【摘要】 由于FRP布提供的约束效应,混凝土的抗压强度能够得到很大的提高。较之实验研究,有限元(FEM)分析具有花费低、易于参数分析和易于得到混凝土截面应力分布等优点。通过基于DruckerPrager模型的有限元方法研究了FRP约束混凝土的力学性能。本文改进了线性Drucker-Prager材料模型并通过不同种类的实验(FRP约束实心混凝土实验和FRP约束空心混凝土实验)验证了该材料模型的合理性。基于验证后的有限元模型,通过参数分析研究了不同混凝土截面的应力分布情况以及空心率和FRP约束刚度对FRP约束空心混凝土力学性能的影响。最后提出了针对FRP约束混凝土极限应力和极限应变的计算方法,预测结果和实验结果基本一致。更多还原

【Abstract】 The compressive strength of concrete can be greatly enhanced owing to the confinement effect provided by encasing FRP wrap.Comparing with experimental investigation,the finite element method(FEM)has many advantages,such as low cost,ease to parametrical study and the stress distribution can be easily obtained.This paper presents a study on the structural behaviour of FRP-confined concrete by adopting Drucker-Prager model based FEM.The linear Drucker-Prager model was modified in this study and its reasonability was verified by different kinds of experiments,including test on concrete fully-filled FRP tube and concrete-filled FRP double-skin tubes.Based on the verified FEM model,parametrical study was conducted to study the stress distribution along cross-section and the effect of void ratio and confining stiffness on the structural behaviour of double-skin tubes.A design method was proposed to estimate the ultimate strength and ultimate strain of the FRP-confined concrete,and the computational values are found to agree well with the experimental results.更多还原