The U-shaped steel–concrete composite hollow waffle floor is an innovative slender large-span floor system, where severe vibration may occur under human-induced excitations. In this research, a theoretical analysis and experimental testing are performed to explore the vibration behaviour of the composite hollow waffle floor. First, the natural frequency formula is proposed based on orthotropic thin plate theory, and the main rigidity calculation for the composite hollow waffle floor is given. Second, the mode shape, frequency and damping ratio of the composite hollow waffle floor are captured by on-site tests and validated by analytical and numerical methods, indicating that the floor has a low-frequency with a low damping ratio. Third, the vibration response of the composite hollow waffle floor is obtained by walking and running tests considering the influence of the frequency, spatial position, group size and route; in addition, the relationships between the values involved in the vibration evaluation are discussed. Finally, the composite hollow waffle floor presents satisfactory vibration performance evaluated by the threshold values among the current codes.

中文翻译：

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U型钢-混凝土复合空心华夫格地板在人为激励下的振动

U型钢-混凝土复合空心华夫地板是一种创新的细长大跨度地板系统，在人为激励下可能会发生剧烈振动。在这项研究中，进行了理论分析和实验测试，以探索复合空心华夫格地板的振动行为。首先，基于正交各向异性薄板理论提出了固有频率公式，并给出了复合空心华夫地板的主要刚度计算。其次，通过现场测试捕获复合空心华夫格地板的振型、频率和阻尼比，并通过解析和数值方法进行验证，表明地板具有低阻尼比的低频。第三，综合考虑频率、空间位置、群体规模和路线的影响，通过步行和跑步试验得到复合空心华夫地板的振动响应；此外，还讨论了振动评估中涉及的值之间的关系。最后，复合空心华夫格地板呈现出令人满意的振动性能，由当前代码中的阈值评估。