SH波激励下上覆粘弹性场地土的振动分析
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摘要
采用工程波动理论,考虑简谐SH波诱发的水平振动和场地土的材料阻尼,假定场地土体系处于反平面应变状态,研究半空间上SH波激励下上覆粘弹性场地土的自由场动力反应。利用正交函数法求解基岩运动输入下上覆土层的振动解,以此解来分析SH波激励下粘弹性场地土的放大效应,并将探讨其影响因素。本文结果为进一步研究土—结构物动力相互作用打下坚实的基础,对建筑抗震设计和震害分析具有理论和工程实际意义。
By using the wave theories,considering horizontal vibration induced by harmonic SH wave and material damping of soil,besed on the assumption that the ground soil mass is under anti-plane strain states,the free field dynamic response of overlying viscoelastic soil layer under SH wave excitation is mostly presented in this paper.By utilizing method of orthogonal functions,the vibration solution of overlying soil layer under bedrock motion import can be solved.We can analyse the amplification effect of the viscoelastic ground site under SH wave excitation,and discuss the influencing factors.This results establishes consistent foundation for the further studies of soil-structure dynamic interaction.it has theoretical and practical application significance in proceeding the construction seismic designs and earthquake damage analyses.
By using the wave theories,considering horizontal vibration induced by harmonic SH wave and material damping of soil,besed on the assumption that the ground soil mass is under anti-plane strain states,the free field dynamic response of overlying viscoelastic soil layer under SH wave excitation is mostly presented in this paper.By utilizing method of orthogonal functions,the vibration solution of overlying soil layer under bedrock motion import can be solved.We can analyse the amplification effect of the viscoelastic ground site under SH wave excitation,and discuss the influencing factors.This results establishes consistent foundation for the further studies of soil-structure dynamic interaction.it has theoretical and practical application significance in proceeding the construction seismic designs and earthquake damage analyses.
引文
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[2]房营光.岩土介质与结构动力相互作用理论及其应用[M].北京:科学出版社,2005.
[3]郑永来,杨林德,周健,等.地下结构抗震[M].上海:同济大学出版社,2005.
[4]王杰贤.动力地基与基础[M].北京:科学出版社,2001.
[5]王松涛,曹资.现代抗震设计方法[M].北京:中国建筑工业出版社,1997.
[6]李刚,任慧,尚守平.上覆非线性场地土的振动分析[J].湖南大学学报(自然科学版),2003(12):86~89.
[7]李刚,尚守平,王贻荪.结构与地基动力相互作用的解析分析[J].湖南大学学报(自然科学版),1999(12):78~84.
[8]鲍亦兴,毛昭宙.弹性波的衍射与动应力集中[M].北京:科学出版社,1993.
[9]廖振鹏.工程波动理论导引[M].北京:科学出版社,2002.
[10]K.K.Koo,K.T.Chau.X.Yang.Soil-pile-structure inter-action under SH wave exaction[J].Earthquake Engi-neering and Structure Dynamics,2003,32:395~415.
[11]DAVIS R.Effects of weathering on site response[J].Earthquake Engineering and Structure Dynamics,1995,24(2):301~309.
[12]IDRISS I M,SEED H B.Seismic response of horizontalsoil layers[J].Journal of the Soil Mechanics and Founda-tions Division,1968,94(4):1003~1031.
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