低周反复荷载下型钢混凝土柱滑移性能试验研究

通过在型钢翼缘外侧滑移传感器,对轴力和反复水平荷载作用下型钢混凝土柱的粘结滑移性能进行了试验研究.试验中主要考虑了跨比、轴压比、配箍率、混凝土强度的影响.由试验得到了水平荷载-滑移滞回曲线和骨架曲线、滑移沿柱高的分布规律等.试验结果表明,型钢混凝土的荷载-滑移滞回曲线比较丰满,在整个加载过程中没有明显的"捏拢"现象;滑移沿柱高大致呈指数分布,柱根位置的滑移量最大,由柱根向柱顶逐渐递减;当剪跨比小于2时,滑移随剪跨比的增大而减小,当剪跨比大于2以后,滑移又随剪跨比的增大而增大;滑移随着轴压比的增大增大,随着配箍率和混凝土强度的提高而减小;随着荷载循环次数的增加,滑移刚度不断减小,滑移量不断增大,出现明显的粘结退化现象.

Experimental study on slip behavior between shaped steel and concrete in SRC columns under cyclic reversed loading

Slip distribution behavior of SRC (steel reinforced concrete) columns under constant axial load together with cyclic reversed horizontal load is studied by embedding slip transfers on the flanges of shaped steel. Four test parameters,i. e., shear span ratio, axial compression ratio, stirrup ratio and volumetric ratio and concrete strength are taken into consideration- Hysteretic and skeleton curves of slip against horizontal load as well as slip distribution law along columns are obtained from tests. Test results show that the hysteretic curve of slip against horizontal load is chubbiness and fold phenomenon does not occur in the course of loading. The interior slip between shaped steel and concrete is exponentially distributed along the columns. Maximum slips lie in the bottom of columns, and gradually descend from bottom to top. Slip increases with the increase of axial compression ratio, but decrease with the increase of stirrup ratio or concrete strength.When the shear span ratio is less than 2. 0, slip decreases with the increase of shear span ratio, but when shear span ratio exceeds 2.0, slip increases with the increase of shear span ratio. Slips increase with the load-reversed time, demonstrating the phenomena of bond degeneration.