分层土-箱基-框架结构在爆破地震作用下的计算分析
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摘要
以野外大比例(1∶2)分层土–箱基–框架结构试验模型的爆破震动试验数据为基础,利用有限元软件ANSYS二次开发语言apdl二次开发,将多次透射公式(MTF)添加到软件中从而实现对无限域的模拟,进而利用整体动力有限元方法研究人工透射边界、箱基周围回填土属性、软弱夹层及地震波主频范围等参数对上部框架动力反应的影响。数值算例与试验结果对比表明:爆破震动作用下,考虑二阶透射边界的数值结果和试验结果吻合较好,能模拟结构的真实动力反应,而固定边界和固基假定的计算结果偏大;箱基埋置深度浅、下卧土层刚度较大时,箱基周围回填土属性对结构反应影响不大;场地土中的软弱夹层对上部结构起到隔振减震的作用;与高频爆破地震波相比,低频地震波所产生的结构加速度反应更大,对结构破坏作用更强;固基假定下的结构反应计算结果在一些特定情况下并不总偏安全。
Experimental researches on a large-scale(1:2) in-situ model test of layered soil-box foundation-structure system to study the dynamic interaction under explosive earthquake waves were carried out.By applying a secondary development to ANSYS with multi-transmitting boundary,the effects of artificial transmitting boundary(ATB),property of backfilled soil,the weak intercalation and main frequency range on superstructure were comprehensively investigated.Compared with the results of fixed soil boundary and fixed base boundary,the results of ATB agreed well with the test results.Stiffness variation of backfilled soil played a small role on superstructure response when the substratum was relative stiff and the box foundation embedment was shallow.The weak intercalation could reduce the seismic response of superstructure.Acceleration and damage of superstructure under low frequency earthquake was larger than that under high frequency blast earthquake.At the same time,in some special cases,the computed results under the fixed base assumption were not always on the safeside.
Experimental researches on a large-scale(1:2) in-situ model test of layered soil-box foundation-structure system to study the dynamic interaction under explosive earthquake waves were carried out.By applying a secondary development to ANSYS with multi-transmitting boundary,the effects of artificial transmitting boundary(ATB),property of backfilled soil,the weak intercalation and main frequency range on superstructure were comprehensively investigated.Compared with the results of fixed soil boundary and fixed base boundary,the results of ATB agreed well with the test results.Stiffness variation of backfilled soil played a small role on superstructure response when the substratum was relative stiff and the box foundation embedment was shallow.The weak intercalation could reduce the seismic response of superstructure.Acceleration and damage of superstructure under low frequency earthquake was larger than that under high frequency blast earthquake.At the same time,in some special cases,the computed results under the fixed base assumption were not always on the safeside.
引文
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[2]DOMIGUEZ J.Boundary elements in dynamics[M].Southampon:Computational Mechanics Publications,1993.
[3]MEDINA F,TAILO R,Finite element technicals for unbounded domains[J].Int J Nume Methods in Engi,1983,19(4):1209–1226.
[4]LYSMER J,KULEMEYER R L.Finite dynamic model for infinite media[J].Journal of Engng Mech Div,ASCE,1969,95:859–877.
[5]CLAYTON R,ENGQUIST B.Absorbing boundary conditions for wave-equation migration[J].Geophysics,1980,45:895–904.
[6]廖振鹏,黄孔亮,杨柏坡,等.暂态波透射边界[J].中国科学(A辑),1984,26(6):50–56.(LIAO Zhen-peng,HUANG Kong-liang,YANG Bai-po,et al.A transmitting boundary for transient wave analyses[J].Scientia Sinica(Series A),1984,26(6):50–56.(in Chinese))
[7]廖振鹏.工程波动理论导论[M].(第二版).北京:科学出版社,2002.(LIAO Zhen-peng.Introduction to wave motion theories for engineering[M].2nd ed.Beijing:Science Press,2002.(in Chinese))
[8]熊辉.层状场域内上、下部结构动力相互作用分析及其优化设计[D].湖南大学,2003.(XIONG Hui.The investigation of supstructure-substructure dynamic interaction and dynamic optimization design[D].Changsha:Hunan University,2003.(in Chinese))
[9]陈国兴,陈继华,等.地震动输入界面的选取对深软场地地震效应的影响[J].世界地震工程,2005,21(2):36–43.(CHEN Guo-xing,CHEN Ji-hua,et al.A study on the influence of seismic wave inputing interface on the earthquake response of deep soft sites[J].Word Earthquake Engineering,2005,21(2):36–43.(in Chinese))
[10]薄景山,翟庆生,等.基于土层结构的场地分类方法[J].地震工程与工程振动,2004,24(4):46–49.(BO Jing-shan,ZHAI Qing-sheng,et al.Site classification method based on soil layer construction[J].Earthquake Engineering and Engineering Vibration,2004,24(4):46–49.(in Chinese))
[11]陈国兴,陈继华.软弱土层的厚度及埋深对深厚软弱场地地震效应的影响[J].世界地震工程,2004,20(3):66–73.(CHEN Guo-xing,CHEN Ji-hua.The effect of depth and thickness of soft soil layer on earthquake response for deep soft sites[J].Word Earthquake Engineering,2004,20(3):66–73.(in Chinese))
[12]钱胜国.软土夹层地基场地土层地震反应特性的研究[J].工程抗震,1994,1:32–36.(QIAN Shen-guo.A study on earthquake response properties of soil with weak intercalation[J].Earthquake Resistant Engineering,1994,1:32–36.(in Chinese))
[13]张萍,蒋秀琴,等.爆破、矿震与地震的波谱差异[J].地震地磁观测与研究,2005,26(3):24–34.(ZHANG Ping,JIANG Xiu-qin,et al.The differences of wave spectrum among explosion,mine tremor and earthquake[J].Seismological and Geomagnetic Observation and Research,2005,26(3):24–34.(in Chinese))
[14]黄忆龙.爆破地震波及其传播特性研究[D].徐州:中国矿业大学,2000.(HUANG Yi-long.Researches on the blasting seismic wave and the wave propagation characters[D].Xuzhou:China University of Mining&Technology,2000.(in Chinese))
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