摘要
利用有限元软件ABAQUS,对不同参数的108根钢管混凝土叠合转换柱(STRC-RC)试件进行了低周反复加载模拟分析。结果表明,钢管延伸高度对转换柱承载力影响不大,但对转换柱延性影响较大;随着轴压比的增大,转换柱承载力先增大后减小,同时,较大的轴压比限制了弯曲变形的发展,导致试件延性和变形能力更差;随着含钢率的增大,转换柱承载力不断增大,位移延性系数则先增大后减少,因此需要保证转换柱合理的含钢率;增大配筋率可以显著提高STRC-RC转换柱的承载力,但对STRC-RC转换柱的延性影响较小;改变配箍方式对转换柱承载力和位移延性系数影响都较小。转换柱破坏形态主要有剪切破坏和弯曲破坏两种。钢管延伸高度越小、轴压比越大、含钢率越大的转换柱越容易发生剪切破坏;钢管截断位置箍筋加密能有效控制剪切裂缝的发展。
This paper simulates the experiment of 108 steel tube-reinforced concrete transfer columns （STRC-RC） specimens with different parameters under low reversed cyclic loading using finite element software ABAQUS. The study results show that： the extension length of steel tube has little effect on bearing capacity, but has great effect on displacement ductility. The beating capacity of the transfer columns firstly increases and then decreases, the dis- placement ductility decreases with an increase of axial load ratio. At the same times, larger axial load ratio restrains the development of bending deformation to result in more poor ductility and deformation capacity. Instead, the load capacity of the transfer columns increases, the displacement ductility coefficient firstly increases and then decreases with an increase of steel ratio, so reasonable steel ratio should be ensured. By increasing the steel reinforcement ratio, the bearing capacity of the STRC-RC transfer columns improves significantly, but has little effect on displacement ductility. Changing reinforcement style does not obviously affect the beating capacity and displacement ductility of transfer columns. Failure patterns of the transfer columns can be divided into Shear failure and bend failure. Shear failure easily occurs in the transfer columns that with shorter extension length of steel tube, higher axial compression ratio and higher reinforcement ratio. More stirrups at the position where steel tube is cut off can effectively control the development of shear crack.
出处
《世界地震工程》
CSCD
北大核心
2017年第1期1-9,共9页
World Earthquake Engineering
基金
国家自然科学基金项目(50878013)
