某混凝土框架结构火灾后的安全性鉴定与加固设计研究

发布时间：2018-01-03 00:22

本文关键词：某混凝土框架结构火灾后的安全性鉴定与加固设计研究　出处：《长沙理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：火灾是联合国公布的二十世纪除战争之外全球十项最具危害性的灾害之一。进入二十一世纪以来,建筑物火灾呈现出多发趋势。建筑物一旦发生火灾,不仅给人们带来巨大的经济损失,而且直接威胁人们的生命安全。目前,国内外关于火灾后混凝土结构的材料性能、结构检测、结构加固和修复虽已进行了大量卓有成效的研究,但仍未形成完整的理论体系和成熟的应用技术,在实际工程中,仍有许多亟待解决的问题。本文以某混凝土框架结构火灾后的检测、鉴定和加固设计为背景,对火灾后混凝土结构现场检测、鉴定及加固设计等进行了深入的研究和探讨,通过对火灾后混凝土材料的力学性能和构件截面尺寸进行合理折减,提出了适合本工程受损构件剩余承载力的计算方法,以其能为类似工程的检测、鉴定及加固提供一些参考。首先,对火灾现场过火范围、残留物和构件损伤程度进行调查,运用多种方法综合确定过火范围内构件表面曾经达到的温度值,依据现有的火灾检测鉴定规范和现场调查结果对受损构件进行初步鉴定评级。其次,对构件进行截面尺寸、变形、材料强度、钢筋配置、保护层厚度、混凝土中性化等进行了检测分析;总结前人对高温后钢筋混凝土的力学性能的研究成果,并结合材料取样试验结果确定了本工程火灾后钢筋和混凝土材料强度的折减系数。再次,依据本文提出的剩余承载力计算方法对受损严重的混凝土构件进行承载力计算,并以此对受损严重的混凝土构件进行详细鉴定评级和安全性评级,通过多层次的鉴定评级综合确定火灾后混凝土框架结构的安全性等级。最后,根据本工程的受损情况确定经济合理的加固方案,并选取了受损严重的构件作为典型构件进行加固计算,绘制了加固设计示意图。
[Abstract]:Fire is one of the ten most harmful disasters in the world except for the war in 20th century. Since 21th century, the fire in buildings has shown a tendency of frequent. Once fire broke out in buildings. Not only bring huge economic losses to people, but also directly threaten the safety of people. At present, the material performance and structure testing of concrete structures after fire have been studied both at home and abroad. Although a large number of fruitful research has been carried out on the reinforcement and restoration of structures, it has not yet formed a complete theoretical system and mature application technology in practical engineering. There are still many problems to be solved. Based on the detection, appraisal and reinforcement design of a concrete frame structure after fire, the field detection of concrete structure after fire has been carried out in this paper. The identification and reinforcement design are studied and discussed. The mechanical properties of concrete materials and the section size of the members are reduced reasonably after the fire. This paper puts forward a calculation method suitable for the residual bearing capacity of damaged members in this project, which can provide some references for the detection, appraisal and reinforcement of similar projects. The residual materials and the damage degree of the components were investigated, and the temperature values of the components surface in the overfire range were determined by a variety of methods. According to the existing fire detection and identification criteria and site survey results, the damaged members are preliminarily rated. Secondly, the section size, deformation, material strength, steel bar configuration, thickness of the protective layer are carried out. The neutralization of concrete is tested and analyzed. Summarize the previous research results on the mechanical properties of reinforced concrete after high temperature, and combined with the results of material sampling test to determine the strength reduction coefficient of steel bar and concrete material after fire. Again. According to the calculation method of residual bearing capacity proposed in this paper, the bearing capacity of severely damaged concrete members is calculated, and the detailed appraisal rating and safety rating of seriously damaged concrete members are carried out. The safety grade of concrete frame structure after fire is determined by multi-level appraisal rating. Finally, the economical and reasonable reinforcement scheme is determined according to the damage of the project. And select the severely damaged member as the typical member to carry on the reinforcement calculation, draw the reinforcement design diagram.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU37;TU352.5

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