论文部分内容阅读
近年来,已有不少纤维增强复合材料(Fiber reinforced polymer,简称FRP)约束混凝土圆柱的应力-应变关系模型,然而有学者指出,现有模型较难得到预测误差分别小于14%和35%的抗压强度模型和极限应变模型,因此FRP混凝土圆柱应力-应变关系的极限状态(即抗压强度fcc’和极限应变εcc)尚未得到较准确地预测。本文建立在较大数据库(418个试验数据)基础上,回归得到精度较高的强度模型和极限应变模型,进而得出预测趋势较好的两段式应力-应变关系模型,通过与现有模型的比较,本文模型能够对不同尺寸和不同约束水平的FRP约束混凝土圆柱的强度、极限应变和应力-应变关系做出较满意的预测。
In recent years, there have been a number of fiber reinforced polymer (FRP) confined stress-strain relationship models for concrete columns. However, some scholars have pointed out that existing models are more difficult to obtain prediction errors of less than 14% and 35%, respectively. The compressive strength model and the ultimate strain model, therefore, the ultimate state of the stress-strain relationship of the FRP concrete cylinder (ie, compressive strength fcc′ and ultimate strain εcc) has not yet been accurately predicted. This paper builds on a large database (418 experimental data), and returns a high-precision strength model and an ultimate strain model, and then obtains a two-stage stress-strain relationship model with a better prediction trend. In comparison, this model can make satisfactory predictions for the strength, ultimate strain and stress-strain relationship of FRP-confined concrete columns of different sizes and different restraint levels.