岩棉夹芯屋面板对屋盖结构风振效应的影响

发布时间：2018-07-01 17:04

本文选题：复合屋面板 + 岩棉夹芯　；参考：《浙江大学学报(工学版)》2017年11期

【摘要】：为了探究常用岩棉夹芯复合屋面板的有限刚度和阻尼性能对大跨度结构风振效应的影响机理,基于已有材性试验数据开展该类屋面板的有限元分析.利用模态应变能法进行分析发现,典型檩距屋面板各阶模态均呈现出高阻尼特征并显著降低脉动风幅值.屋面板的有限刚度则会放大风压脉动分量并将能量集中到屋面板的基频附近.屋面板性能对屋盖主体结构风振效应的影响同屋面板与主体结构间的振动协调性、屋面板有限刚度对脉动风压的放大效应以及岩棉夹芯层的阻尼3方面因素密切相关.对于基频较低(2.23Hz)或中等(5.0 Hz)的主体结构,无屋面板风振计算模型会高估风振效应;当基频较高(7.5Hz)时,该影响较小且可以忽略.
[Abstract]:In order to investigate the influence mechanism of finite stiffness and damping performance of rock cotton sandwich composite roof slab on wind-induced vibration effect of long-span structure, finite element analysis of this kind of roof slab is carried out based on the available material test data. By means of modal strain energy method, it is found that all modes of typical purlin distance from roof plate exhibit high damping characteristics and significantly reduce the amplitude of pulsating wind. The finite stiffness of the roof slab will enlarge the fluctuating component of the wind pressure and concentrate the energy near the fundamental frequency of the roof slab. The effect of roof slab performance on the wind-induced vibration of the main roof structure is closely related to the vibration coordination between the roof slab and the main structure, the amplification effect of the finite stiffness of the roof slab to the fluctuating wind pressure and the damping of the rock cotton sandwich layer. For the main structure with lower (2.23 Hz) or moderate (5.0 Hz) fundamental frequency, the wind-induced vibration effect of the model without roof slab is overestimated, while the wind vibration effect is small and negligible when the fundamental frequency is high (7.5 Hz).
【作者单位】：浙江大学空间结构研究中心;
【基金】：浙江省自然科学基金资助项目(LY14E080015)
【分类号】：TU312.1

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