钢结构模块单元式轻型楼盖振动特性及舒适度分析
Vibration Characteristics and Human Comfort Analysis of Lightweight Steel Modular Unit Floors
轻型模块化建筑楼盖因柔度大、质量轻等特性,易产生人致振动舒适度问题。文中基于两种构造形式的模块化建筑楼盖实测数据,结合有限元模拟方法,深入研究骨架构造、泡沫混凝土填充及覆面层构造等因素对楼盖频率与振动加速度的影响规律,分析各因素的作用机理和相互影响关系,并提出提升楼盖振动性能的合理建议。结果表明:轻型楼盖的振动性能受其骨架构造和面层构造的共同作用;楼盖构造参数的变化主要通过改变楼盖质量和刚度,对自振频率和人致振动响应产生影响。在仅角部支撑的边界条件下,提升边梁刚度有助于改善轻型楼盖的振动控制效果;面层增厚及泡沫混凝土填充会增大楼盖质量,进而降低楼盖频率。轻型楼盖人致振动响应的主要影响因素为面层板厚度和泡沫混凝土填充;增大边梁抗弯刚度和抗扭刚度,对未填充泡沫混凝土的轻型楼盖振动控制具有一定作用。人致振动控制可优先采用长跨边梁跨中增设立柱支撑、楼盖骨架内填泡沫混凝土的措施,其次可增大面层厚度或面板刚度,采用箱形边梁也能部分改善楼盖的振动舒适度。
Lightweight modular floors often suffer from human-induced vibration comfort issues due to their high flexibility and light weight. Based on the measured data of two types of modular floors and combined with finite element methods, the influencing factors such as framework configuration, foam concrete infill and cover layer configuration on the frequency and vibration acceleration of the floor system are investigated. The mechanism of these factors and their interaction are analyzed, and reasonable suggestions for enhancing the vibration performance of the floor system are provided. The results show that the vibration performance of lightweight floors is collectively affected by their framework configuration and cover layer configuration. Under corner-only support boundary conditions the increase of edge beam stiffness has a certain positive effect on vibration control of lightweight floors. Thickening the cover layer and filling with foam concrete will increase the mass of the floors, thus reducing its frequency and vibration response. The thickness of cover layer and foam concrete infill are the main factors of human-induced vibration response in lightweight floors. Increasing the flexural and torsional stiffness of edge beams has a certain effect on the vibration control of lightweight floors without foam concrete infill. For human-induced vibration control, priority can be given to adding column supports at the mid-span of long-span beams and filling foam concrete in the floor framework. Secondly, increasing the thickness or stiffness of the facing layer can be considered. The box-shaped edge beams can partially improve the floor performance.
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国家自然科学基金(52278231)
湖南省科技创新计划(2023RC3038)
湖南省科技创新计划(2022RC1185)
湖南省自然科学基金(2023JJ40270)
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