风荷载作用下混凝土房屋及顶上钢塔结构动力时程分析

DYNAMIC TIME-HISTORY ANALYSIS OF THE HYBRID STRUCTURE OF STEEL TOWER ATOP RC BUILDING UNDER WIND

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。

The structure of Steel Tower atop RC Building is just extensively applied.Using both non-classical damping and the equivalent damping models,this structure with a clear delineation of the damping is dynamically investigated as the wind is applied on it.The two methods of Calculation are direct integration algorithm and non-classical modal superposition.The result shows that:Non-classical damping model can more accurately reflect the dynamic response of this structural.Due to direct integration algorithm has precise result,the work in calculation is very heavy and the expenses is higher.Non-classical modal superposition cost lower.When the modal number superposed in internal force is twice more than that superposed in displacement,the satisfied result will be reached in internal force.