本文選題：鋼筋銹蝕 + 環(huán)向約束�。� 參考：《深圳大學(xué)》2017年碩士論文

【摘要】：鋼筋與混凝土間的可靠粘結(jié)是兩者共同工作的前提基礎(chǔ),鋼筋銹蝕是鋼筋-混凝土界面粘結(jié)性能退化的主要原因。鋼筋銹蝕不僅引起自身截面的損失和力學(xué)性能的退化,且銹蝕產(chǎn)物的體積膨脹(往往為原來的2-4倍)將引起混凝土保護(hù)層開裂,因而破壞鋼筋-混凝土的界面粘結(jié)性能,嚴(yán)重地危害鋼筋混凝土結(jié)構(gòu)的安全。鋼筋混凝土結(jié)構(gòu)在銹蝕的同時(shí)往往承受著使用荷載且結(jié)構(gòu)中存在約束,而約束應(yīng)力和持荷作用的存在對(duì)鋼筋混凝土的銹脹和粘結(jié)必然有一定的影響,總的來說結(jié)構(gòu)在諸多因素組合的復(fù)雜環(huán)境中經(jīng)受著嚴(yán)峻的考驗(yàn)。為了盡可能的模擬實(shí)際工程中結(jié)構(gòu)所處環(huán)境,本文將研究環(huán)向約束、持荷作用、鋼筋銹蝕率以及相對(duì)保護(hù)層等參數(shù)對(duì)鋼筋混凝土銹脹和動(dòng)力粘結(jié)的影響,主要內(nèi)容包括以下工作:基于銹蝕產(chǎn)物體積協(xié)調(diào)和Fe元素守恒,考慮混凝土開裂的彈性回縮,建立了環(huán)向約束下試件表面裂縫寬度隨銹蝕率時(shí)變模型;通過XCT微觀試驗(yàn)研究銹蝕率、環(huán)向約束、相對(duì)保護(hù)層等因素,如何影響模型參數(shù)銹蝕產(chǎn)物填充膨脹率n。通過鋼筋混凝土銹脹試驗(yàn)系統(tǒng)的研究了各參數(shù)對(duì)銹脹的影響,并用試驗(yàn)數(shù)據(jù)驗(yàn)證了理論模型的合理性。對(duì)不同銹蝕率、環(huán)向約束、相對(duì)保護(hù)層、持載應(yīng)力等參數(shù)耦合下的粘結(jié)試件進(jìn)行了單向加載,結(jié)果表明:環(huán)向約束下試件的粘結(jié)性能,隨鋼筋銹蝕率的增加先增大后減小;環(huán)向約束剛度、持載應(yīng)力等級(jí)、相對(duì)保護(hù)層等都對(duì)試件的粘結(jié)性能有提升。對(duì)銹蝕鋼筋混凝土粘結(jié)試件進(jìn)行了變幅循環(huán)加載,并通過加載過程中粘結(jié)強(qiáng)度、粘結(jié)剛度以及耗能能力等指標(biāo)評(píng)估了試件的粘結(jié)性能。研究發(fā)現(xiàn):銹蝕率對(duì)于變幅循環(huán)粘結(jié)性能的影響也是先增大后減小;環(huán)向約束對(duì)于試件的變幅循環(huán)粘結(jié)性能有很大程度上的提升,尤其是施加了持載的銹蝕試件提升更加明顯;相對(duì)保護(hù)層對(duì)試件的變幅循環(huán)粘結(jié)性能也有一定程度的提升;持載應(yīng)力的存在使得試件的變幅循環(huán)粘結(jié)性能得到了提升,但隨著持載應(yīng)力比例的增大提升幅度逐漸降低。
[Abstract]:The reliable bond between steel bar and concrete is the premise of their joint work, and the corrosion of steel bar is the main reason for the degradation of bond performance between reinforcement and concrete interface. The corrosion of steel bars not only causes the loss of the section and the degradation of mechanical properties, but also the volume expansion of the corrosion products (usually 2-4 times of the original) will lead to the cracking of the concrete cover, thus destroying the interfacial bond property of the steel bar and concrete. Seriously endangering the safety of reinforced concrete structures. The reinforced concrete structure is often subjected to the use of the load and there are constraints in the structure while the corrosion of the reinforced concrete structure. However, the existence of the constraint stress and the holding load must have a certain impact on the corrosion expansion and bond of the reinforced concrete. In general, the structure is subjected to severe test in the complex environment of many factors combination. In order to simulate the environment of the structure in practical engineering as far as possible, this paper will study the influence of the parameters such as circumferential constraint, load retention, corrosion rate of steel bar and relative protective layer on the corrosion expansion and dynamic bond of reinforced concrete. The main contents are as follows: based on the volume coordination of corrosion products and the conservation of Fe element, considering the elastic shrinkage of concrete cracking, a time-varying model of surface crack width with corrosion rate under circumferential constraint is established. The effects of corrosion rate, circumferential constraint and relative protective layer on the filling expansion rate of corrosion products were studied by XCT microcosmic test. The influence of various parameters on the corrosion expansion of reinforced concrete was studied by means of the test system, and the rationality of the theoretical model was verified by the test data. Unidirectional loading of bonded specimens with different corrosion rates, circumferential constraints, relative protective layer, and load holding stress is carried out. The results show that the bond properties of the specimens under circumferential constraints first increase and then decrease with the increase of corrosion rate of steel bars. The bond properties of the specimens are improved by toroidal restraint stiffness, stress grade and relative protective layer. The cyclic loading of corroded reinforced concrete bonded specimens was carried out, and the bond properties of the specimens were evaluated by the bond strength, bond stiffness and energy dissipation capacity during the loading process. It is found that the effect of corrosion rate on cyclic bond properties of the specimens increases first and then decreases, and that the circumferential constraints improve the cyclic bond properties of the specimens to a great extent, especially for the specimens with holding load. The cyclic bond properties of the specimens were improved to a certain extent by the relative protective layer, and the cyclic bond properties of the specimens were improved by the existence of the holding stress, but gradually decreased with the increase of the ratio of the holding stress.
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU375

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