摘要
应用纤维模型进行结构弹塑性分析时,需要对单元、截面以及纤维进行划分,其划分结果对计算效率和精度有较大影响。基于有限元软件OpenSees中的3种非线性单元(DB、FB和PH单元),本文通过算例计算,对单元、截面以及纤维的划分问题进行了研究。结果表明,对于DB单元,建议一个构件划分为5个单元,单元内使用4个截面积分点,截面上使用6×6的纤维积分点;对于FB单元,建议一个构件用1个单元模拟即可,单元内使用4个截面积分点,截面上使用6×6的纤维积分点;对于PH单元,建议根据经验预设合理的塑性铰长度,截面上使用6×6的纤维积分点。
In order to improve computational efficiency and accuracy,the divided numbers of elements,sections and fibers are evaluated by using three types of nonlinear fiber elements（DB,FB and PH elements） in finite element program OpenSees.Based on the analytical results,the divided methods for one member（a column or a beam）,are suggested： for DB element,the member can be divided into five elements,six section integration points and 6×6 fiber integration points;for FB element,the member can be divided into one element,four section integration points and 6×6 fiber integration points;for PH element,a reasonable hinge length ratios and 6×6 fiber integration points can be adopted.
出处
《地震工程与工程振动》
CSCD
北大核心
2012年第5期39-46,共8页
Earthquake Engineering and Engineering Dynamics
基金
中国地震局工程力学研究所中央级公益性研究所基本科研业务费专项资助(2010A04)
关键词
纤维模型
单元积分点
截面积分点
纤维积分点
fiber model
element integration points
section integration points
fiber integration points
