建筑结构学报2018，Vol.39Issue(5)：18-26,9.DOI:10.14006/j.jzjgxb.2018.05.003
钢-混凝土组合空间框架拟动力有限元分析
Finite element analysis for pseudo-dynamic behavior of steel-concrete composite space frame
摘要
Abstract
Based on the plastic-damage constitutive model of concrete and elasto-plastic mixed hardening constitutive model of steel,finite element software ABAQUS was used to build an elaborate 3D solid finite element model and perform pseudo-dynamic analysis of a two-story space frame with circular concrete-filled tubular (CFT) columns and RC frame beams. The model considers the confinement effect of the steel tube on the core concrete and the cumulative effect of the plastic energy dissipation caused by the continuous earthquake action. Further calculation was conducted on axial compression ratio of CFT columns,lateral deformation coefficient of steel tube,stress-strain hysteresis curves and plastic energy dissipations of the steel tube,the core concrete,as well as the rebar and concrete of RC frame beam,ring beam and floor slab. The results show that: because of the accumulative effect of plastic energy dissipation from pseudo dynamic test under continuous cases,the displacement of the floor is increased and the story stiffness is decreased significantly; after the seismic action of continuous cases,all the steel tube and rebar yield,the strength of the core concrete and the ring beam concrete exceeds its axial compressive strength due to the confinement effect of the steel tube and rebar. Besides,the concrete of floor slab cracks because of tension; the axial compression ratio of the CFT columns on the short side varies with time and exceeds those of corner columns,interior columns and columns on the long side under rare earthquake; the CFT columns are the main plastic energy dissipation members,followed by the ring beams.关键词
钢-混凝土组合框架/有限元分析/拟动力特性/刚度损伤/塑性耗能Key words
steel-concrete composite frame/finite element analysis/pseudo-dynamic behavior/stiffness damage/plastic energy dissipation分类
建筑与水利引用本文复制引用
丁发兴,朱江,罗靓,王莉萍,陈明,余志武..钢-混凝土组合空间框架拟动力有限元分析[J].建筑结构学报,2018,39(5):18-26,9.基金项目
国家重点研发计划专项(2017YFC0703404). （2017YFC0703404）
