FRP管的力学计算及FRP管混凝土轴压构件研究

发布时间：2018-05-02 14:45

本文选题：FRP管 + FRP管混凝土　；参考：《华中科技大学》2013年硕士论文

【摘要】：纤维增强复合材料（Fiber Reinforced Polymer，简称FRP）以质轻高强、耐腐蚀、抗疲劳、可设计性好等优点被倍受土木工程界和复合材料界的青睐。将混凝土灌注于预制的FRP管中而成的FRP管混凝土轴压构件，集混凝土良好的抗压能力与FRP这种新型材料优点于一身，有比钢管混凝土更广的适用范围。目前，大多数试验研究是关于管厚、纤维缠绕角度、纤维类型对FRP管混凝土轴压性能的影响，，只是定型的进行试验分析没有从根本上研究这些参数对FRP管的力学性能的作用进而影响FRP管混凝土的轴压性能。本文首先介绍FRP管使用的常见纤维和基体的力学特性以及缠绕制作工艺、拉挤-缠绕制作工艺；建立FRP单层板这个FRP管的基本单元的应力-应变关系与强度理论，单层板以不同铺设角度、铺设顺序和铺设厚度形成FRP管（实质是FRP层合板），推导FRP层合板的本构关系，计算出FRP管轴向和环向弹性模量和泊松比，分析FRP管的破坏机理，提出FRP管的强度计算方法。然后对FRP管混凝土轴压受力分析与力学计算，结合计算所得FRP管的力学参数，提出一种FRP管混凝土轴压应力-应变曲线与构件破坏时各项极限参数的计算方法，结合FRP管的计算理论整合归纳出从纤维、基体的类型，FRP单层板的铺设方式得出FRP管的刚度和强度，再对FRP管混凝土轴压构件的本构关系和极限承载力的计算框架，也能指导FRP管混凝土轴压构件的设计。最后设计试验测定FRP管的弹性常数和环向断裂应变、FRP管混凝土的轴压应力-应变曲线及极限承载力。
[Abstract]:Fiber Reinforced Polymer (FRP) has been favored by civil engineering and composite materials for its advantages of light and high strength, corrosion resistance, fatigue resistance and good designability. The axial compression member of FRP tube made by pouring concrete into prefabricated FRP pipe combines the advantages of good compressive capacity of concrete and new material such as FRP, and has a wider range of application than concrete filled steel tube (CFST). At present, most of the experimental studies are about the influence of pipe thickness, filament winding angle and fiber type on the axial compression properties of FRP pipe concrete. However, the effect of these parameters on the mechanical properties of FRP pipes has not been studied and then the axial compression behavior of FRP concrete has been affected. In this paper, the mechanical properties of the common fiber and matrix used in FRP tube, the winding process, the pull-winding process, the stress-strain relation and strength theory of the basic unit of FRP single layer plate are introduced in this paper. The FRP pipe is formed by the single layer plate with different laying angles, laying sequence and laying thickness (essentially FRP laminated plate). The constitutive relation of FRP laminated plate is derived, the axial and circumferential elastic modulus and Poisson's ratio of FRP pipe are calculated, and the failure mechanism of FRP pipe is analyzed. A method for calculating the strength of FRP tube is presented. Then, the stress analysis and mechanical calculation of FRP pipe concrete under axial compression, combined with the calculated mechanical parameters of FRP pipe, a method for calculating the stress-strain curve of FRP pipe concrete under axial compression and the limit parameters of component failure is put forward. Combined with the calculation theory of FRP pipe, the stiffness and strength of FRP pipe are derived from the type of fiber and matrix laying, and the calculation frame of constitutive relation and ultimate bearing capacity of FRP tube concrete axial compression member is given. It can also guide the design of FRP tube concrete axial compression member. Finally, the elastic constants and the axial compressive stress-strain curves and ultimate bearing capacity of FRP tube concrete are measured by design test.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.9

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