弹塑性纤维梁柱单元及其单元参数分析

基于柔度法且沿单元长度积分的弹塑性纤维梁柱单元是可以模拟复杂的截面双向滞回曲线和截面刚度沿杆长方向连续变化的单元模型。由于其计算工作量太大,这种复杂的单元自提出以来,一直没有得到推广应用。对弹塑性纤维梁柱单元模型进行了研究,在此基础上对其单元参数进行了分析,通过研究单元积分段以及截面上纤维的合理划分,使计算工作量适当减少而又不影响计算结果准确性,为纤维单元在大型结构中应用打下基础。

ELASTIC-PLASTIC FIBER BEAM-COLUMN ELEMENT AND ITS PARAMETRIC ANALYSIS

The flexibility-based elastic-plastic fiber beam-column element, which is integrated along the element axis, can simulate the complex bi-hysteresis curve of section and the continuous changing of section stiffness along the element axis. Due to large time consumption, this complex element model has not been widely used since it was introduced. A parametric analysis of fiber beam-column element is carried out in this paper. It is found that the time consumption can be properly reduced and the analysis precision is ensured by controlling the number of element slices and fibers of section. Thus, the element is made applicable in large-scale structures.