压弯剪作用下钢筋混凝土柱荷载-变形分析

LOAD-DEFORMATION ANALYSIS OF REINFORCED CONCRETE COLUMNS CONSIDERING AXIAL-FLEXURE-SHEAR INTERACTION

为研究不同破坏模式下钢筋混凝土柱的受力机理及性能,该文提出能够考虑压弯剪相互作用的钢筋混凝土柱荷载-变形分析模型。以修正压力场理论及传统纤维截面分析法为基础,将柱受力过程分为弯曲控制及剪切控制两个阶段,分别对控制截面受拉区和受压区进行分析,同时考虑了纵筋受压屈曲及P-效应的影响,进而得到柱水平受剪承载力及其变形。最后,为验证模型的有效性,对所收集的拟静力试验柱进行了模拟。结果表明,压弯剪作用下钢筋混凝柱会表现出弯曲、弯剪及剪切三种不同的破坏模式,其荷载-变形性能差异较大,采用该文所提模型所得计算曲线与试验结果吻合较好,该模型能够被用于钢筋混凝土柱抗震性能分析。

In order to study the load-bearing and performance of reinforced concrete columns with different failure modes,a load-deformation analysis model for reinforced concrete columns is proposed,considering the axial-shear-flexure interaction.Based on the modified compression field theory and the traditional fiber section analysis method,the whole loading process of the column is divided into two stages,i.e.,bending-control stage and shear-control stage.The tension and compression zones of the control section are analyzed separately,considering the effect of compressive buckling of longitudinal reinforcement and the P-effect,then the shear capacity and lateral deformation of the column are obtained.Finally,the collected pseudo-static test columns are simulated to verify the effectiveness of the proposed model.The results show that the reinforced concrete columns under axial-shear-flexure interaction will fail in three failure modes including flexural failure,flexural-shear failure and shear failure,the load-deformation performance of which varies greatly.The calculated curves obtained by the proposed model are in a good agreement with experimental results,so that the proposed model can be applied to analyze the aseismic performance of reinforced concrete columns.