FRP-混凝土曲轴构件界面粘结机理及分析方法

发布时间：2018-05-19 00:12

本文选题：曲轴构件 + FRP　；参考：《长安大学》2014年硕士论文

【摘要】：近年来，不论国内还是国外，随着交通量的增大、车辆荷载的增加以及结构损伤、材料不断老化等多方面的原因，有很大一部分的现役桥梁出现了承载能力严重不足的现象，有些甚至出现了垮塌现象。鉴于此，关于现役的钢筋混凝土桥梁的加固研究刻不容缓。随着加固理论与技术的发展，纤维增强材料（FRP）加固钢筋混凝土桥梁得到了越来越广泛的应用。近些年，纤维增强材料加固梁桥无论从理论计算还是实际加固技术方面都日趋成熟，但是对于拱桥等曲轴形式桥梁的加固理论研究则相对较少，只停留在经验方面，对于纤维增强材料加固曲轴构件的界面粘结机理、界面破坏模式的研究还有待进一步深入。本文重点研究了FRP加固混凝土曲轴构件的界面粘结机理。首先，文中通过对FRP加固的曲轴构件试验研究的分析，回归了界面应变、粘结应力以及粘结滑移关系等界面关键参数；利用界面粘结参数，借助通用有限元程序ABAQUS采用内聚力模型对纤维加固钢筋混凝土模型拱进行了分析，并且与相应文献中的试验结果进行了对比分析，分析结果基本一致，从而验证了有限元模型的准确性。其次，文中选取了钢筋混凝土拱桥主拱圈上的一个微元体，利用弹性力学、材料力学及结构力学的相关理论，，得到了FRP加固混凝土拱桥界面粘结剪应力与剥离正应力的计算公式，并通过试验结果验证了公式的合理性。本文的研究为FRP加固混凝土曲轴形式桥梁提供了一个有效的界面粘结应力计算方法，为以后FRP加固曲轴形式桥梁提供了理论指导以及借鉴意义。
[Abstract]:In recent years, with the increase of traffic volume, the increase of vehicle load, the damage of structure, the aging of materials and so on, a large part of active bridges have appeared the phenomenon of serious shortage of carrying capacity, both at home and abroad. Some have even collapsed. In view of this, it is urgent to study the reinforcement of existing reinforced concrete bridges. With the development of reinforcement theory and technology, reinforced concrete bridge strengthened with fiber reinforced material (FRP) has been applied more and more widely. In recent years, the reinforcement of beam bridges with fiber reinforced materials has become more and more mature in terms of theoretical calculation and practical reinforcement techniques. However, the theoretical study on the reinforcement of crankshaft bridges such as arch bridges is relatively few, and only stays in experience. The mechanism of interfacial bonding of crankshaft members strengthened with fiber reinforced materials and the study of interfacial failure mode need to be further studied. In this paper, the interfacial bonding mechanism of concrete crankshaft members strengthened with FRP is studied. Firstly, by analyzing the experimental study of crankshaft members strengthened by FRP, the key interface parameters such as interface strain, bond stress and bond-slip relationship are regressed. With the help of the universal finite element program ABAQUS, the cohesive force model is used to analyze the reinforced concrete model arch strengthened by fiber, and the results are compared with the experimental results in the corresponding literature. The results are basically consistent. The accuracy of the finite element model is verified. Secondly, a micro-element body on the main arch ring of reinforced concrete arch bridge is selected, and the theories of elastic mechanics, material mechanics and structural mechanics are used. The calculation formulas of bond shear stress and peeling normal stress at the interface of FRP reinforced concrete arch bridge are obtained, and the rationality of the formula is verified by the experimental results. The research in this paper provides an effective method for calculating the interfacial bond stress of concrete crankshaft type bridge strengthened by FRP, and provides theoretical guidance and reference significance for the future strengthening of crankshaft type bridge with FRP.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.72;U441

【参考文献】