FRP约束混凝土柱强度和极限应变模型的比较

Comparison of Strength and Ultimate Strain Models of Concrete Columns Confined with FRP

收集了大量试验数据,对已有的预测FRP约束混凝土柱强度和极限应变模型进行了评估。在保持已有模型预测圆形截面试件准确性的基础上,考虑截面有效约束,提出了对FRP约束圆形截面和矩形截面混凝土柱均适用的改进的强度和极限应变模型。评估结果表明,已有模型中对强度的预测要好于对极限应变的预测。Gampione强度模型对所有试件整体预测较准确,Lorenzis极限应变模型对圆形截面试件预测较准确。与试验数据和已有模型的对比表明,该文模型预测更准确,且计算更简便,可用于实际工程中对强度和延性的预测。

Based on maintaining the accuracy of existing models for circular specimens, revised models were proposed for predicting strength and ultimate strain of concrete columns confined with FRP with considering the effectiveness of confinement by cross-section. An evaluation of existing strength and ultimate strain models of concrete columns confined with FRP was presented with extensive collection of experimental data. It was shown that the prediction of strength was more accurate than that of ultimate strain, among which the prediction of Gampione＇s strength model and Lorenzis＇s ultimate strain model were more accurate for all specimens and circular specimens, respectively. The comparison with experimental results and existing models showed that the proposed models were more accurate, simpler and more convenient. The proposed models can be used for the prediction of strength and ductility in practical engineering.