Vibration Performance Assessment of a Long-Span Concrete Floor Using Field Measurements over a Five-Year Period
Vibration Performance Assessment of a Long-Span Concrete Floor Using Field Measurements over a Five-Year Period
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DOI：
10.1260/1369-4332.17.8.1145
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发表时间：
2014-08
影响因子：
2.6
通讯作者：
Jun Chen;Shi Yan;Mengshi Zhang
中科院分区：
文献类型：
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作者：
Jun Chen;Shi Yan;Mengshi Zhang
2008年至2013年期间，在一个独特的大跨度后张混凝土楼板上进行了现场测试。测量范围涵盖建筑工程的重要阶段，包括完成结构楼面、安装活动楼面、完成整幢楼宇及开放予公众人士。本文通过现场测试对楼板的振动性能进行了评估。从环境振动测量中识别了8个不同阶段的地板的固有频率、阻尼比、振型和模态质量。自2009年该建筑向公众开放以来，其自振频率有明显的下降趋势。随着振动幅值的增大，结构的固有频率降低，阻尼比增大。据发现，在这种情况下，假地板提供没有贡献的刚度或阻尼的结构地板。在受控激励下，如一个人行走和一群人行走，地板的峰值响应进行了比较。给出了楼面在运行激励下的峰值响应，包括连续4年的年最大响应和不同人数下的最大响应。
Field tests were conducted on a unique long-span post-tensioned concrete floor between 2008 and 2013. The measurements cover the important construction stages including completion of the structural floor, installation of the false floor, completion of the whole building and opening the building to the public. This paper assesses the vibration performance of the floor using field measurements. Natural frequencies, damping ratios, mode shapes and modal masses of the floor were identified from ambient vibration measurements for eight different stages. A clear decreasing trend of the natural frequencies has been observed since 2009 when the building was opened to the public. Moreover, the natural frequencies decrease while the damping ratio increases with increasing vibration amplitude. It is found that, in this case, the false floor provides no contribution to the stiffness or the damping of the structural floor. Peak responses of the floor under controlled excitation, such as a single person walking and a group of people walking, are compared. Peak responses of the floor under operational excitation are presented, including the annual maximum response for four continuous years and the maximum responses for different numbers of occupants.