梁增大截面加固后框架结构的受力性能研究

发布时间：2018-04-17 07:44

本文选题：增大截面法 + 框架梁柱节点　；参考：《西安科技大学》2015年硕士论文

【摘要】：随着社会的不断发展与进步,许多既有建筑无法满足当前的使用功能而需要进行加固改造。增大截面加固法是建筑加固改造行业中最常用的加固方法之一,但目前针对增大截面法加固后梁柱节点整体受力性能的研究还不够深入。加固改造梁柱节点受力复杂,是框架结构的重要受力构件。因此对加大截面法加固钢筋混凝土梁柱节点的受力性能研究具有非常重要的理论研究意义和工程应用价值。本课题在查阅相关资料的基础上,分析了增大截面法加固钢筋混凝土结构的工作机理,提出了增大截面法加固钢筋混凝土结构的改进技术措施。然后运用SAP2000有限元软件分别对原结构及第二、三、四层楼面梁增大截面后的框架结构进行了Pushover分析,通过结构在地震作用下达到性能点位置时的顶点位移、层间位移角等参量,验证了增大截面法加固框架梁的可行性。最后运用ABAQUS有限元软件分析了框架结构在低周往复荷载作用下梁、柱节点的受力性能。经分析研究,得出了以下主要结论:(1)在框架梁柱节点处设置附加植筋可提高梁、柱节点区的受力性能;(2)加大截面法加固梁的楼层位置越高,框架柱越容易出现塑性破坏;(3)各模型破坏时,梁端发生受弯破坏一般先于节点的剪切破坏,符合“强节点,弱截面”的设计要求。(4)梁增大截面加固后构件抗弯计算中的新增钢筋强度利用系数s?可取0.94。上述研究结果可供进一步研究增大截面法加固框架梁柱节点的受力性能,对同类型的工程设计和施工提供一定的参考价值。
[Abstract]:With the continuous development and progress of the society, many existing buildings can not meet the current use function and need to be reinforced.The reinforcement method of increasing section is one of the most commonly used reinforcement methods in the industry of building strengthening and reconstruction, but the research on the overall mechanical behavior of Liang Zhu joint after reinforcement with the method of increasing section is not deep enough at present.Liang Zhu joint is an important member of frame structure because of its complex force.Therefore, it is very important to study the mechanical behavior of reinforced concrete Liang Zhu joints strengthened by cross-section method in theory and engineering application.On the basis of consulting relevant data, this paper analyzes the working mechanism of reinforced concrete structure strengthened by increasing section method, and puts forward some technical measures for strengthening reinforced concrete structure by increasing section method.Then the SAP2000 finite element software is used to analyze the original structure and the second, third and four-story frame structure after the section is enlarged by Pushover. The parameters such as the displacement of the vertex and the angle of the displacement between the layers when the structure reaches the position of the performance point under the earthquake action are analyzed by Pushover.The feasibility of strengthening frame beam by increasing section method is verified.Finally, ABAQUS finite element software is used to analyze the behavior of beam and column joints under low cycle reciprocating loads.Through analysis and research, the following main conclusions are drawn: (1) setting additional reinforcement at the joint of frame Liang Zhu can improve the beam, and the stress behavior of column joint area is improved. The higher the floor position of the beam strengthened by the method of increasing cross-section is,The more prone to plastic failure of frame columns and the failure of each model, the shear failure at the end of beam usually occurs before the joint, which is in accordance with the "strong joint".The design requirement of weak section. 4) the strength utilization coefficient of the new steel bar in the calculation of the flexural strength of the reinforced members strengthened with the increased section s?Desirable 0.94.The above results can be used to further study the mechanical behavior of Liang Zhu joints strengthened by increasing cross-section method and provide some reference value for the same type of engineering design and construction.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU375

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