基于Opensees纤维模型的钢筋混凝土柱数值分析与对比

NUMERICAL ANALYSIS AND COMPARISON OF REINFORCED CONCRETE COLUMN BASED ON FIBER MODEL IN OPENSEES

为选取适当的纤维模型用于钢筋混凝土构件数值分析,文中探究Opensees中基于刚度法、柔度法和塑性铰三种纤维模型的特点和适用性。文中以2个钢筋混凝土柱试验为参照,采用三种纤维模型分别建立钢筋混凝土柱数值分析模型,最后通过不同纤维模型的数值分析结果与试验结果进行对比。结果表明三种纤维模型都能准确得到钢筋混凝土构件初始刚度;基于柔度法模型和基于塑性铰模型的力-位移曲线能反映钢筋混凝土构件实际承载力及其下降特征,而基于刚度法模型难以反映钢筋混凝土构件刚度降低,基于柔度法模型和基于塑性铰模型具有更高的准确性。研究结果可为选用合适的纤维模型提供借鉴。

For better numerical simulation of fibers within the reinforced concrete members, the characteristics and applicability of three fiber models based on stiffness method, flexibility method, and plastic hinge were studied by the Opensees software. Furthermore, based on two reinforced concrete column testing data, three kinds of fiber models were used to establish the numerical analysis models of reinforced concrete column respectively. Finally, the numerical analysis results of different fiber models were compared to the test results. The results showed that the initial stiffness of reinforced concrete components was estimated by the three fiber models accurately. In addition, the force-displacement curve obtained by the flexibility method and the plastic hinge model could reflect the actual bearing capacity and its decline characteristic of reinforced concrete component. However, the stiffness method model was difficult to reflect the stiffness reduction of reinforced concrete component, so the accuracy of the flexibility method model and the plastic hinge model was higher. The results were helpful to choose suitable fiber models in the similar cases.