钢筋混凝土结构爆破地震响应频谱及幅值变化规律分析

陈士海;魏海霞;张子华;杜荣强

振动与冲击 ›› 2011, Vol. 30 ›› Issue (1) : 213-217.

PDF(1553 KB)
PDF(1553 KB)
振动与冲击 ›› 2011, Vol. 30 ›› Issue (1) : 213-217.
论文

钢筋混凝土结构爆破地震响应频谱及幅值变化规律分析

  • 陈士海;魏海霞;张子华;杜荣强
作者信息 +

Analysis on Variation Laws of Spectrum and Amplitude for Blasting Vibration Response of Reinforced Concrete Building

  • CHEN Shi-hai;WEI Hai-xia;ZHANG Zi-hua; DU Rong-qiang
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摘要

为探讨钢筋混凝土建筑结构的爆破地震效应特性,通过在隧道爆破开挖过程中下穿的多层钢筋混凝土建筑沿高度方向上布设测点,采集了大量的钢筋混凝土建筑的爆破地震响应信号。采用小波分析和快速傅立叶变换相结合的方法,研究各方向爆破地震波作用下钢筋混凝土建筑沿高度方向的结构响应频谱、能量分布特性及幅值变化规律。研究结果表明,爆破地震波作用下钢筋混凝土结构建筑物各层质点的速度响应信号频率较大且占有较大能量比例的优势频带较宽,集中在15Hz~600Hz;钢筋混凝土结构在垂向方向的速度响应信号频率要低于水平方向,在垂直方向的速度响应峰值高于水平方向,且比值一般随着楼层的升高有增大的趋势;垂向和水平方向的信号频谱特征和峰值速度响应随楼层变化无明显变化规律可循。

Abstract

To discuss characteristics of blasting vibration effects of reinforced concrete buildings, a large number of blasting vibration response signals of reinforced concrete building were monitored by locating measuring points on the multi-story reinforced concrete building along the height direction, which was under-drilled through in the course of blasting excavation of a tunnel. Distribution characteristics of spectrum and energy and amplitude variation laws of structural response of reinforced concrete building to the blasting seismic action along the height direction in all direction were studied with the method of wavelet analysis combined with FFT. The results indicate that the frequencies of velocity response signals of reinforced concrete buildings to blasting seismic waves are relatively large and the dominant frequency bands which occupy a large portion of total energy is wide which mainly focus on range of 15Hz~600Hz. The frequencies and amplitudes of velocity response signals of reinforced concrete buildings are individually lower and higher in vertical direction than in horizontal direction, and the ratio shows raising trend with the floor increasing. With the floor changing, characteristics of spectrum and amplitudes of structural response signals to the blasting seismic action in both vertical and horizontal direction change without obeying any laws.

关键词

钢筋混凝土结构 / 爆破地震响应 / 小波分析 / 频谱 / 幅值

Key words

reinforced concrete building / blasting vibration response / wavelet analysis / spectrum / amplitude

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陈士海;魏海霞;张子华;杜荣强. 钢筋混凝土结构爆破地震响应频谱及幅值变化规律分析[J]. 振动与冲击, 2011, 30(1): 213-217
CHEN Shi-hai;WEI Hai-xia;ZHANG Zi-hua;DU Rong-qiang. Analysis on Variation Laws of Spectrum and Amplitude for Blasting Vibration Response of Reinforced Concrete Building[J]. Journal of Vibration and Shock, 2011, 30(1): 213-217

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