本文關(guān)鍵詞： 鋼筋混凝土結(jié)構(gòu) 電化學(xué)加速銹蝕方法 非均勻銹蝕 粘結(jié)強(qiáng)度 臨界銹蝕深度 開裂模式 銹蝕產(chǎn)物分布　出處：《浙江大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：氯鹽侵蝕是導(dǎo)致鋼筋混凝土結(jié)構(gòu)服役性能劣化的重要原因�？紤]不同環(huán)境與荷載耦合作用對鋼筋混凝土銹脹開裂的重要影響,對準(zhǔn)確預(yù)測鋼筋混凝土結(jié)構(gòu)的服役壽命也具有十分重要的意義。該文以此為主線,重點(diǎn)研究了混凝土保護(hù)層銹脹開裂發(fā)展過程。主要研究工作如下： (1)采用外加電流加速銹蝕方法可以快速的模擬混凝土中鋼筋的銹蝕過程,但是不同銹蝕方法得到的結(jié)論存在很大區(qū)別。該文采用四種不同的外加電流加速銹蝕方法對荷載作用下混凝土中鋼筋的銹蝕過程進(jìn)行了模擬,并分析了銹蝕后鋼筋表面形態(tài)特征及銹蝕產(chǎn)物的形貌和成分。 (2)根據(jù)鋼筋的非均勻銹蝕特征,對銹蝕帶肋鋼筋與混凝土間的粘結(jié)性能進(jìn)行了研究。基于未銹蝕帶肋鋼筋粘結(jié)強(qiáng)度的微觀受力模型與均勻銹蝕帶肋鋼筋粘結(jié)性能模型,考慮鋼筋實(shí)際銹蝕為非均勻銹蝕,利用彈性力學(xué)方法建立了帶肋鋼筋粘結(jié)強(qiáng)度預(yù)測模型,推導(dǎo)出銹蝕帶肋鋼筋與混凝土間的極限粘結(jié)強(qiáng)度,對有無橫向約束的銹蝕鋼筋極限粘結(jié)強(qiáng)度進(jìn)行了分析,并且對混凝土開裂時(shí)刻鋼筋的臨界銹蝕深度進(jìn)行了預(yù)測。 (3)為提高混凝土結(jié)構(gòu)的服役性能,對混凝土保護(hù)層的銹脹開裂過程進(jìn)行了研究。通過對荷載作用下銹蝕18個(gè)月的內(nèi)摻氯鹽鋼筋混凝土梁的截面銹脹裂縫分析,考慮鋼筋混凝土受力狀態(tài)及骨料與裂縫的相對位置,對銹脹裂縫開裂模式及銹蝕產(chǎn)物分布情況進(jìn)行了研究。同時(shí)對混凝土保護(hù)層的破壞形式進(jìn)行了分析,提出銹蝕鋼筋混凝土梁設(shè)計(jì)建議,對鋼筋混凝土結(jié)構(gòu)的服役性能評估和修復(fù)具有重要意義 論文得到國家高技術(shù)研究發(fā)展計(jì)劃(863計(jì)劃)(2012AA050903),國家自然科學(xué)基金(51178413、51008272和50838008)與國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃)(2009CB623200)的資助。
[Abstract]:Chloride erosion is an important cause of deterioration of service performance of reinforced concrete structures. It is also of great significance to accurately predict the service life of reinforced concrete structures. This paper focuses on the development process of rust expansion cracking of concrete cover. The main research work is as follows:. 1) the corrosion process of steel bars in concrete can be quickly simulated by applying applied electric current to accelerate corrosion. However, the conclusions obtained by different corrosion methods are very different. In this paper, the corrosion process of steel bars in concrete under load is simulated by four different applied electric current accelerated corrosion methods. The surface morphology, morphology and composition of corroded steel bar were analyzed. 2) according to the inhomogeneous corrosion characteristics of steel bar, the bond behavior between corroded ribbed steel bar and concrete is studied. Based on the model of bond strength of non-corroded ribbed steel bar and uniform corroded ribbed steel bar, the bond behavior model of corroded ribbed steel bar is presented. Considering that the actual corrosion of steel bar is non-uniform corrosion, a prediction model of bond strength of ribbed steel bar is established by means of elastic mechanics method, and the ultimate bond strength between corroded ribbed steel bar and concrete is deduced. The ultimate bond strength of corroded steel bar with or without transverse constraints is analyzed and the critical corrosion depth of steel bar at cracking time is predicted. In order to improve the service performance of concrete structure, the process of corrosion expansion cracking of concrete cover is studied. Considering the stress state of reinforced concrete and the relative position of aggregate and crack, the cracking mode and the distribution of corrosion products are studied. It is of great significance to evaluate and repair the service performance of reinforced concrete structures by putting forward some suggestions for the design of corroded reinforced concrete beams. The paper is supported by the National High Technology Research and Development Program, the National High Technology Research and Development Program No. 2012AA050903, the National Natural Science Foundation of China, 51178413, 51008272 and 50838008, and the State key basic Research and Development Program, the State key basic Research and Development Program, 2009 CB623200).
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU375;TU312

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