Effects of full-height nonstructural partitions on modal properties of two nominally identical building floors
Effects of full-height nonstructural partitions on modal properties of two nominally identical building floors
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DOI：
10.1139/l09-055
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发表时间：
2009-07-01
影响因子：
1.4
通讯作者：
Reynolds, P.
中科院分区：
文献类型：
--
作者：
Miskovic, Z.;Pavic, A.;Reynolds, P.
本文提出了一种结合试验和数值研究的模态特性的两个足尺和名义上相同的钢-混凝土组合楼盖。在同一座全面运作的多层建筑中，楼层一层接一层。两层楼都设有开放式和分区办公室。采用多输入多输出（MIMO）模态试验对两层结构的竣工模态特性进行了测试。结果发现，两个名义上相同的地板有不同的模态特性，可能是由于地板中的分区的不同布置。还发现，两个楼层上的测量模式都经历了相当复杂的程度，这可能是由非比例阻尼引起的。在ANSYS中使用最佳工程判断为两个楼层开发了有限元（FE）模型，然后调整其特征和属性以匹配测量对应物。通过试错法手动进行调整，然后使用FEMTools软件中实现的基于灵敏度的FE模型更新程序自动进行调整。结果发现，初始和几何上非常详细的有限元模型，没有任何非结构部件，低估了测量的固有频率高达20%-25%，这取决于地板水平。当全高石膏板和玻璃隔断被明确建模为垂直弹簧连接到地板和接地的另一端，实验和有限元结果之间的相关性大大提高。
This paper presents a combined experimental and numerical investigation of the modal properties of two fullscale and nominally identical steel-concrete composite floors. The floors were one above the other in the same fully operational multi-storey building. Both floors accommodated open-plan as well as partitioned offices. Multi-input-multi-output (MIMO) modal testing was employed to measure as-built modal properties of both floors. It was found that the two nominally identical floors had different modal characteristics, likely due to the different arrangement of partitions in the floor. It was also found that the measured modes on both floor levels experienced a considerable level of complexity, likely to be caused by nonproportional damping. Finite element (FE) models were developed in ANSYS for both floors using best engineering judgement and their features and properties were then tuned to match the measured counterparts. The tuning was done manually by trial-and-error and then automatically using sensitivity-based FE model updating procedure implemented in the FEMtools software. It was found that the initial and geometrically very detailed FE models, which did not feature any nonstructural components, underestimated the measured natural frequencies by up to a considerable 20%-25%, depending on the floor level. When full-height plasterboard and glass partitions were explicitly modelled as vertical springs connected to the floor and grounded at the other end, the correlation between the experimental and FE results improved considerably.