【摘要】 依据无机聚合物与钢管混凝土各自的特点,提出了无机聚合物圆形钢管混凝土组合结构。为研究该新型组合结构形式在往复荷载作用下的破坏特征、抗震性能、变形能力,本文以含钢率和轴压比为主要参数,进行了5根无机聚合物钢管混凝土柱拟静力试验,并分析各参数对试验结果的影响。考虑试件的初始缺陷及材料非线性进行了有限元分析。有限元计算及试验结果:有限元计算结果与试验结果吻合较好;试件的破坏为刚性夹具与试件连接处钢管截面被压曲、核心混凝土被压碎,构件丧失承载力,即为压弯破坏;试件的滞回曲线饱满,没有明显的捏缩现象,位移延性系数在3~8之间,基本满足结构抗震设计要求,表明无机聚合物钢管混凝土柱在往复荷载作用下具有良好的抗震性能;影响构件的抗震性能的最主要因素是含钢率,随含钢率的增大,无机聚合物圆形钢管混凝土构件抵抗地震的能力增强。更多还原

【Abstract】 Based on the characteristics of inorganic polymer concrete and steel,the authors propose the structure of inorganic polymer round concrete-filled steel tubular columns. In order to study the failure characteristics,seismic performance and deformability of inorganic polymers concrete-filled steel tubular columns under cyclic loads,in this paper five inorganic polymer concrete-filled steel tubular columns pseudo-static test was done considering the variation of axial load ratio and steel ratio of the specimens and analyzing the impact of various parameters on test results. Finite element analysis was carried out based on initial imperfection and material nonlinearity. The finite element analysis and the experimental results show that the finite element calculation results agree well with the experimental results. The failure modes of the columns are bending damage that the steel tube in the connection between rigid fixture and specimen is buckled and the core concrete is crushed and the specimen loses its carrying capacity.The hysteretic curves of the specimen are plump and have not significant pinch phenomenon in shape. The displacement ductility coefficient is from 3 to 8 and is satisfying the requirements of seismic design. Results indicate that the inorganic polymers concrete-filled steel tubular columns have excellent seismic performance. The main fac-tor that affects the seismic performance of the specimens is the steel ratio. The ability to resist earthquake increases with steel ratio increasing.更多还原