腐蝕，部分橋梁使用僅幾年便產(chǎn)生鋼筋銹蝕、混凝土脫落等現(xiàn)象，嚴(yán)重影響橋梁的承載能力和耐久性能。BFRP(玄武巖纖維布)作為一種新型無機(jī)材料，，具有質(zhì)量輕、強(qiáng)度高、耐疲勞和耐腐蝕等顯著優(yōu)點(diǎn)，在橋梁加固領(lǐng)域中有廣闊的應(yīng)用前景。本文通過試驗，綜合分析了堿環(huán)境、鹽環(huán)境對玄武巖纖維布加固混凝土梁整體耐久性能的影響，為橋梁結(jié)構(gòu)防腐、加固提供可靠的基礎(chǔ)數(shù)據(jù)和理論支持。 本文研究工作得到天津市自然科學(xué)基金重點(diǎn)項目（基金編號12JCZDJC28900）和天津市科技興海項目（基金編號KJXH2012-19）資助。主要進(jìn)行了以下的研究工作： 1、研究了鹽、堿環(huán)境條件下，玄武巖纖維布加固鋼筋混凝土梁撓度變化、裂縫形成和發(fā)展、荷載—應(yīng)變分布情況以及加固梁的破壞形態(tài)。試驗結(jié)果表明，玄武巖纖維布加固鋼筋混凝土梁可明顯減小梁跨中撓度，有效抑制裂縫的形成和發(fā)展，并得出工程應(yīng)用最優(yōu)加固層數(shù)。 2、通過控制玄武巖纖維布加固層數(shù)和鹽溶液濃度，研究鹽環(huán)境對玄武巖纖維布加固混凝土梁耐久性的影響。試驗研究結(jié)果表明，鹽環(huán)境對玄武巖纖維布加固混凝土梁的耐久性具有一定影響，加固梁承載力隨鹽溶液濃度增大而減小。 3、通過控制玄武巖纖維布加固層數(shù)和堿溶液PH值，研究堿環(huán)境對玄武巖纖維布加固混凝土梁耐久性的影響。試驗研究結(jié)果表明，堿環(huán)境對玄武巖纖維布加固鋼筋混凝土梁的耐久性有一定影響。
[Abstract]:Reinforced concrete bridges in coastal and saline-alkali areas of China are inevitably corroded by salt and alkali environment, and some bridges have been corroded by reinforcing bars and concrete falling off in only a few years. As a new inorganic material, BFRP (basalt fiber cloth), which seriously affects the bearing capacity and durability of bridges, has the advantages of light weight, high strength, fatigue resistance and corrosion resistance, and has a broad application prospect in the field of bridge strengthening. In this paper, the influence of alkali environment and salt environment on the durability of concrete beams strengthened by basalt fiber cloth is analyzed synthetically through experiments, which provides reliable basic data and theoretical support for the anticorrosion and strengthening of bridge structures. This paper is supported by the key projects of Tianjin Natural Science Foundation (Fund number 12JCZDJC28900) and Tianjin Science and Technology Xinghai Project (Fund number KJXH2012-19). The main research work is as follows: 1. The deflection change, crack formation and development of reinforced concrete beams strengthened with basalt fiber sheets under salt and alkali environment are studied. Load-strain distribution and failure pattern of strengthened beams. The experimental results show that reinforced concrete beams strengthened with basalt fiber sheets can significantly reduce the mid-span deflection of beams and effectively restrain the formation and development of cracks. By controlling the number of layers and the concentration of salt solution, the effect of salt environment on the durability of concrete beams strengthened by basalt fiber sheets is studied. The experimental results show that the salt environment has a certain effect on the durability of concrete beams strengthened by basalt fiber sheets. The bearing capacity of strengthened beams decreases with the increase of salt solution concentration. 3. By controlling the number of layers and the PH value of alkali solution, the effect of alkali environment on the durability of concrete beams strengthened by basalt fiber sheets is studied. The experimental results show that alkali environment has a certain effect on the durability of reinforced concrete beams strengthened with basalt fiber sheets.
【學(xué)位授予單位】：天津城建大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445.72

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