冻土层对桥梁地震反应的影响
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摘要
采用波动法对季节性冻土区和多年冻土区的桥梁结构进行了地震反应分析。研究了冻土层的变化对桥梁结构地震反应的影响。得到了不同冻土厚度、不同墩高时桥墩地震内力分布的规律。计算结果表明,冻土层的存在对桥梁的地震反应具有显著影响,不同基础类型桥墩受冻土的影响规律基本相同,墩高在10m~22m之间时冻土层对桥墩地震反应的影响最为显著。桥墩的地震反应在冬夏两季具有显著区别,抗震设计中应考虑不同季节的影响。
Wave motion method is used to calculate the seismic response of bridges in seasonal frozen or permafrost regions. The effect of frozen soil layer on the seismic response of bridges is studied. The seismic force distribution on bridge piers is obtained for various conditions of frozen soil thickness and height of bridge piers. The calculation results indicate that the frozen soil layer has remarkable effect on the seismic response of bridges. The influential law of frozen soils on the bridge pier with different kinds of foundations is similar. The effect of frozen soils on the seismic response of bridge piers is prominent with the height of the bridge pier ranging from 10 to 22 meters. The seismic response of bridge piers in winter and summer seasons has remarkable distinction. The seasonal effect should be considered in the seismic design of bridges.
Wave motion method is used to calculate the seismic response of bridges in seasonal frozen or permafrost regions. The effect of frozen soil layer on the seismic response of bridges is studied. The seismic force distribution on bridge piers is obtained for various conditions of frozen soil thickness and height of bridge piers. The calculation results indicate that the frozen soil layer has remarkable effect on the seismic response of bridges. The influential law of frozen soils on the bridge pier with different kinds of foundations is similar. The effect of frozen soils on the seismic response of bridge piers is prominent with the height of the bridge pier ranging from 10 to 22 meters. The seismic response of bridge piers in winter and summer seasons has remarkable distinction. The seasonal effect should be considered in the seismic design of bridges.
引文
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[2]郭恩栋,王东升,陆鸣.青新交界8.1级地震生命线工程震害[J].地震工程与工程振动,2002,22(3):77~81.Guo Endong,Wang Dongsheng,Lu Ming.Damage to lifelines during MS8.1earthquake near Qinghai-Xinjiang border[J].Earthquake Engineering and Engineering Vibration,2002,22(3):77~81.(in Chinese)
[3]徐学燕,仲丛利.冻土的动力特性研究及其参数确定[J].岩土工程学报,1998,20(5):77~81.Xu Xueyan,Zhong Congli.Research on dynamic characters of frozen soil and determination of its parameters[J].Chinese Journal of Geotechnical Engineering,1998,20(5):77~81.(in Chinese)
[4]孙建刚,王莉莉,魏志真.季节性冻土层对立式储罐地震反应的影响[J].世界地震工程,2003,19(4):121~126.Sun Jiangang,Wang Lili,Wei Zhizhen.Influence of seasonally frozen ground on the seismic response of tanks[J].World Earthquake Engineering,2003,19(4):121~126.(in Chinese)
[5]王兰民,张冬丽,吴志坚,马巍.地温对冻土动力特性及其场地地震动参数的影响[J].中国地震,2003,19(3):195~205.Wang Lanmin,Zhang Dongli,Wu Zhijian,Ma Wei.The Influence of earth temperature on dynamic characteristics of frozen soil and the parameters of ground motion on the sites of frozen soil[J].Earthquake Research in China,2003,19(3):195~205.(in Chinese)
[6]刘鸿绪,孙彦福,陈亚明,徐学燕,印艳华.季节冻土层对房屋地震破坏的影响[J].冰川冻土,1998,20(1):46~50.Liu Hongxu,Sun Yanfu,Chen Yaming,Yin Yanhua.Influence of seasonally frozen ground on the seismic damages of buildings[J].Journal of Glaciology and Geocryology,1998,20(1):46~50.(in Chinese)
[7]邱玉洁,杨玉成,刘鸿绪.冻土层对多层砖房动力特性的影响[J].世界地震工程,1996,4:51~54.Qiu Yujie,Yang Yucheng,Liu Hongxu.Effects on frozen soils on response of multistory brick buildings[J].World Earthquake Engineering,1996,4:51~54.(in Chinese)
[8]赖远明,吴紫汪,朱元林,朱林楠.寒区隧道地震响应的弹粘塑性分析[J].铁道学报,2000,22(6):84~89.Lai Yuanming,Wu Ziwang,Zhu Yuanlin,Zhu Linnan.Elastic visco-plastic analysis for earthquake response of tunnels in cold regions[J].Journal of the China Railway Society,2000,22(6):84~89.(in Chinese)
[9]Vaziri H,Han Y.Full-scale filed studies of the dynamic response of piles embedded in partially frozen soil[J].Canadian Geotechnical Journal,1991,28:708~718.
[10]陈兴冲,高峰,严松宏,王常峰.多年冻土区桥梁的地震反应[J].世界地震工程,2005,21(4):26~31.Chen Xingchong,Gao Feng,Yan Songhong,Wang Changfeng.Seismic response of bridges in the permafrost region[J].World Earthquake Engineering,2005,21(4):26~31.(in Chinese)
[11]廖振鹏.工程波动理论导引(第二版)[M].北京:科学出版社,1996.Liao Zhenpeng.Introduction to wave motion theories in engineering(Second Edition)[M].Beijing:Science Press,1996.(in Chinese)
[12]刘晶波,吕彦东.结构-地基动力相互作用问题分析的一种直接方法[J].土木工程学报.1998,3:55~64.Liu Jingbo,Lu Yandong.A direct method for analysis of dynamic soil-structure interaction[J].China Civil Engi-neering Journal,1998,3:55~64.(in Chinese)
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