定点锤击及现场列车作用下浮筑隔振效果对比试验及预测方法研究

李昊; 杨维国; 邹晓光; 刘佩; 王萌

doi:10.6052/j.issn.1000-4750.2021.06.0495

定点锤击及现场列车作用下浮筑隔振效果对比试验及预测方法研究

doi: 10.6052/j.issn.1000-4750.2021.06.0495

李昊^1,,
杨维国^1, ,,
邹晓光^1,,
刘佩^{1, 2,},
王萌^1,

1.
北京交通大学土木建筑工程学院，北京 100044
2.
北京交通大学结构风工程与城市风环境北京市重点实验室，北京 100044

基金项目: 国家重点研发计划项目(2019YFC1521000)；中央高校基本科研业务费专项资金资助项目(2020YJS120，2020JBZ110)

详细信息

作者简介:
李　昊(1993−)，男，浙江人，博士生，主要从事交通致结构振动的抗振、减隔振研究(E-mail: 18115027@bjtu.edu.cn)

邹晓光(1995−)，男，湖北人，博士生，主要从事交通致结构振动的抗振、减隔振研究(E-mail: 20115035@bjtu.edu.cn)

刘　佩(1982−)，女，河北人，副教授，博士，主要从事结构减隔振(震)理论和设计方法研究(E-mail: peiliu@bjtu.edu.cn)

王　萌(1985−)，女，黑龙江人，教授，博士，主要从事结构减隔振(震)理论和设计方法研究(E-mail: wangmeng1117@gmail.com)

通讯作者:
杨维国(1973−)，男，山西人，教授，博士，主要从事结构减隔振(震)理论和设计方法研究(E-mail: wgyang1@bjtu.edu.cn)

中图分类号: X827
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- HTML全文浏览量: 69
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- 被引次数: 0
出版历程
- 收稿日期: 2021-06-30
- 录用日期: 2021-12-10
- 修回日期: 2021-11-10
- 网络出版日期: 2021-12-10
- 刊出日期: 2022-11-01

COMPARATIVE TEST AND PREDICTION METHOD STUDY ON VIBRATION ISOLATION EFFECT OF FLOATING SLAB UNDER FIXED-POINT HAMMERING AND ON-SITE TRAIN

LI Hao^1
,,
YANG Wei-guo^{1
, ,},
ZOU Xiao-guang^1
,,
LIU Pei^{1, 2
,},
WANG Meng^1
,

1.
School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
2.
Beijing’s Key Laboratory of Structural Wind Engineering and Urban Wind Environment, Beijing Jiaotong University, Beijing 100044, China

摘要

摘要: 通过现场及线下试验，测试了整体浮筑隔振措施在实际列车激励与定点锤击激励下的振动响应，分析了2种荷载激励下隔振效果的差异，并对定点锤击激励的有效性和准确性进行评价。结果表明：列车及定点锤击荷载激励下，浮筑隔振可显著减小振动加速度响应；两种荷载激励下，浮筑隔振体系的特征峰值和各频段能量分布走势相近。锤击激励下的计权Z振级隔振量略低于列车激励，其隔振效果偏于保守，可见，针对浮筑隔振系统的效果评价，实际列车激励方式要优于定点锤击激励方式。结合理论及试验分析，提出针对受振体柔性支撑浮筑隔振体系的隔振效果预测方法，可为类似隔振措施的评估和比选提供参考。
- 锤击激励 /
- 隔振 /
- 现场试验 /
- 预测方法 /
- 振动响应
Abstract: Through field and off-line tests, the vibration responses of the integral floating vibration isolation measures under the train excitation and fixed-point hammering excitation were tested, the differences of vibration isolation effects under the two kinds of load excitations were analyzed, and the effectiveness and accuracy of fixed-point hammering excitation was evaluated. The study results showed that: under the train and fixed-point hammering excitations, the vibration acceleration response of the floating isolation system could be significantly reduced. The characteristic peak value and energy distribution trend of the floating vibration isolation system under the two kinds of load excitations were similar. The vibration isolation quantity of weighted Z-Level under a hammering excitation was lower than that under a train excitation, and its vibration isolation effect was conservative. It could be seen that the actual train incentive mode is better than the fixed-point hammering incentive mode. A prediction method of vibration isolation effect for a flexible supported floating vibration isolation system was proposed, combined with the theoretical and experimental analysis, which can provide a reference for the evaluation and comparison of similar vibration isolation measures.
- hammering excitation /
- vibration isolation /
- field test /
- prediction method /
- vibration response

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图 1 隔振体系计算模型

Figure 1. Calculation model of vibration isolation system

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图 2 振动传递比

Figure 2. Vibration transfer ratio

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图 3 浮筑隔振系统参数取值流程图

Figure 3. Flow chart for parameter selection of floating vibration isolation system

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图 4 浮筑隔振体系示意图

Figure 4. Floating vibration isolation system

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图 5 定点锤击与列车激励示意图

Figure 5. Schematic diagram of fixed-point hammering and train excitation

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图 6 列车激励下典型加速度响应时程

Figure 6. Typical acceleration response time history under train excitation

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图 7 列车激励下典型加速度响应频谱

Figure 7. Typical frequency spectrum under train excitation

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图 8 锤击激励下典型加速度响应时程

Figure 8. Typical acceleration response time history under hammering excitation

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图 9 锤击激励下典型加速度响应频谱

Figure 9. Typical frequency spectrum under hammering excitation

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图 10 1/3倍频程曲线及包络范围

Figure 10. 1/3 octave curve and envelope range

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图 11 不同荷载激励下隔振效果

Figure 11. Vibration isolation effect under under different excitation

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图 12 不同锤击力作用下振动响应

Figure 12. Vibration response under different hammering forces

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图 13 不同锤击力作用下振级及隔振效果

Figure 13. Vibration level and vibration isolation effect under different hammering force

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图 14 预测方法流程图

Figure 14. Flow chart of prediction method

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图 15 建筑物与地铁空间关系图

Figure 15. Spatial relationship between building and metro

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图 16 实测隔振前后加速时程及频谱对比

Figure 16. Measured acceleration time history and frequency spectrum before and after vibration isolation

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图 17 各频段振级实测及预测值对比

Figure 17. Comparison of measured and predicted vibration levels in different frequency bands

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表 1 钢弹簧参数

Table 1. Parameters of steel spring

型号	高度/ mm	外径/ mm	有效行程/ mm	刚度/ (N/mm)	阻尼比	计算频率/ Hz
#1	50	30	25	57.0	0.03	9.7
#2	60	30	30	47.4	0.03	8.8
#3	40	20	20	31.6	0.03	7.3

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表 2 不同激励下Z振级隔振量级

Table 2. Vibration isolation magnitude of Z vibration level under different excitation

测次	1号钢弹簧/dB		2号钢弹簧/dB		3号钢弹簧/dB
测次	锤击激励	列车激励	锤击激励	列车激励	锤击激励	列车激励
1	4.0	5.9	2.0	5.3	4.1	1.6
2	3.3	4.9	3.8	2.2	5.1	7.0
3	1.5	3.6	1.3	5.2	1.9	2.9
4	2.4	3.4	5.9	3.4	4.4	7.9
5	3.1	2.6	2.9	3.9	3.7	5.6
均值	2.9	4.1	3.2	4.0	3.8	5.1

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表 3 不同锤击力作用下振动量级及隔振量

Table 3. Vibration response and vibration isolation under different hammering forces

锤击高度/cm	振动量级$V_{{\rm{L}}_Z} $/dB		隔振量$V_{{\rm{L}}_I} $/dB
锤击高度/cm	硬质钢块	钢弹簧	隔振量$V_{{\rm{L}}_I} $/dB
20	65.4	62.1	3.3
25	66.8	63.2	3.6
30	68.6	64.8	3.8
35	71.1	67.6	3.5

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表 4 Z振级及隔振量对比

Table 4. Comparison of Z vibration level and vibration isolation

测点	参量	隔振前/dB	隔振后/dB	隔振量/dB
测点P	实测值	54.8	49.4	5.4
	预测值	54.8	49.8	5.0
	误差	—	0.4	0.4
测点Q	实测值	54.4	48.7	5.7
	预测值	54.4	49.3	5.1
	误差	—	0.6	0.6

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