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  本文關(guān)鍵詞：銹蝕鋼筋混凝土構(gòu)件承載力研究　出處：《遼寧工程技術(shù)大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 鋼筋銹蝕 電化學(xué)加速銹蝕 承載力研究 數(shù)值模擬

【摘要】：鋼筋銹蝕是引起混凝土結(jié)構(gòu)性能退化的最主要因素之一，現(xiàn)階段迫切需要研究銹蝕鋼筋混凝土構(gòu)件的力學(xué)性能及其剩余承載力。論文主要分三個步驟進(jìn)行構(gòu)件承載力研究：混凝土中的鋼筋銹蝕機(jī)理及電化學(xué)加速銹蝕實(shí)驗(yàn)研究、無銹蝕有限元模型驗(yàn)證和銹蝕有限元模擬研究。 首先剖析了混凝土中鋼筋的銹蝕機(jī)理，混凝土中的鋼筋銹蝕經(jīng)歷兩個步驟：首先是混凝土中性化和氯離子侵蝕造成在鋼筋表面鈍化膜破壞，之后鋼筋失去保護(hù)，重新呈活化態(tài)，鋼筋發(fā)生電化學(xué)銹蝕。在銹蝕機(jī)理研究的基礎(chǔ)上，對電化學(xué)加速銹蝕實(shí)驗(yàn)進(jìn)行了研究，分析了各類銹蝕實(shí)驗(yàn)與實(shí)際結(jié)構(gòu)的相關(guān)性，為設(shè)計(jì)電化學(xué)加速銹蝕實(shí)驗(yàn)方法提供理論基礎(chǔ)。 其次進(jìn)行了無銹蝕有限元模型驗(yàn)證，制作了六根鋼筋混凝土簡支梁，構(gòu)件尺寸更加貼合實(shí)際，并設(shè)計(jì)了一種新的箍筋彎折工具。在縱筋與箍筋的交接處采取了一種新的絕緣方式，應(yīng)用于實(shí)驗(yàn)構(gòu)件的制作。設(shè)計(jì)并制作了分配梁、反力梁和模板，通過無銹蝕簡支梁的加載試驗(yàn)判斷所建立的考慮滑移的無銹蝕有限元模型是合理的，為進(jìn)行考慮滑移的銹蝕鋼筋混凝土簡支梁承載力數(shù)值分析做了充分準(zhǔn)備。 最后在考慮滑移的無銹蝕模型合理的基礎(chǔ)上，進(jìn)行考慮滑移的銹蝕鋼筋混凝土簡支梁承載力數(shù)值分析�；炷羻卧捎肧OLID65單元，鋼筋單元采用LINK8單元，鋼筋-混凝土界面的粘結(jié)滑移關(guān)系采用Combine39三維非線性彈簧單元模擬，并將銹蝕鋼筋與混凝土界面的局部粘結(jié)應(yīng)力與局部滑移關(guān)系的本構(gòu)模型引入Combine39彈簧單元，通過設(shè)置不同的銹蝕率以分析構(gòu)件的承載力變化及破壞失效情況，同時考慮鋼筋銹蝕造成的鋼筋截面減少和屈服強(qiáng)度降低這兩種因素，，建立了銹蝕鋼筋混凝土簡支梁的有限元模型并進(jìn)行了承載力的計(jì)算，結(jié)果表明：隨著銹蝕率的增加，梁的剛度降低、鋼筋與混凝土之間的相對滑移增大、裂縫向跨中靠近、承載力明顯降低并由延性破壞向脆性破壞轉(zhuǎn)變。
[Abstract]:The corrosion of reinforcement is one of the most important factors causing deterioration of structural performance of concrete, the mechanical properties of the present stage is an urgent need to study the corrosion of reinforced concrete members and its residual capacity. The thesis is divided into three steps: Study on bearing capacity experimental study on accelerating corrosion of steel in concrete corrosion and electrochemical corrosion mechanism, finite element model verification and the corrosion study of finite element simulation.
The first analysis of the corrosion mechanism of reinforced concrete, steel corrosion in concrete through two steps: the first is the concrete carbonation and chloride ion erosion damage on the surface of steel passivation film, after losing reinforced protection, was re activated, the electrochemical corrosion of steel. Based on the study of corrosion mechanism on the electrochemical accelerated the corrosion experiments were conducted to study the correlation analysis and the actual structure of various types of corrosion experiment, provide a theoretical basis for the design of electrochemical accelerated corrosion experiments.
Secondly, no corrosion finite element model verification, made six reinforced concrete beams, the component size is more realistic, and designed a new stirrup bending tool. In the junction of longitudinal bars and stirrups adopted a new insulation, applied to manufacture the components. Designed and fabricated distribution of beam, the reaction beam and the template, by loading test no corrosion beam established no corrosion finite element model considering the slip is reasonable, for the consideration of reinforced concrete beam sliding bearing capacity numerical analysis has made full preparations.
Finally, considering the non slip corrosion model on the basis of reasonable, considering the corrosion of reinforced concrete beam sliding bearing capacity analysis. Numerical concrete elements using SOLID65 unit, steel units of the LINK8 unit, bond slip relationship reinforced concrete interface by using Combine39 three-dimensional nonlinear spring element simulation, and the local bonding interface of corroded steel bars and concrete stress and local slip constitutive relation model is introduced into Combine39 spring element, by setting different corrosion rate in the bearing capacity and the failure of the component change analysis, considering the reinforcement steel corrosion caused by the decrease of yield strength and reduce these two kinds of factors, established the finite element model of corroded reinforced concrete beams and the the bearing capacity calculation, the results show that with the increase of the corrosion rate, just reduce the beam of steel and concrete The relative slip between them increases and the crack is closer to the middle of the span. The bearing capacity of the crack is obviously reduced and the ductile failure is changed from the ductile failure to the brittle failure.

【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU375

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