基于构件荷载-变形曲线的约束混凝土本构模型对比分析

Comparative study of confined concrete models based on load-deformation curves of reinforced concrete member

对16根钢筋混凝土圆柱进行了低周反复荷载试验,并采用6个不同的约束混凝土应力-应变模型对试件骨架曲线进行了计算。分析表明,尽管所选的约束混凝土应力-应变模型的差别很大,但利用不同的模型计算的柱荷载-变形曲线差别不大,与试验得到的荷载-变形曲线差别也不是很大,差别主要反映在曲线的下降段;在所选取的6个约束混凝土应力-应变关系模型中,采用Mander-Priestley模型和Fafitis-Shah模型计算的荷载-变形曲线与本文试验结果符合最好。

Cyclic loading tests were carried out on sixteen circular RC columns and the load-deformation curves of these columns were calculated using the chose six different stress-strain models of confined concrete. The results show that although the difference among the individual confined concrete models are remarkable, but their influence on load-deformation curves of column are unapparent and the discrepancy is on the descending branch of load-deformation curves. In the chose six stress-strain models of confined concrete, the prediction of load-deformation curves of column based on Mander-Priestley model and Fafitis-Shah model show satisfactory agreement with the experimental results.