﻿ 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

Hans Journal of Civil Engineering
Vol.04 No.05(2015), Article ID:16077,9 pages
10.12677/HJCE.2015.45027

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

Bingruo Fan1, Gang Zong2, Bin Zhang2

1SINOPEC Shanghai Gaoqiao Company, Shanghai

2Research Institute of Structural Engineering and Disaster Reduction in College of Civil Engineering, Tongji University, Shanghai

Email: fanbingruo@sinogpc.com

Received: Sep. 1st, 2015; accepted: Sep. 17th, 2015; published: Sep. 23rd, 2015

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.

Keywords:Outside Air Condition Machines, Floor Vibration Measurement, Structure Vibration Reduction Analysis

1中国石油化工股份有限公司上海高桥分公司，上海

2同济大学土木工程学院，结构工程与防灾研究所，上海

Email: fanbingruo@sinogpc.com

1. 前言

2. 振动实测

2.1. 工程背景

2.2. 振动测试方案

Table 1. Measuring schedule

(a) (b)

Figure 1. (a) Measuring points of Case 1 on the top floor; (b) Measuring points of Case 2 on the roof

Figure 2. Measuring site

2.3. 实测数据分析

2.3.1. 信号时、频域特征分析

Figure 3. Vibration induced by ambient excitation of point 7#

2.3.2. 振动加速度级分析

(1)

Figure 4. Forced vibration sample of point 4# induced by outside machines

Figure 5. Standard level of vibration curve and the scatter plot of the measured vibration level

Table 2. The statistic VAL results (units: dB)

3. 结构减振分析

3.1. 数值模型分析

3.2. 减振方案探讨

Figure 6. The FEM model and the mode of 19 Hz

Figure 7. Typical numerical analysis results of the slab mid-span on 2nd floor

Figure 8. Changing curves of the vibration response in the center of the board on top floor along with the changing of the thickness of the board

Figure 9. Changing curve of the vibration response in the center of the board on top floor along with the changing of the size of the column

Table 3. Vibration reduction scheme

Table 4. The RMS of the board (unit: ×10 e−5 g)

Table 5. The RMS of the column (unit: ×10 e−5 g)

Table 6. The VAL of measuring sites (units: dB)

3.3. 优选减振方案

4. 结论

1) 实测表明空调外机运行引起楼盖振动的共振频率在19 Hz左右，其振动加速度级水平最大值为77.8 dB，超出国家振动标准 [8] (75 dB) 2~3 dB左右。

2) 本文提出五种减振方案，通过数值分析可见，楼(层)盖板振动响应的大小与楼板厚度、框架柱截面尺寸、空调外机开机数量等影响因素有关，其中空调外机开机数量对振动水平的影响比较小，而框架柱截面尺寸和楼板厚度对振动水平的影响比较大。

3) 综合考虑数值模型的计算分析结果和现场结构施工难易程度，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显著减小到73.2 dB，在国家振动标准规定值 [8] (75 dB)以下，说明该减振加固措施可行有效。

Floor Vibration Measurement Induced by Outside Air Condition Machines and Vibration Reduction Analysis[J]. 土木工程, 2015, 04(05): 215-223. http://dx.doi.org/10.12677/HJCE.2015.45027

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