某钢筋混凝土框架结构火灾后检测鉴定与加固方法研究

发布时间：2018-02-12 09:59

本文关键词： 火灾钢筋混凝土框架结构检测鉴定加固　出处：《西安建筑科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：建筑火灾占各类火灾80%左右，我国年发生建筑火灾约3万起，造成的直接经济损失约10亿元。混凝土结构是我国现阶段运用最为广泛的一种结构形式，，在火灾作用下，混凝土结构的材料性能将发生一系列的变化，从而导致混凝土构件承载性能退化、结构安全性降低。火灾温度的判定、火灾后构件损伤程度的评估、结构可靠性水平的判断、加固对策的确定，是火灾后混凝土结构需要解决的几个关键科学问题。本文以山西省长治市金威超市火灾事故检测鉴定与维修加固为背景，对其火灾后混凝土结构火灾温度的判定、过火构件的检测鉴定评级以及维修加固方案展开了理论研究与工程实践分析，研究内容如下：（1）探讨了工程中常用的火灾温度判定方法的理论依据，并分析了各方法的优缺点；结合火灾工程实例，提出了适合该工程的火灾温度判定方法；（2）介绍了火灾后钢筋混凝土框架结构的主要检测方法及鉴定程序，对火灾后混凝土构件强度的检测方法进行了回顾，并分析其优缺点，结合火灾工程实例，采用钻芯法检测混凝土构件强度，数据精度高，且直观；（3）以山西省长治市金威超市火灾事故的检测鉴定为工程背景，对火灾后钢筋混凝土框架结构检测和鉴定评级方法进行了分析，提出了过火构件受损深度与范围、混凝土强度及钢筋力学性能检测鉴定方法；（4）介绍了混凝土结构常见的加固方法并分析了各方法的优缺点，结合金威超市火灾事故，研究了火灾后多层钢筋混凝土框架结构的修复与加固方法。
[Abstract]:Building fires account for about 80% of all kinds of fires, and there are about 30,000 building fires in China each year, resulting in direct economic losses of about 1 billion yuan. Concrete structure is the most widely used structural form in China at the present stage, under the action of fire. A series of changes will take place in the material properties of concrete structures, which will lead to the degradation of the bearing capacity of concrete members, the reduction of structural safety, the determination of fire temperature, the assessment of damage degree of members after fire, and the judgement of reliability level of structures. The determination of reinforcement measures is a key scientific problem to be solved for concrete structures after fire. In this paper, the fire temperature of concrete structure in Changzhi City, Shanxi Province, is determined with the background of fire accident detection, identification and maintenance and reinforcement of Jinwei supermarket in Changzhi City, Shanxi Province. The detection and appraisal rating of overfire components and the maintenance and reinforcement scheme are studied in theory and engineering practice. The contents of the research are as follows:. 1) the theoretical basis of the commonly used fire temperature judgment method in engineering is discussed, and the advantages and disadvantages of each method are analyzed, and the fire temperature judgement method suitable for the project is put forward in combination with the fire engineering example. This paper introduces the main detection methods and appraisal procedures of reinforced concrete frame structure after fire, reviews the testing methods of strength of concrete members after fire, analyzes its advantages and disadvantages, and combines with fire engineering examples. The method of drill core is used to measure the strength of concrete members, which has high precision and intuition. Based on the engineering background of fire accident detection and identification of Jinwei supermarket in Changzhi City, Shanxi Province, this paper analyzes the detection and appraisal rating method of reinforced concrete frame structure after fire, and puts forward the damage depth and scope of overfire members. Test method for strength of concrete and mechanical properties of steel bars; This paper introduces the common reinforcement methods of concrete structure and analyzes the advantages and disadvantages of each method. Combined with the fire accident in Jinwei supermarket, the repairing and strengthening methods of multi-story reinforced concrete frame structure after fire are studied.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU375.4;TU746.3

【共引文献】