建筑结构学报2011，Vol.32Issue(8)：59-68,10.
三向荷载作用下圆钢管材料本构模型研究
Constitutive model of circular steel tubes under complicated cyclic load
摘要
Abstract
The performance of space lattice structures can be significantly affected by the cumulated damage of material caused by large deformation and obvious material plasticity under severe earthquakes.The spatial experiment of circular steel tubes under cyclic axial and horizontal loads was conducted to get a rational constitutive model.The hysteretic behavior of specimens with different slenderness ratios and different loading schemes was investigated.Then,finite element models were developed using a user-defined material sub-routine UMAT encoded incorporating ABAQUS to consider the damage accumulation.Finally,a general constitutive model of circular steel tubes considering damage accumulation was developed based on the agreement between numerical simulation and experimental results.Comparison results show that theoretical curves are in good agreement with experiments in terms of the constitutive model.That proves not only the constitutive model is accurate but also the finite element program is applicable for theoretical analysis.Using the finite element model,responses of reticulated shells with different parameters under severe earthquakes are investigated and the characteristic responses at structural failure are discussed as well.It is found that the damage accumulation reduces the structural failure load obviously.关键词
圆钢管/空间滞回试验/累积损伤/滞回性能/本构模型Key words
circular steel tube/spatial hysteretic experiment/camulated damage/hysteretic behavior/constitutive model分类
建筑与水利引用本文复制引用
范峰,聂桂波,支旭东..三向荷载作用下圆钢管材料本构模型研究[J].建筑结构学报,2011,32(8):59-68,10.基金项目
国家自然科学基金重大研究计划重点项目（90715034）,国家自然科学基金面上项目 （）
