圆钢管高性能混凝土在往复荷载作用下的受力性能试验研究

Study on mechanical behavior of high performance concrete-filled steel tubular under reciprocating load

为研究圆钢管高性能混凝土在往复荷载作用下的破坏模态,分析圆钢管高性能混凝土在往复荷载作用下的受力性能及不同长细比和轴压比对P-D骨架曲线的影响,进行了12个圆钢管高性能混凝土往复荷载作用下的试验,其基本参数为长细比和轴压比。研究结果表明:试件呈延性破坏模态;P-D滞回关系曲线在在轴压比较大的时,图形都具有良好的饱满性,呈梭形,无明显的捏缩现象;长细比和轴压比对圆形截面钢管高性能混凝土在往复荷载作用下的受力性能有影响,随着轴压比和长细比的增大,圆钢管高性能混凝土耗能能力逐渐降低。

In order to study of failure mode of high performance concrete-filled steel tubular under reciprocating load and analysis of the mechanical behavior of high performance concrete-filled steel tubular under reciprocating loads and study of the influence of different slenderness ratio and axial compression ratio on P-Δ skeleton curves, this paper carried out the test of twelve high performance concrete-filled steel tubular under the reciprocating load, it basic parameters are slenderness ratio and axial compression ratio. The result showed that specimens appeared a ductile failure mode,P-Δ hysteresis curves has good fullness, showed spindle and there was no obvious pinch phenomenon even under high axial compression ratio. Slenderness ratio and axial compression ratio have an effect on the mechanical behavior of high performance concrete-filled steel tubular under reciprocating load.With the increase of the axial compression ratio and slenderness ratio, the energy dissipation capacity of high performance concrete-filled steel tubular was gradually reduced.