武汉钢铁工业区混凝土结构耐久性环境区划研究

发布时间：2018-01-03 10:06

本文关键词：武汉钢铁工业区混凝土结构耐久性环境区划研究　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】：由于工业建筑所处的工作环境因生产工艺要求差别很大，与民用建筑相比，工业建筑混凝土结构的耐久性失效类型和损伤原因更加复杂，结构耐久性损伤的工艺区域特征更加明显。因此，研究不同工艺流程中环境条件差异对混凝土结构耐久性的影响，，进行工业建筑混凝土结构耐久性环境区划，对保证工业建筑混凝土结构的安全使用和维护管理具有重要的实际意义。钢铁工业环境下，混凝土结构耐久性破坏的主要原因是酸性气体侵蚀引起的钢筋锈蚀。本文以武汉钢铁工业区为背景，调查了工业区的工艺流程，分析了主要工艺流程中的环境参数，将武汉钢铁工业区分为焦化、冶炼、炼钢及轧钢四个工艺区，并对各工艺区的混凝土结构耐久性现状进行了初步调查。以武汉钢铁工业区焦化厂硫铵车间和第二炼钢厂为重点研究对象，对厂房的环境温度、相对湿度、酸性气体浓度等环境参数进行了监测，对混凝土结构表观损伤、混凝土强度、保护层厚度及碳化深度进行了现场检测。检测结果表明：厂房结构的耐久性问题较为严重，混凝土表面普遍存在起皮、剥落现象，部分排架柱碳化深度较大，钢筋腐蚀较为严重。从SO2气体侵蚀和混凝土碳化两种耐久性劣化机理出发，以武汉钢铁工业区主要工艺流程的环境参数为基础，分别采用BP神经网络法确定了SO2气体侵蚀作用下混凝土结构的耐久性损伤程度；采用基于蒙特卡罗的可靠度寿命预测法确定了混凝土碳化作用下结构的耐久性损伤程度。综合分析了两种劣化机理作用下结构的损伤程度，对武汉钢铁工业区混凝土结构进行了耐久性环境区划，得到了武汉钢铁工业区混凝土结构的耐久性环境区划图。结合区划图中各分区的环境特点及混凝土构件的重要性等级，提出了相应分区的混凝土结构耐久性设计及维护建议。
[Abstract]:As the working environment of industrial buildings varies greatly due to the requirements of production technology, the durability failure types and damage causes of concrete structures of industrial buildings are more complex than those of civil buildings. Therefore, the effects of different environmental conditions on the durability of concrete structures in different technological processes are studied, and the environmental regionalization of durability of concrete structures of industrial buildings is carried out. It has important practical significance to ensure the safe use and maintenance management of industrial building concrete structure. Under the environment of iron and steel industry, the main reason of durability damage of concrete structure is the corrosion of steel bar caused by acid gas erosion. This paper investigates the technological process of Wuhan Iron and Steel Industrial Zone. The environmental parameters in the main technological process are analyzed and the Wuhan iron and steel industry is divided into four processing areas: coking, smelting, steelmaking and rolling. The durability of concrete structures in each process area is investigated preliminarily. The environmental parameters such as environmental temperature, relative humidity, acid gas concentration and so on were monitored in the ammonium sulphate workshop and the second steelmaking plant in Wuhan Iron and Steel Industrial Zone. The apparent damage, strength, thickness and carbonation depth of concrete structures were tested on the spot. The results show that the durability of the factory buildings is serious, and the concrete surface is generally peeled. Spalling phenomenon, partial bent column carbonization depth is bigger, steel bar corrosion is more serious. Based on the two durability deterioration mechanisms of SO2 gas erosion and concrete carbonization, the environmental parameters of the main technological process in Wuhan Iron and Steel Industrial Zone are taken as the basis. The durability damage degree of concrete structure under the action of SO2 gas erosion is determined by BP neural network method. The reliability life prediction method based on Monte Carlo is used to determine the durability damage degree of the structure under concrete carbonization. The damage degree of the structure under the action of two deterioration mechanisms is analyzed synthetically. The durability environment zoning of concrete structure in Wuhan Iron and Steel Industrial Zone is carried out. The durability environmental zoning map of concrete structure in Wuhan Iron and Steel Industrial Zone was obtained, which combined with the environmental characteristics of each district and the importance grade of concrete members in the zoning map. Suggestions for durability design and maintenance of concrete structures are put forward.
【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

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