钢骨超高强混凝土短柱抗震性能试验研究

Experimental research on steel reinforced ultra high-strength concrete short columns in seismic performance

对12根钢骨超高强混凝土短柱（λ≤2．0）在低周反复荷载下抗震性能进行了试验．发现其压缩强度为92．9～108．1MPa，柱主要破坏形态为剪切破坏．并且分析了剪跨比、轴压比及配箍率对延性的影响，最后根据试验结果，提出了满足一定延性要求（μ△≥3．0）钢骨超高强混凝土短柱的轴压比限值和箍筋加密区的最小体积配箍率的建议值．该值要比现行规程的相关规定更为严格．同时进一步提出了箍筋加密区的最小配箍特征值，可为规程的修订及工程应用提供参考．

The experimental research on 12 steel reinforced ultra high-strength concrete short columns （λ≤ 2.0） subjected to low cyclic reversed lateral loads in seismic performance was carried out. The value of ultra high-strength concrete compressive strength ranged from 92. 9 to 108.1 MPa. The experimental results show that the main failure pattern of the specimens is shear failure. Then, the affecting factors of ductility such as shear span ratio, axial compression and stirrup ratio were analyzed. Finally, the suggested values of the axial compression ratio and minimum stirrup characteristics value, which satisfy the certain requirements of ductility （μ△≥ 3.0）, are obtained through the experimental results. The suggested values could provide the reference for engineering application and amend the current Chinese design code of steel reinforced concrete composite structures.