钢筋混凝土框架结构加固技术的研究与应用

发布时间：2018-11-14 21:03

【摘要】：本文研究的主要内容是既有建筑的可靠性鉴定及其加固技术。我国房屋建筑用地资源有限、原有建筑不满足目前的使用要求、地震灾害造成既有建筑存在安全隐患、偶然作用使得建筑部分构件出现损伤等等多重原因造成建筑物急需进行加固维修,促使近年来我国建筑加层、加固技术发展越来越快,对既有建筑进行加固施工已经成为政府部门及建筑行业广泛关注和研究的问题。影响建筑物加固的因素有很多,如建筑结构形式不一、施工难易程度不同、加固改造要求不同、后期使用条件不同等。对既有建筑结构进行加固,首先需要对其进行可靠性分析。既有建筑的可靠性分析建立在现有的结构服役信息的基础上,并据此推断出在建筑剩余服役期内结构的可靠性等。目前较为常用的既有建筑可靠性鉴定方法有：传统经验鉴定法、模糊评价法、实用鉴定法、概率论评价法、借助PKPM软件进行可靠性分析等。本文研究比较了几种常见鉴定技术的优缺点及其适用范围,通过分析两个实际的工程项目,对常见的几种建筑可靠性鉴定技术和PKPM软件鉴定技术进行比较,证明运用计算机软件进行既有建筑的可靠性鉴定比其他几种鉴定方法可操作性强,PKPM软件比其他几种常用可靠性鉴定技术能更快速、科学的对建筑物进行可靠性分析、鉴定。既有建筑结构的加固有着不同于新建建筑的特殊性：施工现场狭小、施工受到局限、新旧建筑结合处施工工艺要求高等。目前我国使用较多的加固技术主要有增大截面加固法、外贴型钢加固法、粘贴碳纤维复合材料加固法、钢丝网复合砂浆加固法、钢筋网砂浆加固法、钢筋钢丝网复合砂浆加固法、外套钢框加固法等,这几种常用的加固技术各有优缺点。本文分析研究了几种常用加固技术的特点及其适用范围,并通过分析某钢筋混凝土柱构件加固案例,比较了钢筋钢丝网符合砂浆加固技术和套箍加固技术的施工工艺、承载力提高能力,还借助了广联达计算软件方法比较两种加固技术加固钢筋混凝土柱构件的造价,在承载力和刚度方面的提高及造价几方面证明了钢筋钢丝网复合砂浆加固技术加固柱构件不仅比其他常用加固方法更加合理高效,而且更加经济,具有推广使用的实际意义。本文还通过分析某一食堂加层加固案例,比较几种目前常用的加层方式后得出外套钢架加固混凝土结构在某些特殊加固工程中应用具有其优越性的结论,证明外套钢架的加固技术具有实际推广意义。
[Abstract]:The main content of this paper is the reliability appraisal and reinforcement technology of existing buildings. Because of the limited land resources for housing construction in our country, the original buildings do not meet the current requirements for use, and the existing buildings have hidden dangers caused by earthquake disasters. Accidental action causes the damage of some parts of the building and many other reasons, resulting in the urgent need for strengthening and maintenance of the building. In recent years, the reinforcement technology is developing more and more rapidly. Reinforcement of existing buildings has become a widespread concern and research of government departments and construction industry. There are many factors that influence the reinforcement of buildings, such as the different forms of building structures, the different degree of construction difficulty, the different requirements of reinforcement and reconstruction, and the different conditions of later use. To reinforce the existing building structure, it is necessary to analyze its reliability first. The reliability analysis of the existing buildings is based on the existing service information of the structures and the reliability of the structures during the remaining service periods of the buildings is inferred. At present, the commonly used methods for reliability appraisal of existing buildings are: traditional empirical appraisal method, fuzzy evaluation method, practical appraisal method, probability theory evaluation method, reliability analysis with PKPM software, etc. This paper studies and compares the advantages and disadvantages of several common identification techniques and their scope of application. Through the analysis of two practical engineering projects, this paper compares several common building reliability identification techniques with PKPM software identification techniques. It is proved that using computer software to identify the reliability of existing buildings is more operable than other identification methods, and that PKPM software can be used to analyze and identify the reliability of buildings more quickly than other commonly used reliability identification techniques. The reinforcement of the existing building structure is different from that of the new building: the construction site is small, the construction is limited, and the construction technology of the new and old buildings is high. At present, more and more reinforcement techniques are used in our country, such as reinforcement of enlarged section, reinforcement of external steel, reinforcement of carbon fiber composite material, reinforcement of steel wire mesh composite mortar, reinforcement of reinforced concrete mesh mortar, reinforcement of steel wire mesh mortar, The reinforcement method of steel wire mesh composite mortar and the reinforcement method of overburden steel frame have their own advantages and disadvantages. In this paper, the characteristics and applicable range of several commonly used reinforcement techniques are analyzed and studied. By analyzing a case of reinforcement of reinforced concrete column members, the construction technology of reinforced steel wire mesh in accordance with mortar reinforcement technology and hoop reinforcement technology is compared. In order to improve the capacity, the cost of strengthening reinforced concrete column members with two kinds of reinforcement techniques is compared by means of the Guanglianda calculation software method. The improvement of bearing capacity and stiffness and the cost of strengthening column members with steel wire mesh composite mortar not only are more reasonable and efficient than other commonly used reinforcement methods, but also more economical, and have practical significance of popularizing and using. By analyzing the case of adding layer in a canteen, this paper compares several commonly used ways of adding layer, and draws the conclusion that the application of overcoat steel frame to reinforce concrete structure in some special reinforcement projects has its superiority. It is proved that the reinforcement technology of overcoat steel frame has practical popularization significance.
【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU375.4

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