【摘要】：高架橋作為交通網(wǎng)絡(luò)中的重要組成部分,當(dāng)?shù)卣饋?lái)臨時(shí),高架橋能否正常使用決定了救災(zāi)物資能否第一時(shí)間內(nèi)運(yùn)進(jìn)災(zāi)區(qū)以及地震傷員能否第一時(shí)間得到救治,所以它們的安全性顯得異常重要。諸多地震災(zāi)害調(diào)查報(bào)告表明,橋梁在地震過(guò)程中發(fā)生嚴(yán)重破壞甚至倒塌主要是由于橋墩的破壞所致。由于鋼筋混凝土橋墩在地震作用下容易在柱腳附近造成損傷,作為該類(lèi)橋墩的加固方法,在鋼筋混凝土橋墩周?chē)摪宓姆椒ǖ玫綇V泛采用。然而實(shí)際使用中發(fā)現(xiàn),由于積水、腐蝕環(huán)境等的影響,鋼板出現(xiàn)了不同程度的銹蝕現(xiàn)象,這些由銹蝕引起的損傷對(duì)于外包鋼板加固鋼筋混凝土橋墩產(chǎn)生多大影響,需要通過(guò)試驗(yàn)和數(shù)值模擬方法加以研究。本文以外包鋼板加固鋼筋混凝土橋墩為研究對(duì)象,采用二維和三維彈塑性有限元分析方法,研究不同銹蝕模式以及由銹蝕引起的鋼板與混凝土間粘結(jié)性能退化對(duì)橋墩水平承載力與滯回性能的影響規(guī)律。開(kāi)展的研究工作以及得出的主要結(jié)論如下:(1)建立二維彈塑性有限元分析模型研究橋墩底部附近鋼板銹蝕率、銹蝕模式等參數(shù)對(duì)橋墩水平承載力的影響。研究發(fā)現(xiàn)橋墩的水平承載力隨著底部鋼板銹蝕率的增加而減小。對(duì)于腹板而言,局部銹蝕模式引起的水平承載力劣化遠(yuǎn)大于均勻銹蝕模式。(2)建立三維彈塑性有限元分析模型研究橋墩底部鋼板銹蝕位置、鋼板厚度方向銹蝕程度、寬度方向銹蝕范圍、以及由銹蝕導(dǎo)致的鋼板-混凝土界面粘結(jié)性能退化等參數(shù)對(duì)橋墩水平承載力的影響。研究發(fā)現(xiàn),鋼板底部附近高度方向小范圍的局部銹蝕對(duì)橋墩水平承載力影響不大;當(dāng)腹板底部寬度方向局部銹蝕時(shí),橋墩水平承載力的退化程度與鋼板銹蝕位置、厚度方向銹蝕深度以及銹蝕影響范圍等密切相關(guān),而翼緣底部寬度方向局部銹蝕時(shí)橋墩水平承載力的退化程度僅與厚度方向銹蝕深度以及銹蝕影響范圍相關(guān),與銹蝕位置無(wú)關(guān);隨著鋼板與混凝土界面粘結(jié)性能的不斷退化,兩者協(xié)同工作能力不斷下降,橋墩的水平承載力也逐漸降低。(3)建立以底部鋼板銹蝕程度、鋼板與混凝土界面粘結(jié)性能為變化參數(shù)的三維彈塑性有限元分析模型,從骨架曲線、延性系數(shù)、剛度退化系數(shù)、等效粘滯阻尼系數(shù)等四個(gè)方面研究上述變化參數(shù)對(duì)橋墩抗震性能的影響。計(jì)算結(jié)果表明,隨著鋼板底部銹蝕情況越嚴(yán)重,其抗震性能越差;鋼板與混凝土間粘結(jié)性能越好,則其抗震性能越佳。以上研究成果有望為現(xiàn)役橋墩的維護(hù)管理與加固提供參考依據(jù)。
[Abstract]:Viaduct is an important part of traffic network. When the earthquake comes, the normal use of viaduct determines whether the relief materials can be transported into the disaster area in the first time, and whether the injured in the earthquake can be treated in the first time. So their safety is extremely important. Many seismic disaster investigation reports show that the serious damage and even collapse of bridges in the course of earthquake is mainly caused by the damage of bridge piers. As the reinforced concrete pier is easy to cause damage near the column foot under seismic action, as the reinforcement method of this kind of pier, the method of enclosing steel plate around the reinforced concrete pier is widely used. However, it is found in practical use that due to the influence of water and corrosion environment, the steel plate has different degree of corrosion phenomenon, and the damage caused by corrosion has a great impact on the reinforcement of reinforced concrete pier strengthened with steel plate. It needs to be studied by means of experiments and numerical simulation. In this paper, the reinforced concrete pier strengthened with steel plate is used as the research object, and the two-dimensional and three-dimensional elastic-plastic finite element analysis method is used. The effects of different corrosion modes and the degradation of bond behavior between steel plate and concrete on the horizontal bearing capacity and hysteretic behavior of pier are studied. The main conclusions are as follows: (1) A two-dimensional elastic-plastic finite element analysis model is established to study the influence of steel plate corrosion rate and corrosion model on the horizontal bearing capacity of the pier. It is found that the horizontal bearing capacity of the pier decreases with the increase of the corrosion rate of the bottom steel plate. For web, the horizontal bearing capacity deterioration caused by local corrosion mode is much larger than that caused by uniform corrosion mode. (2) Three-dimensional elastic-plastic finite element analysis model is established to study the corrosion location of steel plate at the bottom of pier and the corrosion degree of steel plate thickness. The influence of the corrosion range in width direction and the degradation of bond behavior between steel plate and concrete interface caused by corrosion on the horizontal bearing capacity of pier. It is found that the horizontal bearing capacity of the pier is not affected by the local corrosion in the direction of the height near the bottom of the steel plate, and the degradation degree of the horizontal bearing capacity of the pier and the corrosion position of the steel plate are obtained when the width direction of the web bottom is locally corroded. The thickness direction corrosion depth and corrosion influence range are closely related, while the horizontal bearing capacity degradation degree of bridge pier is only related to thickness direction corrosion depth and corrosion effect range, but not to corrosion location when the width direction of flange is partial corrosion. With the continuous degradation of the bond property between steel plate and concrete interface, the cooperative working ability of both decreases, and the horizontal bearing capacity of bridge pier decreases gradually. (3) the corrosion degree of steel plate at the bottom is established. Three-dimensional elastic-plastic finite element analysis model with the interface bond property of steel plate and concrete as variable parameter, from skeleton curve, ductility coefficient, stiffness degradation coefficient, The influence of the above parameters on the seismic performance of pier is studied from four aspects, such as equivalent viscous damping coefficient. The results show that the worse the corrosion at the bottom of the steel plate is, the worse the seismic behavior is, and the better the bond performance between the steel plate and concrete is, the better the seismic performance is. The above research results are expected to provide a reference for the maintenance, management and reinforcement of existing piers.
【學(xué)位授予單位】：上海交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U443.22;U441

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