【摘要】：鋼筋的銹蝕不僅使有效截面面積減少,而且會(huì)使其與混凝土的粘結(jié)性能發(fā)生退化。那些承受偶然荷載的結(jié)構(gòu)，其銹蝕后仍需要抵御包括地震等荷載的作用，因此研究銹蝕鋼筋混凝土在反復(fù)荷載作用下的粘結(jié)性能，建立銹蝕鋼筋混凝土在反復(fù)荷載作用下的粘結(jié)滑移本構(gòu)關(guān)系對(duì)正在服役結(jié)構(gòu)的動(dòng)力分析是相當(dāng)重要的。本文從粘結(jié)性方面入手，研究不同鋼筋類型和不同銹蝕率對(duì)混凝土與鋼筋粘結(jié)性能的影響，探究了反復(fù)荷載下銹蝕鋼筋混凝土的粘結(jié)機(jī)理，并對(duì)粘結(jié)滑移數(shù)據(jù)進(jìn)行數(shù)值擬合。基于實(shí)驗(yàn)數(shù)據(jù)，建立了反復(fù)荷載下，銹蝕鋼筋與混凝土的粘結(jié)滑移本構(gòu)關(guān)系。 本文主要研究工作如下： 1.在前期課題組單向加載銹蝕鋼筋混凝土粘結(jié)性能試驗(yàn)研究的基礎(chǔ)上，選用不同銹蝕率的光面鋼筋和帶肋鋼筋制備同強(qiáng)度等級(jí)的混凝土中心拉拔試件，得到反復(fù)荷載作用下銹蝕鋼筋與混凝土之間的粘結(jié)-滑移關(guān)系曲線，結(jié)果顯示：在混凝土強(qiáng)度和鋼筋直徑相同的情況下，銹蝕率在2.16%~4.22%，混凝土與光面鋼筋的極限粘結(jié)應(yīng)力隨著銹蝕率的增加有增大的趨勢(shì)；當(dāng)銹蝕率在4.22%~8.17%，其隨著銹蝕率的增大而降低；銹蝕率在3.76%~12.85%，混凝土與帶肋鋼筋的極限粘結(jié)性能隨著銹蝕率的增加逐漸降低，但帶肋鋼筋的粘結(jié)性能優(yōu)于光圓鋼筋的。反復(fù)荷載下，光圓鋼筋的粘結(jié)性能退化最大的是試件出現(xiàn)極限粘結(jié)應(yīng)力滑移后的循環(huán)中，，而帶肋鋼筋的粘結(jié)性能退化最大的發(fā)生在內(nèi)凹與外凸變化的循環(huán)中。 2.在試驗(yàn)的基礎(chǔ)上，對(duì)試驗(yàn)結(jié)果進(jìn)行了分析，給出鋼筋種類、試件銹蝕率對(duì)粘結(jié)強(qiáng)度的影響規(guī)律。采用數(shù)理統(tǒng)計(jì)方法擬合出粘結(jié)-滑移曲線，找出了能較好表述鋼筋銹蝕程度與粘結(jié)應(yīng)力的參數(shù)，分別建立了反復(fù)荷載作用下銹蝕光圓和帶肋鋼筋與混凝土的本構(gòu)關(guān)系，為銹蝕鋼筋混凝土構(gòu)件或結(jié)構(gòu)的受力分析提供基礎(chǔ)數(shù)據(jù)和模型。
[Abstract]:The corrosion of steel bars not only reduces the effective cross-section area, but also degrades its bond performance with concrete. Those structures subjected to accidental loads still need to resist the effects of earthquake and other loads after corrosion, so the bond behavior of corroded reinforced concrete under repeated loads is studied. It is very important to establish the bond-slip constitutive relation of corroded reinforced concrete under repeated load for the dynamic analysis of the structure in service. In this paper, the effects of different types of steel bars and different corrosion rates on the bond properties of concrete and steel bar are studied, and the bonding mechanism of corroded reinforced concrete under repeated loading is discussed. The bond-slip data are fitted numerically. Based on the experimental data, the bond-slip constitutive relation of corroded steel bar and concrete under repeated load is established. The main work of this paper is as follows: 1. On the basis of the experimental study on the bond behavior of corroded reinforced concrete under unidirectional loading, the specimens with the same strength grade were prepared by using smooth steel bars with different corrosion rates and ribbed steel bars. The bond slip relation curve between corroded steel bar and concrete under repeated load is obtained. The results show that the corrosion rate is 2.16 and 4.22 when the strength and diameter of steel bar are the same. The ultimate bond stress between concrete and smooth steel bar increases with the increase of corrosion rate. When the corrosion rate is 4.222.17, the corrosion rate decreases with the increase of corrosion rate. The corrosion rate is 3.76 ~ 12.85. The ultimate bond property between concrete and ribbed steel bar decreases gradually with the increase of corrosion rate, but the bond property of ribbed steel bar is better than that of smooth circular steel bar. Under repeated loading, the bond behavior of smooth circular steel bar degenerates the most in the cycle after ultimate bond stress slip, while the bond behavior of ribbed steel bar degenerates most in the cycle of internal concave and convex variation. 2. On the basis of the experiment, the experimental results are analyzed, and the influence of the type of steel bar and the corrosion rate of the specimen on the bond strength is given. By using mathematical statistical method to fit the bond-slip curve, the parameters which can better describe the corrosion degree and bond stress of steel bar are found, and the constitutive relations between corroded smooth circular bar and ribbed steel bar and concrete under repeated load are established, respectively. Provide the basic data and model for the stress analysis of corroded reinforced concrete members or structures.
【學(xué)位授予單位】：華北水利水電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU375

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