CFRP加固偏压钢管柱平面内稳定性研究

发布时间：2019-03-19 20:00

【摘要】：钢结构在长期使用阶段因锈蚀、疲劳或超载等原因会引起损伤累积而影响结构的安全。如何加固修复损伤钢结构、提升既有结构性能一直是土木工程领域研究的一项重要课题。碳纤维复合材料(CFRP)加固钢结构技术作为一种具有独特优势的加固方法,近年来成为国内外学者研究的热点。目前,虽然国内外学者对CFRP加固轴心受压钢柱承载力有一定的研究,但对考虑偏心受压的压弯构件稳定性研究较少。针对己有研究存在的不足,对加固偏心受压钢柱的平面内稳定性研究是非常有必要的。本文所做的研究工作及其成果如下:(1)开展了CFRP加固偏压方钢管、圆钢管试验,研究考虑偏心距、CFRP层数和钢管截面形式对加固钢管柱整体稳定性能的影响。试验结果表明中长长细比钢管构件破坏模式为构件柱中央截面受压侧首先出现屈服导致的弯矩作用平面内整体失稳破坏;随着粘贴CFRP层数的增加,加固试件的稳定承载力会有很一定程度的提高。粘贴相同层数CFRP的钢管柱随着偏心距的增加,极限承载力减小;相同构造条件下,粘贴CFRP加固圆钢管效果比方钢管相对好一些。(2)采用ANSYS软件建立了“壳-弹簧-壳”的有限元计算模型,将试验结果和计算模拟结果进行对比,验证了所建有限元模型的有效性。(3)对CFRP加固偏心受压方钢管柱和圆钢管柱的稳定性进行数值模拟分析,对比分析了CFRP层数、构件长细比、加载偏心距等参数对CFRP加固偏心受压钢管柱稳定性的影响程度。(4)对考虑在不同初始应力下CFRP加固偏心受压钢管柱进行了参数分析,研究初始应力对加固偏压钢管柱稳定性能的影响。本课题为新编国家标准《钢结构加固设计规范》资助课题,本文的研究成果可为标准编制和工程应用提供理论与试验依据。
[Abstract]:Corrosion, fatigue or overloading will cause damage accumulation in steel structures during long-term service, which will affect the safety of steel structures. How to strengthen and repair damaged steel structures and improve the performance of existing structures has always been an important topic in the field of civil engineering. As a unique method of strengthening steel structure reinforced with carbon fiber reinforced polymer (CFRP), in recent years, it has become a hot research topic both at home and abroad. At present, although scholars at home and abroad have a certain amount of research on bearing capacity of axial compression steel columns strengthened by CFRP, there is little research on the stability of compression and bending members considering eccentric compression. It is necessary to study the in-plane stability of eccentrically compressed steel columns. The research work and achievements of this paper are as follows: (1) CFRP strengthened square steel pipe and circular steel pipe test are carried out. The effects of eccentricity, CFRP layer number and steel pipe section form on the overall stability of reinforced steel pipe columns are studied. The experimental results show that the failure mode of steel tube members with medium to long slenderness ratio is that the buckling failure occurs first on the compression side of the central section of the member column, which is caused by the bending moment in the plane. With the increase of the number of CFRP layers, the stability bearing capacity of the reinforced specimens will be improved to a certain extent. With the increase of eccentricity, the ultimate bearing capacity of steel string pasted with the same number of CFRP decreases with the increase of eccentricity. Under the same construction conditions, the effect of strengthening circular steel pipe with CFRP is better than that of steel pipe. (2) the finite element model of "shell-spring-shell" is established by using ANSYS software, and the experimental results are compared with the results of calculation simulation. The validity of the finite element model is verified. (3) the stability of eccentrically compressed square steel tube column and circular steel tube column strengthened by CFRP is numerically simulated and analyzed, and the number of CFRP layers and the slenderness ratio of members are compared and analyzed. The influence of loading eccentricity and other parameters on the stability of eccentrically compressed steel tube columns strengthened by CFRP is studied. (4) the parameters of eccentrically compressed steel tube columns strengthened by CFRP under different initial stresses are analyzed. The effect of initial stress on the stability of steel tube columns strengthened by bias is studied. The research results of this paper can provide the theoretical and experimental basis for the compilation and engineering application of the new national standard code for steel structure reinforcement design. The research results of this paper can provide theoretical and experimental basis for the compilation of the standard and the engineering application.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU392.3

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