纤维模型非线性梁柱单元的研究及数值模拟

【作者】 王飞； 钟铁毅； 刘海锋； 杨风利； 李清华；

【机构】 中国电力科学研究院； 北京交通大学；

【摘要】 介绍弹塑性有限元模型,研究基于刚度法的纤维单元和基于柔度法的纤维单元的工作原理,通过算例对基于刚度法的纤维单元和基于柔度法纤维单元对构件单元划分和积分点设置进行灵敏度分析,对比两种非线性单元的区别。介绍两种数值模拟方法,一种是Open SEES的改进模型,利用Hysteretic材料模拟钢筋。另一种是以ABAQUS为平台,利用基于ABAQUS的一组材料单轴滞回本构模型PQ-Fiber模拟,两种模拟方法和实验结果对比,得到了较好的结果。更多还原

【Abstract】 The calculation principle of elastic-plastic finite element models, stiffness based fiber element and flexibility-based fiber element are introduced in details. The sensitivity analysis of element division and integral point on elements is made by case study, differences between the elements are compared. Two numerical simulation methods are introduced, the first one is the improvement model based on the Open SEES,which the steel is simulated by the Hysteretic material. The second one is a model based on ABAQUS, which simulates the experiment by a collection of user-defined uniaxial material models in ABAQUS, these two methods get better results.更多还原