建筑钢结构进展2011，Vol.13Issue(6)：31-35,43,6.
均布荷载作用下钢管混凝土拱长期稳定性能分析
Analysis on Creep Stability of Concrete-Filled Steel Tubular Arches under Uniform Load
摘要
Abstract
In this paper, a finite element model of concrete-filled steel tubular parabolic hingeless arches is built up with ABAQUS to investigate their creep stability under different loading ages.slendemess ratios and other parameters. In the analysis, the time-dependent behaviour of the core concrete is modeled by the EC2 model and step-by-step method and the material nonlinearities under ultimate conditions are also taken into account. The concrete model is introduced into ABAQUS with UMAT subroutine. The long-term ultimate capacity of arches can be obtained by increasing loads to their failure after the long-term loads are applied for a period. It is shown that the variation of the slendemess ratio,the loading age and rise to span ratio have significant influence on long-term stability of CFST parabolic arches. For arches subjected to low level of long-term loads which causes maximum stress in the core concrete reaching 30% of the concrete strength, the ultimate capacity of parabolic arches can decrease by 15% of the instantaneous ones in maximum.关键词
钢管混凝土/抛物线拱/收缩徐变/极限承载力Key words
CFST/ parabolic arch/ time-effects ultimate capacity分类
建筑与水利引用本文复制引用
王玉银,吴欣荣,耿悦,张素梅..均布荷载作用下钢管混凝土拱长期稳定性能分析[J].建筑钢结构进展,2011,13(6):31-35,43,6.基金项目
国家自然科学基金(51178146) （51178146）
