钢管混凝土柱脱粘对结构受力性能有很大影响，脱粘检测成为研究者关注的问题。设计制作了5个不同脱粘状态的钢管混凝土悬臂柱试件，在锤击激励下记录试件表面6个测点的自由振动加速度信号。通过解析模式分解，分离出信号的一阶频率分量，再利用Hilbert变换，获得频率-振幅曲线。频率-振幅曲线表明无脱粘的钢管混凝土柱试件呈现出较强的非线性振动特性，与弱Duffing系统相似。脱粘的存在，使得试件的非线性特性减弱，脱粘面积越大，非线性系数绝对值越小。信号测点离脱粘位置越近，非线性特性越弱，非线性系数绝对值越小。非线性系数对脱粘敏感，且不易受构件制作和边界条件的影响，是识别钢管混凝土柱脱粘的良好指标。
Abstract
De-bonding of concrete-filled steel tube columns greatly affects structural load-bearing performance, and de-bonding detection receives many researchers’ attention. Here, 5 specimens of cantilevered concrete-filled steel tube columns with different de-bonding states were fabricated, and free vibration acceleration signals of 6 measured points on each specimen surface were recorded simultaneously under hammering excitation. The first order frequency component of recorded signals was separated with the analytical mode decomposition, and then Hilbert transformation was used to get frequency-amplitude curves. The frequency-amplitude curves showed that the specimens without de-bonding reveal stronger nonlinear vibration characteristics, and they are similar to weak Duffing systems; de-bonding existence weakens the specimens’ nonlinear characteristics, the larger the de-bonding area, the smaller the nonlinear coefficients’ absolute values; the closer to de-bonding position the signal measurement point, the weaker the nonlinear characteristics, and the smaller the nonlinear coefficient absolute values; nonlinear coefficients are sensitive to de-bonding and independent of component fabrication and boundary conditions, so they are good indexes to recognize de-bonding of concrete filled steel tube columns.
关键词
钢管混凝土柱 /
非线性振动特性 /
脱粘识别 /
解析模式分解 /
Duffing系统
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Key words
concrete-filled steel tube columns /
nonlinear vibration characteristics /
recognition of de-bonding /
analytical mode decomposition /
Duffing system
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