地震动入射角度对地下结构地震响应的影响
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摘要
考虑土-结构接触面效应和场地初始静应力影响,基于大型商用有限元软件ANSYS和粘弹性人工边界条件,采用动力松弛法的分析思路,建立了一种地震动斜入射条件下地下结构的接触非线性动力反应分析模型和方法,并讨论了地震动入射角度对地下结构动力反应的影响。结果表明:地震波斜入射使得结构的整体反应发生明显变化;随着入射角度的增加,节点的水平向应力反应明显增大,竖向应力峰值较小,增大程度也相对较小;节点的位移峰值随输入加速度峰值的增大也有一定的变化。因此,在分析近源地震作用下的地下结构动力响应时,需要考虑地震动的非一致输入问题。
Based on the visco-elastic artificial boundary and the finite element software ANSYS,seismic response of underground structures under oblique incidence is analyzed,considering the contact effect between soil and structures and the initial stress in site.The effect of obliquely incident seismic waves on dynamic response of underground structure is studied.The calculated results show that obliquely incident seismic waves make significant changes on the overall reaction of the structure.With the increase of incident angle,the horizontal stress of nodes increases significantly,and the peak vertical stress and the increment of the stress are all small.With the increase of input peak acceleration,the peak displacements of nodes have certain changes.Therefore,the effects of obliquely incident seismic wave need to be considered while analyzing the seismic response of underground structures near the epicenter.
Based on the visco-elastic artificial boundary and the finite element software ANSYS,seismic response of underground structures under oblique incidence is analyzed,considering the contact effect between soil and structures and the initial stress in site.The effect of obliquely incident seismic waves on dynamic response of underground structure is studied.The calculated results show that obliquely incident seismic waves make significant changes on the overall reaction of the structure.With the increase of incident angle,the horizontal stress of nodes increases significantly,and the peak vertical stress and the increment of the stress are all small.With the increase of input peak acceleration,the peak displacements of nodes have certain changes.Therefore,the effects of obliquely incident seismic wave need to be considered while analyzing the seismic response of underground structures near the epicenter.
引文
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[2]王军文,张运波,李建中,等.地震动行波效应对连续梁桥纵向地震碰撞反应的影响[J].工程力学, 2007,24(11):100-105. Wang J W,Zhang Y B,Li J Z,et al.Seismic wave passage effect's influences on longitudinal seismic pounding response for continuous girder bridges[J]. Engineering Mechanics,2007,24(11):100-105.
[3]苏成,陈海斌.多点激励下大跨度桥梁的地震反应[J].华南理工大学学报(自然科学版),2008,36 (11):101-107. Su C,Chen H B.Seismic response of long-span bridge under multi-support excitation[J].Journal of South China University of Technology(Natural Science Edition),2008,36(11):101-107.
[4]梁嘉庆,叶继红.多点输入下大跨度空间网格结构的地震响应分析[J].东南大学学报(自然科学版), 2003,33(5):625-630. Liang J Q,Ye J H.Seismic response analysis of long-span space lattice structures under multiple-support excitation[J].Journal of Southeast University (Natural Science Edition),2003,33(5):625-630.
[5]张静娟,高大峰,刘伯栋.多跨连续梁桥地震行波效应分析[J].水利与建筑工程学报,2009,7(2):114- 116. Zhang J J,Gao D F,Liu B D.Seismic response analysis for continuous beam bridge under excitation of traveling waves[J].Journal of Water Resources and Architectural Engineering,2009,7(2):114-116.
[6]岳庆霞,李杰.地下综合管廊地震响应研究[J].同济大学学报(自然科学版),2009,37(3):285-290. Yue Q X,Li J.Research on utility tunnel seismic response[J].Journal of Tongji University(Natural Science),2009,37(3):285-290.
[7]刘金云,陈健云,胡志强.输水隧道在行波激励下的??三维地震反应分析[J].防灾减灾工程学报,2007,27 (1):11-16. Liu J Y,Chen J Y,Hu Z Q.Three-dimensional seismic response analysis for water-supplying tunnel under excitation of traveling waves[J].Journal of Disaster Prevention and Mitigation Engineering, 2007,27(1):11-16.
[8]李山有,王学良,周正华.地震波斜入射情形下水平成层半空间自由场的时域计算[J].吉林大学学报(地球科学版),2003,33(3):372-376. Li S Y,Wang X L,Zhou Z H.The time-step numerical simulation of free field motion of layered half-space for inclined seismic waves[J].Journal of Jilin University(Earth Science Edition),2003,33 (3):372-376.
[9]赵建锋,杜修力,韩强,等.外源波动问题数值模拟的一种实现方式[J].工程力学,2007,24(4):52-58. Zhao J F,Du X L,Han Q,et al.An approach to numerical simulation for external source wave motion [J].Engineering Mechanics,2007,24(4):52-58.
[10]杜修力,陈维,李亮,等.斜入射条件下地下结构时域地震反应分析初探[J].震灾防御技术,2007, 2(3):290-296. Du X L,Chen W,Li L,et al.Preliminary study of time-domain seismic response for underground structures to obliquely incident seismic waves[J]. Technology for Earthquake Disaster Prevention, 2007,2(3):290-296.
[11]尤红兵,赵凤新,荣棉水.地震波斜入射时水平层状场地的非线性地震反应[J].岩土工程学报,2009,31 (2):234-240. You H B,Zhao F X,Rong M S.Nonlinear seismic response of horizontal layered site due to inclined wave[J].Chinese Journal of Geotechnical Engineering,2009,31(2):234-240.
[12]王琴,陈隽,李杰.斜入射地震波作用下地下管线的地震反应分析[J].华中科技大学学报(城市科学版),2008,25(4):283-286. Wang Q,Chen J,Li J.Seismic response analysis of underground pipeline under obliquely incident seismic waves[J].Journal of Huazhong University of Science and Technology(Urban Science Edition),2008,25 (4):283-286.
[13]杜修力.工程波动理论与方法[M].北京:科学出版社,2009. Du X L.Theories and Methods of Wave Motion for Engineering[M].Beijing:Science Press,2009.
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