基于OpenSees的RC柱拟静力数值分析模型

摘要

The reinforced concrete column in equal displacement loading quasi-static test was analyzed by OpenSees. Considering the effects of different steel and concrete constitutive selection and match, fiber division, element division, integration points on numerical simulation, a reasonable and effective numerical model was made. The results indicate that:in OpenSees, the results vary greatly when selecting different steel and concrete constitutive models to simulate. Matching different steel and concrete constitutive models also have a greate effect on numerical simulation results; for steel constitutive, Steel02 and ReinforcingSteel simulation results are better than Steel01, and they matches different concrete constitutive;for concrete constitutive, Concrete01 simulates best;the form of fiber cross-sectional division has a great impact on the simulation results. When the fiber is divided m=1 parallel to the direction of force, n=10 perpendicular to the direction of force,the result can meet the precision requirement; the number of elements has some influence on the simulation results, 5 elements can achieve the precision;integration points have little effect on the simulation results, when a element has 4 integration points, the calculation precision of the model is already high.%本文以OpenSees为分析平台,对等位移加载的拟静力试验钢筋混凝土柱进行数值分析。考虑钢筋与混凝土材料本构的选取与搭配、纤维划分、单元划分、积分点数的不同对数值模拟带来的影响,建立合理有效的数值分析模型。分析结果表明：在OpenSees中,选用不同钢筋与混凝土本构模型进行模拟时,计算结果差别较大,且采用不同钢筋与混凝土材料本构进行搭配建模时,对数值模拟的结果也有较大影响；对于钢筋本构, Steel02、ReinforcingSteel模拟效果比 Steel01好,且二者分别适应不同的混凝土本构；对于混凝土本构, Con-crete01模拟效果最好；纤维截面划分形式对模拟结果有较大影响,平行于作用力方向划分m=1,垂直于作用力方向划分n=10即可满足精度要求；单元数量对模拟结果有一定影响,划分5个已能达较好精度；单元积分点数对模拟结果影响不大,单元取4个积分点时,模型的计算精度已经很高。