砌体的化学植筋后锚固受拉试验研究

发布时间：2018-04-01 04:39

本文选题：砌体　切入点：植筋　出处：《湖南大学》2015年硕士论文

【摘要】：近些年,由于建筑工程中日益增多的建筑翻新、建筑改扩建以及大量新建工程施工的需要,后锚固技术的研究及应用的重要性日益彰显。后锚固连接是设备安装、结构改造和加固中较常用的连接方式,它通过锚栓或植筋使新增构件与原有构件有效连接,并传递荷载。在我国,虽然后锚固研究起步较晚,但近年来其应用范围较广泛。中国建筑工业出版社出版的《混凝土结构后锚固技术规程》(JGJ145-2013)全面系统地介绍了后锚固技术。但《混凝土结构后锚固技术规程》针对的基材为混凝土,而现在广泛使用的砌体结构的后锚固技术并没有一个系统完善的设计理论。应《砌体结构后锚固技术规程》编撰的需要,为在砌体基材上的后锚固技术提供指导,本文通过在蒸压粉煤灰砖、蒸压灰砂砖、烧结普通砖砌体上的后锚固化学植筋在静力作用下的拉拔试验研究,分析了砌体上后锚固的破坏模式和影响拉拔承载力的因素,并利用ABAQUS有限元分析软件对植筋拉拔试验进行数值模拟。本文主要工作如下:1.对以蒸压粉煤灰砖和蒸压灰砂砖砌体为基材的植筋试件,研究钢筋外形、钢筋直径、基材种类对拉拔承载力的影响,测量钢筋应变、植筋试件加载端的滑移量,绘制荷载-滑移曲线,分析植筋的滑移特点。2.对以烧结普通砖砌体为基材的植筋试件,研究植入位置、钢筋外形、钢筋直径、锚固深度对拉拔承载力的影响,测量植筋试件加载端的滑移量,绘制荷载-滑移曲线,分析植筋的滑移特点。3.根据砖砌体、钢筋和锚固胶的特点及其粘结滑移关系,运用ABAQ US有限元分析软件对植筋拉拔试验进行数值分析。并与试验结果对比,验证了有限元模型的可行性。本文在对化学植筋后锚固技术性能在国内外的发展和应用作了大量调查研究的基础之上,通过试验研究及数值分析,对植筋的破坏形态、承载力和滑移性能做了初步剖析。在保证施工质量的前提下,在砖砌体上锚固深度为10d~14d的化学植筋后锚固具有一定承载力,增大钢筋直径、锚固深度或基材强度可以提高植筋极限拉拔承载力,其破坏形式为脆性破坏,不适用于重要承重构件,但可用于一般的附属构件(如挂件等)。
[Abstract]:In recent years, the importance of the research and application of post-anchoring technology is becoming more and more obvious because of the increasing number of building renovation, building reconstruction and extension, and a large number of new construction projects. The post-anchoring connection is the installation of equipment. The more commonly used connection method in structural reconstruction and reinforcement is that the new members are effectively connected with the original members through anchor bolt or reinforcement, and the load is transferred. In our country, although the post-anchoring research started late, In recent years, however, it has been widely used. JGJ145-2013, published by China Construction Industry Publishing House, introduces the post-anchoring technology in a comprehensive and systematic way. But the "Technical Specification for Post-Anchorage of concrete structures" aims at. The base material is concrete, However, there is no systematic and perfect design theory for the post-anchoring technology of masonry structure, which is widely used now. It is necessary to compile the "Technical Specification for Post-Anchorage of masonry structure" to provide guidance for the post-anchoring technology on the masonry base material. This paper analyzes the failure mode of post-anchoring on the autoclaved pulverized coal brick, autoclaved lime-sand brick and sintered ordinary brick masonry under static force, and analyzes the factors influencing the drawing capacity. The main work of this paper is as follows: 1. The main work of this paper is as follows: 1. The steel bar shape and the diameter of steel bar are studied by using autoclaved fly ash brick and autoclaved lime sand brick masonry as the base material. The effect of the type of base material on the drawing capacity, measuring the strain of steel bar, the slip amount at the loading end of the steel bar specimen, drawing the load-slip curve, analyzing the slip characteristics of the steel bar, and analyzing the slip characteristics of the steel bar. 2. For the sintered ordinary brick masonry as the base material, the sintered steel bar specimen, The influence of placement position, shape of steel bar, diameter of steel bar and depth of anchoring on the bearing capacity of tensile drawing is studied. The slip amount at the loading end of the specimen is measured, the load-slip curve is drawn, and the slippage characteristics of the steel bar are analyzed. 3. According to the brick masonry, The characteristics of reinforcing bar and anchoring glue and their bond-slip relationship are analyzed numerically by using ABAQ US finite element analysis software, and the results are compared with the test results. The feasibility of the finite element model is verified. On the basis of a large number of investigations and studies on the development and application of the anchoring technology after chemical reinforcement planting at home and abroad, the failure pattern of the rebar is analyzed by means of experimental research and numerical analysis. The bearing capacity and slippage properties are analyzed preliminarily. On the premise of ensuring the construction quality, the anchoring of the chemical reinforcement with the depth of 10d~14d on the brick masonry has a certain bearing capacity and increases the diameter of the steel bar. Anchoring depth or base material strength can increase ultimate pull-out bearing capacity of steel tendons. The failure form is brittle failure, which is not suitable for important load-bearing members, but can be used in general auxiliary members (such as pendants, etc.).
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU364

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