大跨度预应力加劲式组合梁楼盖动力响应研究

Dynamic response study of large-span prestressed reinforced type composite beam floor system

大跨度预应力加劲式组合梁楼盖体系是在组合梁和预应力结构理论研究基础上提出的新型楼盖体系。针对该楼盖结构,考虑楼盖板厚度、肋梁高度、预应力筋布置位置(即偏心距)等参数的影响,利用有限元软件ANSYS采用Block Lanczo法计算其各阶频率和振型。分析结果显示,肋梁高度和偏心距与基频之间近似呈线性关系,板厚度与基频之间近似呈抛物线形关系;肋梁高度对于楼盖基频的影响大于板厚和偏心距。分析结论对工程设计可提供参考。

Large-span prestressed composite beam floor system is an new floor system based on the theory research of composite beam and prestressed construction.By the method of Block Lanczo base on finite element software ANSYS,this paper analyze the influence of thickness,height and the location of prestressed steel( eccentricity) by the vibration shape diagram and frequency of each stage.The result reveal that,the height and eccentricity is linear to natural frequency,the thickness is parabolic to natural frequency,the influence of height on natural frequency is lager than thickness and eccentricity.The conclusion could be used by engineering design.