Abstract We show how complex, three-dimensional modes of vibration of an irregular building can be identified by ambient vibration measurements. We present two-dimensional cross sections of the three-dimensional mode shapes and describe a measuring strategy for identifying the building properties when the excitation consists of nonstationary microtremors and short and weak wind bursts. We employ cross-correlations of measured accelerations to identify predominance of excitation by microtremors (causing wave propagation from the ground up into the building), or by weak bursts of wind (wave propagation within the building and down towards the foundation). We describe the two lowest frequencies of vibration at 10.5 Hz and at 11.9 Hz and their mode shapes.

中文翻译：

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不规则建筑物中的环境振动测量

摘要 我们展示了如何通过环境振动测量来识别不规则建筑物的复杂的三维振动模式。我们展示了三维模式形状的二维横截面，并描述了一种测量策略，用于在激励由非平稳微震和短而微弱的风爆发组成时识别建筑特性。我们采用测量加速度的互相关来确定微震（导致波从地面向上传播到建筑物）或微弱的风爆发（波在建筑物内传播并向下传播到地基）引起的主要激励。我们描述了 10.5 Hz 和 11.9 Hz 的两个最低振动频率及其模式形状。