本文選題：銹蝕混凝土結構　切入點：相似理論　出處：《江蘇大學》2017年碩士論文　論文類型：學位論文

【摘要】：混凝土結構耐久性不足已經給世界各國造成了巨大的經濟損失和社會、環(huán)境影響。當今世界,引起混凝土結構耐久性不足、甚至破壞的原因有很多,如鋼筋銹蝕、凍害以及侵蝕環(huán)境下的物理化學作用等,其中以鋼筋銹蝕問題最為突出。鋼筋銹蝕不僅會減小鋼筋有效截面積和改變鋼筋材料性能,還會導致鋼筋混凝土之間的粘結性能發(fā)生退化,進而嚴重影響混凝土結構的承載能力。因此,研究銹蝕混凝土結構性能劣化規(guī)律,對準確評估在役結構耐久性以及全壽命預測具有重要的理論意義和實際意義。本文結合國內外已有研究成果,在國家自然科學基金項目"基于鋼筋銹蝕耐久性的混凝土結構全壽命性能及設計理論研究(51378241)"的資助下對氯鹽與荷載耦合作用下混凝土結構性能劣化的相似性進行了研究,主要的研究工作如下;(1)荷載作用下混凝土中氯離子侵蝕規(guī)律的研究。在Fick第二定律的基礎上,考慮荷載與環(huán)境(溫度、相對濕度)對氯離子擴散規(guī)律的影響,對Fick第二定律進行了修正。推導出混凝土結構氯離子一維擴散區(qū)域與二維擴散區(qū)域內鋼筋初銹時間計算方法。相關內容可以為研究自然環(huán)境多因素耦合作用下氯離子擴散規(guī)律提供一個理論參考。(2)氯鹽與荷載耦合作用下,混凝土構件內鋼筋銹蝕率的相似模型研究。在法拉第銹蝕定律的基礎上,分析已有腐蝕電流密度模型的優(yōu)劣點,確定本文采用的腐蝕電流密度模型。當兩種氯鹽環(huán)境(自然環(huán)境與恒電流通電加速環(huán)境)與荷載耦合作用下的鋼筋銹蝕率接近時假設二者相等,以鋼筋銹蝕率為紐帶,建立基于鋼筋銹蝕率的時間相似模型。開展自然環(huán)境試驗與恒電流通電加速試驗,并以恒電流通電加速試驗中通電160h的構件為例,求得兩種氯鹽環(huán)境與荷載耦合作用下構件同時達到4%鋼筋銹蝕率的時間相似系數(shù)λ_(t,η_s)=0.025,利用λ_(t,η_s)的值求得自然環(huán)境試驗構件的銹蝕時間為4a,與試驗值(1400d)誤差為4.29%。相關內容為預測自然環(huán)境下混凝土結構內鋼筋銹蝕率提供一定的理論參考。(3)氯鹽與荷載耦合作用下,混凝土構件內鋼筋銹脹力的相似模型研究。分別利用厚壁圓筒模型以及極坐標法建立鋼筋均勻銹脹力以及非均勻銹脹力計算模型,推導出鋼筋銹脹力與銹蝕時間的關系模型。當兩種氯鹽環(huán)境(自然環(huán)境與恒電流通電加速環(huán)境)與荷載耦合作用下的鋼筋銹脹力接近時假設二者相等,以鋼筋銹脹力為紐帶,建立基于鋼筋銹脹力的時間相似模型。開展自然環(huán)境試驗,并以恒電流通電加速試驗中通電12h的構件為例,求得兩種氯鹽環(huán)境與荷載耦合作用下構件內鋼筋銹脹力同時達到5.42MPa的時間相似系數(shù)λt,qr=0.178,利用λt,qr的值求得自然環(huán)境試驗構件的銹蝕時間為2.136a。相關內容為預測自然環(huán)境下混凝土結構內鋼筋銹脹力以及保護層銹脹開裂時間提供一定的理論參考。(4)氯鹽與荷載耦合作用下,混凝土構件內銹蝕鋼筋與混凝土之間粘結強度的相似模型研究。基于多軸應力狀態(tài)下的Mohor-Coulomb強度破壞準則,求得混凝土構件粘結滑移破壞過程中4個臨界狀態(tài)(內裂狀態(tài)、劈裂狀態(tài)、極限狀態(tài)和殘余狀態(tài))的粘結強度。當兩種氯鹽環(huán)境(自然環(huán)境與恒電流通電加速環(huán)境)與荷載耦合作用下粘結強度接近時假設二者相等,以粘結強度為紐帶,建立基于粘結強度的時間相似模型。以恒電流通電加速試驗中通電12h的構件為例,求得兩種氯鹽環(huán)境與荷載耦合作用下構件內裂強度、劈裂強度、極限強度和殘余強度分別同時達到4.25MPa、7.98MPa、9.13MPa 和 1.47MPa 的時間相似系數(shù)分別是 0.005、0.00511、0.00598 和 0.00545,并且利用時間相似系數(shù)的值求得自然環(huán)境試驗構件的銹蝕時間分別為0.06a、0.0613a、0.0718a和0.0654a。相關內容為預測自然環(huán)境下混凝土結構內粘結強度提供一定的理論參考。
[Abstract]:Durability of concrete structures has caused tremendous economic losses and social and environmental impact to the world. In today's world, caused by the lack of durability of concrete structure, and many reasons of damage, such as corrosion, damage and erosion under the environment of physical and chemical effects, the steel corrosion is a prominent problem of steel corrosion. Not only can reduce the effective cross-sectional area of reinforcing steel and reinforced material properties, will also cause the bond performance of reinforced concrete between the degraded, and seriously influence the bearing capacity of the concrete structure. Therefore, the research of corroded concrete structure performance deterioration, the accurate evaluation has important theoretical significance and practical significance in the durability of existing structure and life forecast. This paper reviewed the existing research results, in the National Natural Science Fund Project "concrete based on durability of reinforcement corrosion Study on the structure of whole life performance and design theory (51378241) "supported by the similarity of chloride and load coupling properties degradation of concrete structures are studied, the main research work are as follows; (1) study on the erosion of chloride ions in concrete under load. Based on Fick's second law. Considering the load and environment (temperature, humidity) on the effects of chloride diffusion, the Fick's second law was amended. Derive the concrete structure of chloride ion diffusion region and one-dimensional two-dimensional calculation method of diffusion region of initial corrosion time of steel bar. The related content can provide a theoretical reference for the diffusion of chloride coupling factors study on the natural environment. (2) chloride and load coupling, research on similarity model of steel corrosion rate in concrete structures. Based on Faraday's law of corrosion on the analysis of the corrosion current The merits of density model, determine the corrosion current density model used in this paper. When the two kinds of chlorine salt environment (natural environment and constant current power acceleration environment) and steel corrosion loading rate is close to two when the assumptions are identical to the corrosion rate of steel as a link, Jian Liji on the steel corrosion rate time similarity model. Carry out natural environmental test and the constant current power and accelerated test, with the constant current power to accelerate the electricity 160H component test case, obtained two kinds of chlorine salt environment and load coupling component also reached 4% steel corrosion rate time similar coefficient _ (T, _s =0.025, by using lambda ETA) _ (T, n _s) value of the corrosion time obtained natural environmental test component is 4a, and the test value (1400d) error of 4.29%. related content for the prediction of the natural environment in the concrete structure corrosion rate to provide a theoretical reference. (3) chloride and load coupling By study, similar model in concrete structures reinforced expansive force are established. The uniform expansion force of reinforced by thick wall cylinder model and the polar coordinate method and non uniform expansion force calculation model, deduces the relation model of corroded expansion force and the corrosion time. When the two kinds of chlorine salt environment (natural environment and constant current power acceleration environment) and close to the reinforcing load coupling when assuming that the two are equal to the reinforcing ties, the establishment of corroded expansion force based on the similar model. The time of natural environmental test, and with the constant current power to accelerate the power 12h component test as an example the two component, chlorine salt environment and load coupling in the corroded expansion force and time to 5.42MPa similar coefficient of T, qr=0.178, using lambda T, QR obtained the natural environmental test component corrosion time is 2.136a. in the pre Provide a theoretical reference for measuring the natural environment in the concrete structure reinforcing and cracking time. (4) chloride and load coupling, of similar model bond strength between steel bar and concrete in reinforced concrete members. The multiaxial Mohor-Coulomb strength failure criterion based on the state. 4 critical state obtained concrete bond slip failure process (internal crack, split state, limit state and residual state) of the bond strength. When the two kinds of chlorine salt environment (natural environment and the constant current power and acceleration environment) close to the bond strength load coupling assumption two equal to bond the strength of ties, the establishment of similar model of bond strength based on time. With the constant current power to accelerate the electricity 12h component test case, obtained two kinds of component chloride environment and loading coupling in tensile strength , splitting strength, ultimate strength and residual strength were also reached 4.25MPa, 7.98MPa, 9.13MPa and 1.47MPa time similarity coefficient is 0.005,0.00511,0.00598 and 0.00545 respectively, and the similarity coefficient value is calculated using the time of natural environmental test rusting time were 0.06a, 0.0613a, 0.0718a and 0.0654a. related content for the prediction to provide a theoretical reference for concrete in the structure of bond strength under natural environment.

【學位授予單位】：江蘇大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU375

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