Probabilistic Modeling of Walking Excitation for Building Floors
Probabilistic Modeling of Walking Excitation for Building Floors
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DOI：
10.1061/(asce)cf.1943-5509.0000005
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发表时间：
2009-05
影响因子：
2.5
通讯作者：
S. Z̆ivanović;A. Pavic
中科院分区：
文献类型：
--
作者：
S. Z̆ivanović;A. Pavic
细长楼板结构由于人的行走激励而变得越来越容易产生过度振动。为了防止楼层使用者的不适和/或敏感设备的故障，有必要在设计阶段有一个可靠的方法来估计地板的振动。为了准确地估计楼板振动，既需要可靠的激励，也需要结构模型。本文通过对现有作用力模型的性能评价和改进建议，对前者进行了重点研究。为此，混凝土协会在英国采用的力模型被应用于四个名义上相同的地板，使用它们实验识别的模态特性。通过与实验数据的对比，找出了力模型的不足之处，在此基础上，结合现有的两种分别用于低频和高频楼板的方法，提出了一种改进的步行诱导动态力模型。改进的模型考虑了步行力相对于起搏频率、步长和用力大小的受试者间的变异性。此外，它还将步行力的所有相关频率分量都纳入分析，从而消除了将楼层划分为低频率或高频的需要。建议的方法应该有助于设计者和建筑物业主在评估楼板结构的振动适用性时做出更明智的决定。
Slender floor structures are becoming increasingly prone to excessive vibration due to human-induced walking excitation. To prevent discomfort of floor occupants and/or malfunctioning of sensitive equipment, it is necessary to have a reliable means of estimating floor vibration in the design phase. For accurate estimation of the floor vibration, both reliable excitation and structural models are required. This paper concentrates on the former by evaluating the performance of the existing force models and suggesting their improvement. For this a force model adopted in the United Kingdom by the Concrete Society was applied to four nominally identical floors using their experimentally identified modal properties. After comparison with experimental data the drawbacks of the force model were identified after which an improved model of the walking-induced dynamic force, based on the combination of two existing methodologies used separately for low- and high-frequency floors, is proposed. The improved model accounts for the intersubject variability in the walking force with respect to the pacing frequency, step length, and forcing magnitude. Moreover, it includes all relevant frequency components of the walking force into analysis, removing the need for classification of floors as low or high frequency. The proposed approach should help designers and building owners to make more informed decisions when evaluating vibration serviceability of floor structures.