地震动斜入射对桩-土-网壳结构地震响应影响
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摘要
基于粘弹性边界基本理论,结合大型有限元软件ABAQUS和FORTRAN程序,采用时域波动方法实现粘弹性人工边界的地震动斜入射,并建立桩-土-单层柱面网壳结构的三维整体计算模型,研究在考虑桩-土-结构动力相互作用(PSSI)下地震动输入方向对单层柱面网壳结构地震响应的影响。研究表明:当入射角度在40°~60°时,桩体的地震响应大于土体的地震响应,同时边桩的地震响应大于内桩地震响应;桩-土-单层柱面网壳结构体系的地震响应未必在地震动垂直入射时最大,整体结构体系的水平地震响应在入射角为45°~60°时出现最大值;在进行地震分析时宜考虑地震动入射角度对桩-土-单层柱面网壳结构体系地震响应的影响。
The time-domain wave method is adopted to achieve oblique incidence of earthquake waves based on the basic theory of viscoelastic boundary,combining with ABAQUS and FORTRAN program.A three-dimensional finite element integral computation model is established.The integral computation model consists of single layer reticulated cylindrical shell,pile and foundation soil.The seismic responses of the single layer reticulated cylindrical shell are analyzed considering different incidence angles of earthquake waves and pile-soil-structure interaction(PSSI).The results indicate that the seismic response of the piles is larger than the soil under the action of seismic waves with the range of incidence angel from 40°to 60°,and the seismic response of the outside piles is greater than the inner piles.The seismic response of the pile-soil-single layer reticulated cylindrical shell is not always the largest for the vertical incidence of earthquake waves.The horizontal seismic response of pile-soil-single layer reticulated cylindrical shell appears maximum values under the action of seismic waves with the range of incidence angel from 45°to 60°.The effects of different incidence angles of earthquake waves on the pile-soil-single layer reticulated cylindrical shell should be considered in seismic analysis.
The time-domain wave method is adopted to achieve oblique incidence of earthquake waves based on the basic theory of viscoelastic boundary,combining with ABAQUS and FORTRAN program.A three-dimensional finite element integral computation model is established.The integral computation model consists of single layer reticulated cylindrical shell,pile and foundation soil.The seismic responses of the single layer reticulated cylindrical shell are analyzed considering different incidence angles of earthquake waves and pile-soil-structure interaction(PSSI).The results indicate that the seismic response of the piles is larger than the soil under the action of seismic waves with the range of incidence angel from 40°to 60°,and the seismic response of the outside piles is greater than the inner piles.The seismic response of the pile-soil-single layer reticulated cylindrical shell is not always the largest for the vertical incidence of earthquake waves.The horizontal seismic response of pile-soil-single layer reticulated cylindrical shell appears maximum values under the action of seismic waves with the range of incidence angel from 45°to 60°.The effects of different incidence angles of earthquake waves on the pile-soil-single layer reticulated cylindrical shell should be considered in seismic analysis.
引文
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[2]Takahiro S.Estimation of earthquake motion incident angle at rock site[A].Proceedings of 12th World Conference Earthquake Engineering[C].New Zealand,2000:1—8.
[3]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.
[4]郜新军,赵成刚,刘秦.地震波斜入射下考虑局部地形影响和土-结构相互作用的多跨桥动力响应分析[J].工程力学,2011,28(11):237—243.Gao X J,Zhao C G,Liu Q.Seismic response analysis of multi-span viaduct considering topographic effect and soil-structure dynamic interaction based on inclined wave[J].Engineering Mechanics,2011,28(11):237—243.
[5]王琴,陈隽,李杰.斜入射地震波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.
[6]赵源,杜修力,李立云.地震动入射角度对地下结构地震响应的影响[J].防灾减灾工程学报,2010,30(6):624—630.Zhao Y,Du X L,Li L Y.The effect of obliquely incident seismic waves on dynamic response of underground structure[J].Journal of Disaster Prevention and Mitigation Engineering,2010,30(6):624—630.
[7]赵宝友,马震岳,丁秀丽.不同地震动输入方向下的大型地下岩体洞室群地震反应分析[J].岩石力学与工程学报,2010,29(S1):3 395—3 402.Zhao B Y,Ma Z Y,Ding X L.Seismic response of a large underground rock cavern groups considering different incident angles of earthquake waves[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(S1):3 395—3 402.
[8]苑举卫,杜成斌,刘志明.地震动斜入射条件下重力坝动力响应分析[J].振动与冲击,2011,30(7):120—126.Yuan J W,Du C B,Liu Z M.Time-domain seismic response for gravity dam to obliquely incident and Seismic waves[J].Journal of Vibration and Shock,2011,30(7):120—126.
[9]傅方,赵成刚,李卫华,等.SV波斜入射下局部地形对隧道地震响应的影响[J].北京交通大学学报,2012,36(6):79—84.Fu F,Zhao C G,Li W H,et al.Influence of local topographic on seismic response of tunnels subjected to obliquely incident SV waves[J].Journal of Beijing Jiaotong University,2012,36(6):79—84.
[10]潘旦光,楼梦麟,范立础.多点输入下大跨度结构地震反应分析研究现状[J].同济大学学报,2001,29(10):1 213—1 219.Pan D G,Lou M L,Fan L C.Status of seismic response analysis of long-span structures under multiple support excitations[J].Journal of Tongji University,2001,29(1):1 213—1 219.
[11]白凤龙,李宏男.地震多点激励下大跨空间网格结构的反应分析[J].工程力学,2010,27(7):67—73.Bai F L,Li H N.Seismic response analysis of longspan spatial truss structure under multi-support excitations[J].Engineering Mechanics,2010,27(7):67—73.
[12]杜修力,赵密,王进廷.近场波动模拟的人工应力边界条件[J].力学学报,2006,38(1):49—56.Du X L,Zhao M,Wang J T.A stress artificial boundary in FEA for near-field wave[J].Chinese Journal of Theoretical and Applied Mechanics,2006,38(1):49—56.
[13]赵建峰,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].Journal of Mechanics,2007,24(4):52—58。
[14]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.
[15]徐海滨,杜修力,赵密,等.地震波斜入射对高拱坝地震反应的影响[J].水力发电学报,2011,30(6):159—165.Xu H B,Du X L,Zhao M,et al.Effect of oblique incidence of seismic waves on seismic responses of high arch dam[J].Journal of Hydroelectric Engineering,2011,30(6):159—165.
[16]杨大彬,张毅刚,吴金志.纵边落地支承单层柱面网壳强震倒塌机理及参数分析[J].世界地震工程,2011,27(4):143—148.Yang D B,Zhang Y G,Wu J Z.Collapse mechanism and parameter analysis of single-layer cylindrical latticed shell with longitudinal edge supports on ground under severe earthquake[J].World Earthquake Engineering,2011,27(4):143—148.
[17]曹资,薛素铎,王雪生,等.空间结构抗震分析中的地震波选取与阻尼比取值[J].空间结构,2008,14(3):3—8.Cao Z,Xue S D,Wang X S,et al.Selection of earthquake waves and values of damping ratio for space structures in aseismic analysis[J].Spatial Structure,2008,14(3):3—8.
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