锚贴钢板加固锈蚀RC梁的试验研究和承载力分析

发布时间：2018-04-28 01:41

本文选题：锚贴钢板 + 锈蚀钢筋混凝土梁　；参考：《长沙理工大学》2014年硕士论文

【摘要】：如今,我国有大量的在役桥梁在各种环境因素及荷载作用的影响下,出现了不同程度的病害,不能满足其服役安全的要求,亟需对其进行维修与加固。因此,研究桥梁加固后的承载能力退化规律,对于指导实桥的维修加固,研究桥梁维修、加固以及改造技术具有重要的现实意义。论文在国家自然科学基金项目[51178060]和交通部应用基础项目(主干学科)[2014319825160]的资助下,主要开展的工作内容如下：1)本次试验设计了12片钢筋混凝土梁,考虑了保护层厚度、砼强度以及锈蚀率等影响,制定了加固方案,使用底部锚贴加固钢板的方法对锈蚀梁进行加固处理；再采用人工通电加速腐蚀的方法对梁进行锈蚀；设计了加载方案对试验梁进行单点加载,对试验过程中的各种数据及现象进行了记录。2)分析了锚贴钢板加固对梁各方面力学性能的影响,对加固梁的抗弯承载力、挠度变化、应力应变以及破坏形式等方面数据进行了对比分析。并通过对加固与未加固的钢筋混凝土梁抗弯承载力的理论计算与分析,得出了与试验数据拟合较好的承载力公式,可以为工程实际提供参考。3)基于试验的结果,并结合了一个工程实例,计算了钢筋混凝土结构的随时间变化的可靠度指标,对可靠指标的劣化曲线进行了模拟。分析了其维修加固的时机的概率分布规律,得出结果与实际拟合较好,具有一定的实践指导意义。
[Abstract]:Nowadays, under the influence of various environmental factors and loads, a large number of in-service bridges in our country have appeared different degrees of disease, which can not meet the requirements of service safety, so it is urgent to repair and reinforce them. Therefore, it is of great practical significance to study the degradation law of the bearing capacity of the strengthened bridge for guiding the maintenance and strengthening of the real bridge and for studying the maintenance, strengthening and rebuilding technology of the bridge. Supported by the National Natural Science Foundation of China [51178060] and the Ministry of Communications Applied Foundation Project [2014319825160], the main work of this paper is as follows: (1) in this experiment, 12 reinforced concrete beams have been designed, and the thickness of the protective layer has been taken into account. Under the influence of concrete strength and corrosion rate, the reinforcement scheme was established, and the method of strengthening the steel plate with the bottom anchor was used to strengthen the corroded beam, and then the method of artificial electrification accelerated corrosion was used to corrode the beam. The loading scheme is designed to carry out single point loading on the test beam. The data and phenomena during the test are recorded. 2) the influence of anchoring steel plate reinforcement on the mechanical properties of the beam is analyzed, and the flexural bearing capacity and deflection change of the strengthened beam are analyzed. The data of stress strain and failure form are compared and analyzed. Based on the theoretical calculation and analysis of the flexural capacity of reinforced concrete beams strengthened and unstrengthened, a better bearing capacity formula fitting with the experimental data is obtained, which can provide a reference for engineering practice. 3) based on the test results, Combined with an engineering example, the reliability index of reinforced concrete structure varying with time is calculated, and the deterioration curve of reliability index is simulated. The probability distribution law of the opportunity of maintenance and reinforcement is analyzed, and the result is well fitted with the actual situation, which has certain practical significance.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU375.1

【共引文献】