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为探寻不同状态下U形钢板-混凝土组合梁的动力性能及其在结构状态评估中的应用,本文对3根组合梁进行了分级均布静力加卸载试验,期间卸掉荷载后,进行脉冲锤击激励条件下的动力测试,采用模态分析软件Mescope对测试中记录的传递函数(TRF)进行计算得到模态参数,总结了组合梁的动力性能特点,舍去了振型在支座位置幅度较大的重复模态,选择相对稳定的模态参数作为评估依据,组合梁中钢和混凝土的粘结作用较强时,频率较高而阻尼系数较小,相反粘结作用较弱时,频率较低而阻尼系数较大.结果表明:模态参数有一定的离散性,频率和阻尼比随构件状态变化规律比较明显,可作为结构损伤指标,相对稳定的模态振型随构件状态的变化极其微小,对结构损伤指示作用不大,可用来判断真假模态.
In order to explore the dynamic performance of U-shaped steel-concrete composite beams under different conditions and its application in the structural state assessment, three uniform beams were subjected to uniform static loading and unloading tests during the period of loading, Hammer excitation test conditions, the use of modal analysis software Mescope on the test transfer function (TRF) calculated modal parameters, summed up the composite beam of the dynamic performance characteristics, leaving out the vibration mode in the bearing position Larger repetitive modes are selected. Relatively stable modal parameters are selected as the assessment basis. When the bond between steel and concrete in the composite beam is stronger, the frequency is higher and the damping coefficient is smaller. On the contrary, when the bonding effect is weak, Low and high damping coefficient.The results show that the modal parameters have a certain degree of dispersion, and the frequency and damping ratio change obviously with the component state, which can be used as the indicator of structural damage. The relatively stable mode shapes vary greatly with the state of the component Slightly small, the role of structural damage is not significant, can be used to determine the true and false modalities.