空调外机致楼盖振动实测与减振分析

Floor Vibration Measurement Induced by Outside Air Condition Machines and Vibration Reduction Analysis

摘要: 本文以某一工程振动实测为背景，研究了大型中央空调系统引发的振动对建筑振动的影响，在进行振动现场实测及对实测信号时、频域和振动加速度级进行分析的基础上，采用有限元模型对不同结果减振方案对应的振动工况进行了数值模拟，提出了优化的结构减振方案，分析结果表明，框架柱截面尺寸和楼板厚度对振动水平的影响较大，建议顶层楼盖楼板厚度增为200 mm，此时的楼板振动响应水平减小至73.2 dB，满足现行规范要求。

Abstract: Based on an engineering vibration measurement, vibration influence research induced by outside air condition machines was done in this paper. Firstly, vibration measurement was carried out, and time domain, frequency domain as well as vibration acceleration level were analyzed. Secondly, the finite element model was used to analyze different working conditions and a comparison was made with the results from measurement. Finally, the preferred consolidation and vibration reduction scheme was given. The analysis results showed that the section of column and the thickness of floor slab are important structure parameters for vibration reduction. It is suggested that the slab thickness of top floor should be increased to 200 mm and then the vibration level will be decreased to 73.2 dB, satisfying the current specification requirements.