Wavelet Analysis on Vibrational Frequency Band Energy of Beam Bridge
under Near Blasting

doi:10.3969/j.issn.1674-0696.2014.01.06

Journal of Chongqing Jiaotong University(Natural Science) ›› 2014, Vol. 33 ›› Issue (1): 25-27.DOI: 10.3969/j.issn.1674-0696.2014.01.06

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Wavelet Analysis on Vibrational Frequency Band Energy of Beam Bridge under Near Blasting

Liu Dayang¹ , Huang Fuwei^1,2 , Liu Yiuling ¹, Liu Bo ¹, Xia Chao¹

1. School of Civil Engineering & Architecture , Chongqing Jiaotong University , Chongqing 400074 , China; 2. China Merchants Chongqing Communications Research & Design Institute Co. Ltd. ,Chongqing 400067 , China

Received:2012-12-03 Revised:2013-03-12 Online:2014-02-15 Published:2015-01-22

近区爆破下梁桥振动频带能量的小波分析

刘大洋¹，黄福伟^1,2，刘益铭¹，刘波¹，夏超¹

1. 重庆交通大学土木建筑学院，重庆400074 ;2. 招商局重庆交通科研设计院有限公司，重庆400067

作者简介:刘大洋(1986一) ，男，四川广元人，硕士研究生，主要从事桥梁健康与抗震方面的研究。E-mail:dayangxiong@163.com 。
基金资助:
国家重点基础研究发展计划基金项目(2012CB723807 )

Abstract

Abstract: Near blasting cause the vibration of continuous beam bridge. The inf1uence of explosion vibration on the bridge was evaluated which was helpful for the anti-explosion design of bridge. The vibration original signal was decomposed and reconstructed by the db8 wavelet basis based on the wavelet transform method. And the energy distribution of blasting vibration in each band was calculated. Based on the blast monitoring project under construction for South Branch Approach Bridge of Xia-Zhang Sea-Crossing Bridge , the space dynamic model of bridge was established and the modal was also analyzed to calculate the Hjh natural frequency. Signals related total 23 blasting were all processed by wavelet analysis. The results show that the main shock frequency band of the blasting vibration signal is in 15. 625 -62. 5 Hz , and the energy proportion in the first 9th natural vibration frequency band of the bridge is less than 5% of the overall energy.

Key words: near blasting, continuous beam bridge, wavelet transform, frequency band energy

摘要： 近区爆破引起的连续梁桥产生振动，评估爆破震动对桥梁产生的影响，为桥梁的抗爆设计提供参考依据。基于小波变换方法，采用db8 小波基对振动测试信号进行分解与重构，计算爆破震动在各个频带的能量分布。以厦漳跨海大桥南汉南引桥施工期爆破监测项目为依托，建立桥梁的空间动力分析模型并进行模态分析，计算桥梁的前 10 阶自振频率。对23 次爆破振动信号进行小波分析，结果表明，爆破振动信号的主震频带在15.625 - 62.5 Hz 内，桥梁的前9 阶固有自振频率所在频带能量小于总能量的5% 。

关键词: 爆破, 连续梁桥, 小波变换, 频带能量

CLC Number:

Liu Dayang , Huang Fuwei , Liu Yiuling , Liu Bo , Xia Chao. Wavelet Analysis on Vibrational Frequency Band Energy of Beam Bridge under Near Blasting[J]. Journal of Chongqing Jiaotong University(Natural Science), 2014, 33(1): 25-27.

刘大洋，黄福伟，刘益铭，刘波，夏超. 近区爆破下梁桥振动频带能量的小波分析[J]. 重庆交通大学学报（自然科学版）, 2014, 33(1): 25-27.

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Wavelet Analysis on Vibrational Frequency Band Energy of Beam Bridge under Near Blasting

近区爆破下梁桥振动频带能量的小波分析

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