钢板—混凝土组合加固矩形梁抗弯承载能力试验研究

发布时间：2018-04-17 21:47

本文选题：钢板—混凝土组合加固 + 桥梁加固　；参考：《重庆交通大学》2015年硕士论文

【摘要】：如何快速有效得对受损桥梁进行加固与维修,使其恢复使用能力是目前工程界较为关注的热点之一。钢板—混凝土组合加固是在钢板上焊接栓钉、原结构表面植筋,并向其浇注混凝土,使得原结构与后加固部分形成整体共同受力的加固技术。本文设计了3组共7根钢板—混凝土组合加固矩形梁,一方面在对原梁进行加固前先预压一定的初始荷载,使得原梁存在损伤的同时保持该初始荷载施加的情况下进行组合加固,通过对比以研究二次受力作用下不同初始荷载对钢板—混凝土组合加固矩形梁抗弯性能的影响。另一方面,为更好的解决片材加固中的剥离破坏问题,本试验将在原梁进行钢板—混凝土组合抗弯加固的基础上,提出在其端部进行外包钢板—混凝土组合加固,通过试验验证该方法的可行性以及其对剥离破坏的影响,更好得为实际工程加固中提供依据。试验过程中,观察试验梁从加载到破坏的各阶段现象,对其抗弯承载力、变形以及应变结果进行了详细的分析。揭示了钢板—混凝土组合加固矩形梁的受力状况与破坏机理;同时,对比理论计算值,验证了组合加固的有效性。
[Abstract]:How to reinforce and maintain the damaged bridge quickly and effectively is one of the hotspots in the engineering field.Steel plate and concrete composite reinforcement is a kind of strengthening technology, which is welding bolt on steel plate, planting reinforcement on the surface of the original structure, and pouring concrete to it, which makes the original structure and the post-strengthened part form a common force together.In this paper, three groups of 7 steel plate concrete composite strengthened rectangular beams are designed. On the one hand, the initial load is preloaded before the original beam is strengthened.In order to study the effect of different initial loads on the flexural behavior of rectangular beams strengthened by steel plate and concrete, the damage of the original beam is maintained while the initial load is applied to the composite beam.On the other hand, in order to solve the problem of debonding and failure in the reinforcement of sheet metal better, this experiment will put forward the composite strengthening of steel plate and concrete at the end of the composite steel plate and concrete on the basis of the steel plate and concrete composite flexural strengthening of the original beam.The feasibility of the method and its influence on debonding failure are verified by experiments.In the course of the test, the phenomena of the test beam from loading to failure are observed, and the bending capacity, deformation and strain results of the test beam are analyzed in detail.The stress condition and failure mechanism of rectangular beams strengthened with steel plate and concrete are revealed, and the validity of composite reinforcement is verified by comparing the theoretical calculation values.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446;U445.72

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