岩棉夹芯金属屋面板的阻尼性能研究  

Damping properties of metallic sandwich roof panels with rock wool core

作　　者：王宸[1] 邓华[1] 黄莉[1] 

机构地区：[1]浙江大学空间结构研究中心,杭州310058

出　　处：《振动与冲击》2013年第20期55-60,共6页Journal of Vibration and Shock

摘　　要：岩棉夹芯金属板广泛应用于大跨度屋盖结构中,其弱刚度和阻尼性能会改变屋面脉动风荷载特性并影响屋盖结构的风振性能,但目前在设计中还鲜有考虑。对岩棉夹芯材料的拉压强度、弹性模量和泊松比等基本力学参数进行了测试。采用振动梁法进行了岩棉夹芯材料的阻尼性能试验,根据试验结果拟合得到了其损耗因子-频率曲线。进一步对一块0.4 m×2 m的典型跨度岩棉夹芯屋面板的阻尼特性进行数值分析,运用模态应变能法计算出该屋面板各阶模态下的损耗因子。结果表明,岩棉夹芯金属屋面板的模态损耗因子可高达0.5,其中垂直屋面板主振型的最小损耗因子都接近0.2,说明屋面板的阻尼效应在结构风振分析中不容忽视。Metallic sandwich panels with rock wool core （MSPRWC） are widely used in long-span roof structures. The weak rigidity and damping property of MSPRWC can change the characteristics of fluctuating wind pressure acting on the roof, and even have substantial effects on the dynamic response of structural wind-induced vibration. However, it is seldom considered in practical structural design. Here, some basic mechanical parameters of rock wool material including its tensile and compressive strength, elastic modulus and Poisson＇s ratio were measured. The damping property of rock wool was measured with the vibrating beam method, and the loss factor-frequency curve of rock wool material was fitted according to the testing results. Further, the modal strain energy method was employed to calculate the modal loss factors of a 0.4m× 2m MSPRWC with a typical span. The results revealed that the modal loss factor of MSPRWC can reach 0.5, the minimum loss factor of those main modes perpendicular to the roof panel even approaches 0.2; so, the damping properties of MSPRWC cannot be neglected for the analysis of structural wind-induced vibration.

关 键 词：岩棉 金属屋面板 阻尼性能 振动梁法 损耗因子 模态应变能法 

分 类 号：TU393.3[建筑科学—结构工程] TU551.3