【作者】 张铮；

【导师】 韩林海； 陶忠；

【作者基本信息】 福州大学 ， 结构工程， 2003， 硕士

【摘要】 与混凝土结构类似，FRP约束混凝土柱在长期荷载作用下的力学性能也是值得关注的一个问题。本文进行了FRP约束混凝土柱的一系列试验研究，包括24个FRP约束混凝土构件在不同偏心率情况下的一次加载试验研究和8个FRP约束混凝土轴心受压构件在不同轴压比情况下在长期荷载作用下的力学性能试验研究。基于ACI209(1997)方法，建议了一种适合于长期荷载作用下FRP约束混凝土构件变形的分析模型和计算方法，理论结果和试验结果基本吻合，进而分析了加载龄期、持荷时间、轴压比、含FRP率、FRP抗拉强度、混凝土强度、长细比和荷载偏心率等因素对长期荷载作用下FRP约束混凝土构件变形性能的影响规律。在确定了长期荷载作用下FRP约束混凝土核心混凝土的应力—应变关系模型后，利用数值方法计算了考虑长期荷载作用影响时FRP约束混凝土构件的荷载—变形全过程关系曲线。在系统分析长细比、截面含FRP率、FRP抗拉强度、混凝土强度、加荷龄期和荷载偏心率等因素对长期荷载作用下FRP约束混凝土构件承载力的影响规律的基础上，给出考虑长期荷载作用影响时FRP约束混凝土构件承载力折减系数的简化计算公式，可为工程实践提供参考。更多还原

【Abstract】 FRP(Fiber Reinforced Plastic)-confmed concrete columns are susceptible to creep and shrinkage, which is common phenomenon in concrete structures. A series of specimens with circular sections were tested, which included the short-term behavior of 24 FRP-confmed concrete specimens under different load eccentricities and the long-term behavior of eight FRP-confined concrete columns under different load ratios. An attempt to predict the time-dependent behavior of FRP-confined concrete columns and beam columns with circular sections is proposed by the ACI209(1997) Specifications model. A comparison of results calculated using this model shows good agreement with those of test. Based on the theoretical model, influences of the changing time immediately after loading, time under sustained loading, strength of the materials, load ratio, FRP ratio, slenderness ratio and load eccentricity ratio on the long-term effects are discussed. An attempt to predict the stress-strain relations of the core concrete after sustaining axially of eccentrically compressive load by means of a model that is proposed. The load-deformation behavior of the FRP-confined concrete columns and beam-columns is analyzed. Based on the theoretical model, influence of slenderness ratio, the changing FRP ratio, strength of the FRP composites and the concrete as well as load eccentricity ratio on the bearing capacity of the members after sustained load is discussed. Finally, simplified calculating method of the reduction factor for the bearing capacity of circular FRP-confined concrete beam-columns with long-term effects considered is suggested. The achievements in this paper may be referred for practical engineering.更多还原