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进行了5根高强混凝土装配式管柱在0.15轴压比下的拟静力试验,研究配筋形式、预应力度对管柱抗震性能的影响.其中2个为配置12根预应力钢棒的试件,3个为同时配置6根预应力钢棒和6根HRB400级钢筋的混合配筋试件,5根管柱均通过装配式柱脚与承台连接.试验得到试件破坏形态、滞回曲线、承载能力、刚度变化、耗能能力等.结果表明:预应力度较小的混合配筋试件裂缝开展充分,滞回环较仅配置预应力钢棒的试件饱满;至试件破坏,装配式柱脚均未发生较大变形或锚栓破坏,满足正常使用要求.在此基础上,修正混凝土结构设计规范中关于混凝土环形截面抗弯承载力计算公式,建立了适用于高强混凝土混合配筋管柱正截面抗弯承载力计算公式.
Quasi-static tests of five high-strength concrete-filled tubular columns under 0.15 axial compression ratio were carried out to study the influence of reinforcement form and prestressing force on the seismic performance of the tubular string. Two of them were equipped with 12 prestressed steel bars Three specimens were mixed with six prestressed steel bars and six HRB400 steel bars, and the five columns were all connected with the cap through the assembly type column foots.The test specimens were damaged in shape and hysteresis Back curve, bearing capacity, stiffness change, energy dissipation capacity, etc. The results show that the fracture of the hybrid reinforced specimens with small prestressing strength is sufficiently developed, the hysteresis loop is more full than those with only prestressed steel bars, , No large deformation of the column or column assembly deformation or anchor damage, to meet the normal use requirements.On this basis, to amend the design specifications of concrete structures on the annular section of concrete flexural capacity formula for the establishment of a suitable high-strength concrete mix Calculation formula of flexural capacity of normal section of reinforced.