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混凝土房屋及顶上钢塔结构正被广泛应用,采用非比例阻尼与折算阻尼两种模型,对此类阻尼具有明显分界的结构在风荷载作用下进行动力分析,计算采用直接积分法和非经典振型法。计算结果表明:折算阻尼法不能反映此类结构钢塔阻尼突然变小,位移、内力突然增大的现象;而非比例阻尼模型可以准确反映此现象。直接积分法计算结果精确,但计算工作繁重,费用较高;非经典振型分解法计算成本较低,但是参与叠加的振型阶数应比满足位移精度要求的振型阶数至少多一倍以上时才能达到满意的内力结果。
Concrete buildings and overhead steel towers are widely used. Non-proportional damping and conversion damping models are used. The structure with obvious demarcation of such damping is subjected to dynamic analysis under wind loads. The direct integration method and non-classical Mode shape method. The calculation results show that the damping method can not reflect the sudden decrease of the damping of the steel tower, and the sudden increase of displacement and internal force. The non-proportional damping model can accurately reflect this phenomenon. The result of the direct integration method is accurate, but the computational work is heavy and the cost is high. The non-classical mode decomposition cost is lower, but the order of the mode shapes participating in the superposition should be at least double the order of the mode shapes satisfying the displacement precision requirement Above can achieve satisfactory internal force results.