Abstract

Precast hollow-core concrete (HC) slabs are widely used in construction, especially in Nordic countries. The combination of prestressing and low self-weight due to the voids makes it possible to build long-span floors. However, this also makes the floors more sensitive to vibrations from human activities. In this paper, experimental and finite element (FE) analyses of a test HC slab and four in-situ experiments performed in three buildings are presented. For each case, the dynamic assessment is performed using two design guides: SCI P354 (2009) and the Concrete Center (2006). These analyses show that the proposed FE models give accurate results compared to experimental findings and that the Concrete Center design guide gives lower predictions than the SCI P354 guide. In addition, several recommendations can be derived from these studies for the dynamic assessment of HC floors in the design process. The most important is that for some structures, the accelerations calculated using the design guides are significantly higher with an FE model including the considered floor and the surrounding walls than with an FE model including also the lower and higher floors.

摘要

预制空心混凝土 (HC) 板广泛用于建筑，尤其是在北欧国家。由于空隙而产生的预应力和低自重的结合使得建造大跨度楼板成为可能。然而，这也使地板对人类活动产生的振动更加敏感。在本文中，介绍了测试 HC 板的实验和有限元 (FE) 分析以及在三座建筑物中进行的四个现场实验。对于每种情况，动态评估是使用两个设计指南进行的：SCI P354 (2009) 和混凝土中心 (2006)。这些分析表明，与实验结果相比，提议的 FE 模型给出了准确的结果，并且混凝土中心设计指南给出的预测低于 SCI P354 指南。此外，从这些研究中可以得出一些建议，用于在设计过程中对 HC 地板进行动态评估。最重要的是，对于某些结构，使用设计指南计算的加速度在包含所考虑的地板和周围墙壁的 FE 模型中明显高于包含较低和较高楼层的 FE 模型。