本文選題：鋼筋銹蝕 + 混凝土梁��； 參考：《湖南大學(xué)》2015年碩士論文

【摘要】：沖擊荷載常對鋼筋混凝土結(jié)構(gòu)造成重大破壞,嚴(yán)重影響結(jié)構(gòu)的安全并危及人們的生命及財產(chǎn)安全。在沖擊荷載作用下,隨著材料應(yīng)變率效應(yīng)和結(jié)構(gòu)慣性效應(yīng)的出現(xiàn),結(jié)構(gòu)的材料性能、力學(xué)特性以及破壞形式明顯異于常規(guī)荷載作用下的結(jié)構(gòu)性能,結(jié)構(gòu)行為也更加復(fù)雜。鋼筋銹蝕常使得鋼筋混凝土結(jié)構(gòu)的性能出現(xiàn)劣化,進(jìn)而對混凝土結(jié)構(gòu)的安全和適用性造成重大影響。鋼筋銹蝕導(dǎo)致的結(jié)構(gòu)承載能力降低、破壞模式改變、粘結(jié)性能退化一直是海洋環(huán)境、近海環(huán)境以及某些特殊的工業(yè)環(huán)境下結(jié)構(gòu)安全的一大隱患。在混凝土結(jié)構(gòu)抗沖擊性能方面和耐久性退化問題方面,雖然對于兩者單獨(dú)的研究成果已不少見,但對于二者同時存在時結(jié)構(gòu)或構(gòu)件力學(xué)性能的研究卻尚未發(fā)現(xiàn)�；诖�,本文采用試驗研究的方式對銹蝕鋼筋混凝土梁的抗沖擊性能進(jìn)行研究,試圖揭示鋼筋混凝土梁破壞模式、抗沖擊能力和撓度變形等隨鋼筋銹蝕程度發(fā)展的劣化過程。本文主要研究工作如下:(1)通過對已有的鋼筋銹蝕后鋼筋與混凝土之間的粘結(jié)性能試驗的數(shù)據(jù)進(jìn)行收集和統(tǒng)計分析,提出了計算銹蝕后鋼筋與混凝土之間粘結(jié)強(qiáng)度的模型;(2)對鋼筋的加速銹蝕過程進(jìn)行了研究,介紹鋼筋混凝土梁靜電流加速銹蝕試驗的原理、試驗裝置以及銹蝕量的控制。對腐蝕后的試驗梁的銹脹破壞以及鋼筋的銹蝕形態(tài)進(jìn)行分析和討論;(3)對4根不同銹蝕程度的鋼筋混凝土梁進(jìn)行靜載試驗,研究混凝土梁的承載能力和和撓度變形隨鋼筋銹蝕程度發(fā)展的劣化過程。得到了縱筋銹蝕程度、銹脹裂縫平均寬度和最大寬度三個因素對梁抗剪承載力的影響規(guī)律;(4)對8根不同銹蝕鋼筋混凝土梁進(jìn)行落錘沖擊試驗研究,重點(diǎn)考察縱筋銹蝕程度和落錘沖擊速度對混凝土梁的沖擊破壞形態(tài)、錘頭沖擊力時程、支座反力時程和能量耗散方面所產(chǎn)生的影響,揭示鋼筋銹蝕程度對混凝土梁抗沖擊行為劣化過程的影響機(jī)理,最終提出了抗沖擊簡化計算公式。
[Abstract]:Impact loads often cause great damage to reinforced concrete structures, seriously affect the safety of structures and endanger people's lives and property safety. Under impact load, with the emergence of strain rate effect and inertia effect, the material properties, mechanical properties and failure forms of the structure are obviously different from those of the conventional load, and the structural behavior is more complex. The corrosion of steel bars often leads to the deterioration of the performance of reinforced concrete structures, which has a great impact on the safety and applicability of concrete structures. The corrosion of steel bar leads to the decrease of the structural bearing capacity, the change of the failure mode and the degradation of the bond property. It is always a hidden danger for the structural safety in the marine environment, the offshore environment and some special industrial environments. In the aspects of impact resistance and durability degradation of concrete structures, although it is not uncommon for them to be studied separately, the research on the mechanical properties of structures or members when they exist at the same time has not been found yet. Based on this, this paper studies the impact resistance of corroded reinforced concrete beams by means of experimental research, and attempts to reveal the deterioration process of reinforced concrete beams such as failure mode, impact resistance and deflection deformation with the development of corrosion degree of steel bars. The main research work of this paper is as follows: (1) through the collection and statistical analysis of the existing data of bond behavior test between corroded steel bar and concrete, A model for calculating the bond strength between corroded steel bar and concrete is presented. The accelerated corrosion process of steel bar is studied. The principle of static current accelerated corrosion test of reinforced concrete beam, the experimental device and the control of corrosion quantity are introduced. This paper analyzes and discusses the corrosion damage of corroded test beams and the corrosion morphology of steel bars. The static load tests of four reinforced concrete beams with different corrosion degrees are carried out. The deterioration process of the bearing capacity and deflection of concrete beams with the corrosion degree of steel bar is studied. The effects of three factors on the shear bearing capacity of the beams, including the corrosion degree of longitudinal reinforcement, the average width of rust expansion crack and the maximum width, are obtained. (4) eight corroded reinforced concrete beams with different corrosion are tested by drop weight impact test. The effects of corrosion degree of longitudinal reinforcement and impact velocity of drop weight on the impact failure pattern of concrete beam, the impact time history of hammer head, the time history of bearing reaction force and energy dissipation are investigated. The influence mechanism of the corrosion degree of steel bar on the deterioration process of concrete beam's impact behavior is revealed. Finally, a simplified formula for calculating the impact resistance is put forward.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU375.1

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