芦山地震烈度异常区的场地特征与震害相关性
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摘要
2013年4月20日芦山地震中天权县思经乡出现了地震烈度VIII度异常区。基于地脉动测试技术,本文研究了思经乡异常区的出现与场地条件间的关系。首先调查了思经乡的地形、地貌和地质条件等场地特征,发现思经乡第四季土层覆盖较薄,下层为颗粒较大的砾石和鹅卵石等,是良好的民用双层建筑建设场地。然后,通过地脉动测试技术,分别测试了思经乡部分场地和民居的特征频率,发现思经乡场地特征频率与现有民用两层建筑特征频率相近。这种情况对建筑物抗震性能的发挥极为不利,可被初步认定为思经乡异常区产生的主要原因。
The Sijing town is an abnormality intensity area( VIII) in Lushan earthquake on April 4th,2013.Based on the micro-tremor testing technique,the relationship between the abnormality intensity area and the site conditions is studied. First,the site conditions of the Sijing town are investigated,and we find that the sites are perfect for the constructions of the duplex apartments. Then,by using the micro-tremor testing technique,the predominant frequencies of the buildings and sites around the hope primary school are given,respectively. We find that the predominant frequencies of the duplex apartments are similar to those of the sites. This condition does not benefit the architectural security,and we believe that this is the main reason,which cause the occurrence of the high-intensity abnormality area.
The Sijing town is an abnormality intensity area( VIII) in Lushan earthquake on April 4th,2013.Based on the micro-tremor testing technique,the relationship between the abnormality intensity area and the site conditions is studied. First,the site conditions of the Sijing town are investigated,and we find that the sites are perfect for the constructions of the duplex apartments. Then,by using the micro-tremor testing technique,the predominant frequencies of the buildings and sites around the hope primary school are given,respectively. We find that the predominant frequencies of the duplex apartments are similar to those of the sites. This condition does not benefit the architectural security,and we believe that this is the main reason,which cause the occurrence of the high-intensity abnormality area.
引文
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[3]Anderson JG,Bodin P,Brune JN,et al.Strong ground motion from the Michoacfin.Mexico earthquake.Science,1986,233:1043-1048.
[4]陶夏新,刘曾武,郭明珠,等.工程场地条件评定中的地脉动研究[J].地震工程与工程振动,2001,21:18-23.TAO XX,LIU ZW,GUO MZ,et al.A review of microtremor study in engineering site rating[J].Journal of Earthquake Engineering and Engineering Vibration,2013,33:1-14.(in Chinese)
[5]温瑞智,任叶飞,齐文浩,等.2013年4月20日芦山地震最大加速度记录分析[J].西南交通大学学报,2013,48:783-791.WEN RZ,REN YF,Qi WH,et al.Strong motion records and their engineering damage implications for Lushan earthquake on april 20,2013[J].Journal of Earthquake Engineering and Engineering Vibration,2013,33:1-14.(in Chinese)
[6]Bard PY.Microtremors measurements:a tool for site effect estimation[C].ESG,Symposium,1998.
[7]Atakan K,Duval AM,Theodulidis N,et al.The H/V spectral ration technique:experimental conditions,data processing and empirical reliability assessment[C]//13th Word Conference on Earthquake Engineering,2004,Paper NO.2268.
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