防屈曲耗能支撑加固既有建筑的抗震性能研究与分析

发布时间：2018-11-08 18:37

【摘要】：汶川地震以来国家提高了中小学校抗震设防水准,为此全国大部分既有中小学校校舍需抗震加固。防屈曲耗能支撑是一种特殊的中心支撑,是中心支撑和金属屈服型耗能器的结合体,可应用于钢结构、钢筋混凝土结构及钢筋混凝土框架结构的新建和加固中。防屈曲耗能支撑相对普通支撑具有更饱满的滞回曲线,且受拉受压均能屈服,工艺简单可操作性强。应用于抗震加固领域可以大大缩短施工工期,减小加固工作量,节约费用。在地震过程中防屈曲约束支撑在弹性阶段提供抗侧刚度,在弹塑性阶段作为第一道防线首先耗能有效减小结构构件损伤,保护主体结构,使结构整体抗震性能得以提高。本文对云南省玉溪市第一中学星华教学楼加固试点工程的检测、抗震鉴定和加固设计进行分析,并对加固后校舍的抗震性能进行深入的研究,对该试点工程进行弹塑性分析,使结构满足规范要求。研究内容如下： 1、讲述了课题研究的背景、来源、目的及意义,对抗震检测、鉴定与加固的现状进行分析和总结,并介绍了防屈曲约束支撑的概况。 2、以玉溪一中星华楼为工程背景,对钢筋混凝土框架结构校舍进行结构检测与评价。包括：(1)采用回弹法检测强度,推算出钢筋混凝土强度等级；(2)构件截面尺寸检测；(3)抗震构造措施检测；(4)对检测结果做出评价。 3、根据检测数据,对校舍进行两级抗震鉴定。包括：(1)安全性和正常使用性鉴定；用PKPM软件建模,并对抗震承载力进行验算；(2)一级抗震措施鉴定：包括结构体系、结构材料、实际强度、结构构件的纵向钢筋和横向箍筋的配置、构件连接的可靠性、填充墙等与主体结构的拉接构造等内容的鉴定；(3)用PKPM软件对构件进行二级抗震承载力验算,最后得出抗震鉴定结论。 4、对校舍进行抗震加固设计。分析卸荷法、增大截面法、外包钢法、碳纤维加固法、增设剪力墙法、消能减震法、隔震加固法等加固方法的特点,确定本工程的加固方案,并对加固后构件进行承载力、位移和变形验算。 5、对加固后校舍进行弹塑性分析。阐述结构抗震性能分析方法,对加固后校舍进行抗震性能分析,包括：(1)在罕遇地震情况下,采用静力弹塑性分析方法(Push-over法)对加固后校舍进行弹塑性分析；(2)在罕遇地震情况下,采用动力弹塑性分析法对加固后校舍进行弹塑性分析；(3)分析结构构件实现抗震性能要求的指标。 6、对建筑结构加固前后的抗震性能进行对比。包括：(1)校舍加固前后动力特性测试对比；(2)采用PKPM软件对校舍加固前后的模型进行计算分析,对主要控制指标进行对比；(3)采用动力弹塑性分析法对校舍加固前后的抗震性能进行对比。
[Abstract]:Since the Wenchuan earthquake, the state has raised the level of earthquake resistance of primary and secondary schools, so most of the existing primary and secondary schools in the country need seismic reinforcement. Anti-buckling energy dissipation bracing is a special kind of central support, which is the combination of central support and metal yield energy dissipation device. It can be used in the construction and reinforcement of steel structure, reinforced concrete structure and reinforced concrete frame structure. The anti-buckling energy dissipation brace has a more full hysteretic curve than the common bracing, and can yield under tension and compression, and the process is simple and operable. The application in the field of seismic reinforcement can greatly shorten the construction period, reduce the amount of work and save the cost. Buckling restrained braces provide lateral stiffness in the elastic stage. As the first line of defense in the elastic-plastic stage, the first energy dissipation can effectively reduce the damage of the structural members and protect the main structure, so that the overall seismic performance of the structure can be improved. In this paper, the testing, seismic identification and strengthening design of Xinghua teaching building in No. 1 middle school of Yuxi City, Yunnan Province are analyzed, and the aseismic performance of reinforced school buildings is deeply studied, and the elastoplastic analysis of the pilot project is carried out. Make the structure meet the specification requirements. The research contents are as follows: 1. The background, source, purpose and significance of the research are described. The current situation of seismic detection, identification and reinforcement is analyzed and summarized, and the general situation of buckle-restrained braces is introduced. 2. The reinforced concrete frame structure school building is tested and evaluated with the background of Yuxi Zhongxing Hua building. It includes: (1) using springback method to detect the strength of reinforced concrete; (2) detecting the section size of the members; (3) detecting the seismic structure; (4) evaluating the test results. 3. According to the test data, the two-level seismic identification of the school building is carried out. The main contents are as follows: (1) Identification of safety and serviceability, modeling with PKPM software, and checking calculation of seismic bearing capacity; (2) Appraisal of first-grade seismic measures, including structural system, structural material, actual strength, configuration of longitudinal reinforcement and transverse stirrups of structural members, reliability of connection of members, tensile structure of filled walls and so on; (3) the second grade seismic bearing capacity of the components is checked by PKPM software, and finally the conclusion of seismic identification is obtained. 4. Seismic reinforcement design of the school building. This paper analyzes the characteristics of the strengthening methods, such as unloading method, increasing cross-section method, external steel method, carbon fiber strengthening method, adding shear wall method, energy dissipation method, isolation strengthening method, and so on, determines the strengthening scheme of the project, and carries on the bearing capacity of the strengthened members. Check calculation of displacement and deformation. 5. The elastoplastic analysis of reinforced school buildings is carried out. The aseismic performance analysis method of reinforced school buildings is described, including: (1) static elastoplastic analysis (Push-over method) is used to analyze the reinforced school buildings under rare earthquake; (2) under rare earthquake, dynamic elastoplastic analysis method is used to analyze the reinforced school buildings, and (3) to analyze the index of structural members' achievement of seismic performance requirements. 6. The seismic behavior of building structure before and after strengthening is compared. The main contents are as follows: (1) the dynamic characteristics of the school before and after reinforcement are compared; (2) the model before and after reinforcement is calculated and analyzed by PKPM software, and the main control indexes are compared. (3) dynamic elastoplastic analysis method is used to compare the seismic behavior of school buildings before and after reinforcement.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU352.11

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