基于振动舒适度要求的蜂窝形钢空腹夹层板楼盖自振频率分析

Natural frequency analysis of the honeycomb type steel open-web sandwich plate floor based on vibrate comfort requirement

提出了一种新的楼盖结构形式——蜂窝形钢空腹夹层板结构,并介绍了结构的几何构型特点。为了研究该种结构的自振频率,基于通用有限元分析软件ANSYS建立了结构分析有限元模型,采用子空间迭代法计算结构各阶频率和振型。考虑高跨比、表层板厚度、上下肋刚度、长宽比和剪力键厚度对结构动力特性的影响,对结构进行了参数化分析,并拟合基频的计算公式。结果表明,蜂窝形钢空腹夹层板具有类似于实心平板结构的振动特性。根据对比分析得知,上述各因素中表层板厚度、上下肋刚度、高跨比和长宽比能显著改变空腹夹层板的基频,剪力键厚度对基频影响较小。

A new form of floor structure--the honeycomb type steel open-web sandwich plate structure is proposed in this paper, and the geometrical configuration feature of the structure is introduced. In order to study the natural frequency of this structure, the finite element model of structural analysis is established based on the general finite element analysis software ANSYS. The subspace iteration method is used to calculate the frequencies and modes of the structures. The effects of the ratio of height to span, the thickness of surface plate, the stiffness of upper and lower chords, the ratio of length to width and the thickness of shear connector on the dynamic characteristics of the structure are also considered, and the parametric analysis of the structure is also carried out. The fitting method is used in forming the formula for calculating the fundamental frequency. The results show that the vibration characteristics of the honeycomb type steel open-web sandwich plate are similar to that of the solid plate structure. According to the comparative analysis, it is found that the thickness of surface plate, the stiffness of upper and lower chords, the ratio of height to span and the ratio of length to width can significantly change the fundamental frequency of the open-web sandwich plate, and the effect of the thickness of shear connector on fundamental frequency is small.