型钢超高强混凝土框架柱抗震构造措施研究

SEISMIC DESIGN DETAILS OF STEEL REINFORCED HIGH STRENGTH CONCRETE COLUMNS

为研究型钢超高强混凝土(SRHC)框架柱的抗震性能和抗震构造措施,开展24个SRHC框架柱的低周反复加载试验。首先,根据试验结果分析了不同试验参数(包括剪跨比、轴压力水平以及型钢和箍筋的配置)对SRHC框架柱的破坏形态、滞回性能和变形能力的影响;其次,在此基础上结合试验数据分析提出了SRHC框架柱的抗震构造措施,包括不同抗震等级时的轴压比限值和箍筋加密区的最小配箍要求,箍筋加密区长度及最小含钢率。

In order to study the seismic behavior and seismic design details of steel reinforced high-strength concrete（ SRHC） columns,twenty-four SRHC column specimens were tested under combined constant axial load and cyclic lateral force. The effect of testing parameters including shear-span ratio,axial load,and arrangement of structural steel and stirrups on the failure mode,hysteretic behavior and deformation capacity of SRHC columns were analyzed.Based on the experimental results,the seismic design details of SRHC columns were proposed,such as the axial load ratio limits for different seismic grades,stirrup requirements for different seismic grades in the critical region of columns,the length of critical region for confinement stirrups,and the minimum steel ratio.