FRP-钢管混凝土复合柱轴压承载力计算方法及轴压性能研究

发布时间：2018-01-09 13:01

本文关键词：FRP-钢管混凝土复合柱轴压承载力计算方法及轴压性能研究　出处：《北方工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：FRP-钢管混凝土复合柱是在钢管混凝土柱外表面黏贴FRP(复合纤维塑料)布而形成的新型复合结构。FRP-钢管混凝土复合柱充分利用了钢管及外包的FRP布对其内部核心混凝土的约束作用从而具备了较高的承载力,因此可作为重载柱应用在高层、超高层、大跨度桥梁结构中。此外,由于具备强质比高、耐腐蚀、耐久、施工工艺简单等特点,FRP还可作为加固材料黏贴在已有受损的钢管混凝土柱表面,从而延长钢管混凝土结构的使用寿命。本文深入研究并探讨了两种截面形状的复合短柱的轴压极限承载力计算方法及轴压性能,具体采用的研究手段及完成的工作包括:(1)结合已有的试验现象与分析,采用一系列合理的假设,推导了以侧压力为基本参量的FRP-圆钢管混凝土复合短柱和FRP-方钢管混凝土复合短柱的轴压极限承载力统一计算式,该统一计算式程序简洁、物理意义明确,比现有其他计算式适用性更强。通过将统一式计算结果与各文献共计61组试验数据的对比可知,本文的统一计算式计算结果与试验值吻合较好,可为复合柱设计和理论分析提供可靠依据。(2)在ABAQUS软件中,建立了 FRP-圆钢管混凝土复合短柱和FRP-方钢管混凝土复合短柱的轴压有限元计算模型,对比了模型与相关献中对应试件的极限承载力、轴压全过程荷载-位移曲线及破坏模式,结果表明:文中建立的模型可以模拟出与试验相符的钢管鼓屈变形及FRP的断裂分布情况,同时模型轴压全过程荷载-位移曲线及极限承载力与18组试验结果吻合良好,从而说明本文提出的建模方法可用于评估和分析FRP-钢管混凝土复合短柱的轴压性能。(3)采用上述建模方法,建立了 78组不同参数的复合柱试件,系统地研究了 FRP层数、FRP种类、混凝土强度、钢管屈服强度以及钢管厚度对复合柱轴压性能的影响;其次,选择典型圆柱和方柱试件进行轴压全过程中各组成部分的应力变化规律分析,进一步掌握了两种复合柱轴压性能机理与性能;最后,结合有限元分析及已有的试验成果,提出了轴压圆柱和方柱受力全过程的荷载-位移曲线四阶段简化模型,并阐述了各阶段复合柱的受力机理,可为今后进一步对复合柱结构进行弹塑性分析提供参考。
[Abstract]:Concrete composite column is FRP- steel in steel pipe concrete column outer surface adhesive FRP (fiber composite plastic cloth) and the formation of new concrete composite structure of.FRP- steel tube composite column to make full use of the constraint effect of steel and outsourcing FRP cloth of the inner core concrete which has high bearing capacity, so it can be used in the application of heavy load column the high-rise, high-rise, long-span bridge structure. In addition, due to strong corrosion resistance, high quality, durability, features simple construction process, FRP can also be used as reinforcement material in concrete filled steel tubular column adhesive surface has been damaged, thereby prolonging the service life of concrete filled steel tubular structure. This paper deeply studies and discusses the composite short column two axis section pressure ultimate bearing capacity calculation method and axial compression performance, and by means of specific research work include: (1) combined with the existing experimental phenomena and points By analysis, a series of reasonable assumptions, derived by side pressure as the basic parameters of FRP- steel tube concrete composite columns and FRP- square steel tube composite column under axial compressive ultimate bearing capacity of the unified formula, the unified formula of simple procedures, clear physical meaning, more than other existing formulas by apply. The comparison between the calculation results and the unification of literature and a total of 61 sets of experimental data, this paper unified the result of calculation are in good agreement with the experimental value, which can provide a reliable basis for the design of composite column and theoretical analysis. (2) in ABAQUS software, established the FRP- steel tube concrete composite column and FRP- steel composite columns finite element model, comparative model and related literature corresponding to the ultimate bearing capacity of specimen, the whole process of axial load displacement curves and failure modes, the results show that the model established in this paper Type can be simulated and the steel drum bend distortion and FRP fracture test line distribution, bearing capacity and axial compression model of the whole process of load displacement curves and the ultimate and 18 groups of test results are in good agreement, which shows that the modeling method proposed in this paper can be used for the evaluation and analysis of FRP- steel tube concrete composite column under axial compression performance. (3) based on the above modeling method, the composite column specimens to establish 78 groups of different parameters of the system in the FRP layer, FRP type, concrete strength, steel yield strength and the influence of the thickness of steel pressure on the performance of composite columns; secondly, select the typical circular and square column specimens subjected to axial loading process the analysis of stress variation of parts, and further understand the two kinds of composite columns under axial pressure and the mechanism of performance performance; finally, combined with the test results of finite element analysis and the proposed axial circular and square columns full The four stage simplified model of load displacement curve of the process is presented, and the stress mechanism of the composite columns at different stages is expounded, which can provide references for further analysis of the composite column structure elastic-plastic.

【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9

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