【作者】 钟长红；

【导师】 常晓林；

【作者基本信息】 武汉大学 ， 水工结构工程， 2004， 硕士

【摘要】 水库溢洪道钢筋混凝土闸墩出现裂缝的现象普遍存在。闸墩裂缝的产生和发展往往是由于多种原因的综合效应，也有可能由某一种原因就能产生裂缝，其中最值得注意的是温度作用产生的裂缝。长期以来，一直认为闸墩的温度应力不大，故一般不要求进行温度应力分析计算。但在实际工程中，常发现闸墩中部产生由底部向上延伸的竖向贯穿性裂缝。因此对闸墩进行温度应力分析是十分必要的。 本文依托于某实际工程，综合运用有限元基本理论，用ANSYS软件对陆水蒲圻水利枢纽闸墩裂缝成因问题进行了较为深入的研究，查找该工程闸墩裂缝出现的原因。并根据裂缝成因，提出了防止裂缝继续发展的工程解决方案。本文共分七章，下面具体地总结一下本文的主要内容： (1) 首先从混凝土结构的物理性能和热传导的基本概念出发，综合论述了混凝土结构产生温度应力的原因。 (2) 根据研究目的的不同，建立了该工程的四种混凝土结构有限元模型。首先在不考虑温度荷载的情况下，对闸墩进行结构计算，探求裂缝出现的原因。 (3) 考虑月温度变化对运行期闸墩应力的影响，对结构进行三维有限元的温度仿真，在多种工况下分析了该工程混凝土结构在考虑温度荷载作用下的应力情况。 (4) 分析目前闸墩的受力情况，判断了裂缝继续开展的可能性。 (5) 在明确裂缝成因及危害性的基础上，参考工程经验，提出三种加固方案：粘贴钢板方案，预应力锚索方案、连接原闸墩钢筋方案。利用有限元软件，对三种加固方案的加固效果进行了比较，结合施工难易程度、对原结构损伤情况等方面综合考虑，选择相对较好的加固方案。 (6) 通过综合比较后，选定粘钢方案为工程的加固方案，并在此方案的基础上进行了粘贴钢板长度对结构加固效果的敏感性分析，选出满足既加固效果又经济的优化方案。更多还原

【Abstract】 The phenomenon is ubiquitous that the concrete cracks appear in pier of RC structure. Causation and position of crack are complicated, so that it is a little difficult to analyze cracks of pier. The reasons of crack perhaps various, sometimes temperature is the primary factor. Once some people think that temperature stress is not enough great in pie and it can be ignored, in fact concrete cracks appear in pier is familiar, so that it is necessary to take temperature as important factor in cracks analysis.The paper is based on a practical engineering, including seven chapters. Focused on reasons of pier crack, this paper performed in-depth study and discussion with FEM theory and ANSYS software. Based on the reason of crack, three reinforcement projects are recommended to restrict development of crack. This paper’s study contents are as follows in detail:1) Above all on the basis of the primary concepts of thermal conduction and thermal physical property of concrete material, the causes resulting in temperature stress of the concrete structures are analyzed.2) Base on different analysis aims, four FEM model are set up. At first, without regard to temperature, calculate structure’s stress and look for the reason of crack.3) A compute model for the temperature stress of concrete structures is set up by ANSYS software,a concrete structure with temperature load is analyzed.4) After current state analysis of pier, make a judgment about possibility of crack sustained growing.5) Because of fatalness of crack, three reinforcement projects are recommended. Reinforcement project’s effects are compared and the best one is selected.6) Make a analysis about relation between the steel plate and reinforcement effect, reasonable and economical collocation of steel plate is adopted.更多还原