圆形地下连续墙场地动力反应分析的子结构方法
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摘要
利用子结构方法对某超大直径圆形地下连续墙场地进行了动力反应分析.介绍了子结构分析方法的基本原理,探讨了主自由度节点的一般选取原则.采用等效线性化方法考虑土体非线性性质,并运用ANSYS参数化设计语言编制了场地土层模型的子结构方法计算分析程序.建立圆形地下连续墙场地计算模型,分别采用3种主自由度节点选取方法对其进行了动力计算分析.通过对比子结构方法和整体方法计算结果,验证了子结构分析计算方法的合理性及有效性.数值分析结果表明,若合理地选择主自由度节点,采用子结构方法可以在保证计算精度的基础上极大地提高计算效率.
Using a substructure method,the dynamic response of a project site is analyzed,in which a circular diaphragm wall with a super-large diameter is built.First,the basic principle of substructure method is introduced briefly,and how to select master degree of freedom(DOF) is also discussed.Then,an equivalent linearity method is applied to consider the soil nonlinearity,and a program based on substructure method is compiled by parametric design language in ANSYS for the dynamic response analysis of the soil site.Finally,the finite element model of the soil site with the circular diaphragm wall is established,and the dynamic response of the soil site is computed by using the whole analysis method and the substructure method,in which three selection ways of master DOF are adapted.Through comparing the results obtained from the two methods,the rationality and effectiveness of the substructure method are verified.The numerical results show that selecting master DOF rationally in substructure analysis can greatly improve the calculation efficiency while ensuring the precision.
Using a substructure method,the dynamic response of a project site is analyzed,in which a circular diaphragm wall with a super-large diameter is built.First,the basic principle of substructure method is introduced briefly,and how to select master degree of freedom(DOF) is also discussed.Then,an equivalent linearity method is applied to consider the soil nonlinearity,and a program based on substructure method is compiled by parametric design language in ANSYS for the dynamic response analysis of the soil site.Finally,the finite element model of the soil site with the circular diaphragm wall is established,and the dynamic response of the soil site is computed by using the whole analysis method and the substructure method,in which three selection ways of master DOF are adapted.Through comparing the results obtained from the two methods,the rationality and effectiveness of the substructure method are verified.The numerical results show that selecting master DOF rationally in substructure analysis can greatly improve the calculation efficiency while ensuring the precision.
引文
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[2]周健,罗筱波.圆形支护结构的拱效应等效支撑计算方法[J].岩土力学,2003,24(2):169-172.Zhou Jian,Luo Xiaobo.Structural computation of circular retaining structure using method of equivalent retaining of archeffect[J].Rock and Soil Mechanics,2003,24(2):169-172.(in Chinese)
[3]张具寿,黄沛,钱水江,等.超大直径圆形无支撑深基坑施工技术[J].岩土工程学报,2006,28(增刊):1737-1741.Zhang Jushou,Huang Pei,Qian Shuijiang,et al.Construction techniques of deep foundation pits with circular self-sustaining and super large diameter[J].Chinese Journal of Geotechnical Engineering,2006,28(sup):1737-1741.(inChinese)
[4]楼梦麟,严国香,沈建文,等.上海软土动力参数变异性对土层地震反应的影响[J].岩土力学,2004,25(9):1368-1372.Lou Menglin,Yan Guoxiang,Shen Jianwen,et al.Effect of variability of dynamic parameters of soft soil in Shanghairegion on seismic response of layered soil[J].Rock and Soil Mechanics,2004,25(9):1368-1372.(in Chinese)
[5]楼梦麟,潘旦光,范立础.土层地震反应分析中侧向人工边界的影响[J].同济大学学报:自然科学版,2003,31(7):757-761.Lou Menglin,Pan Danguang,Fan Lichu.Effect of vertical artificial boundary on seismic response of soil layer[J].Journal of Tongji University:Natural Science,2003,31(7):757-761.(in Chinese)
[6]马少坤,于淼,崔浩东.子结构分析的基本原理和ANSYS软件的子结构分析方法[J].广西大学学报:自然科学版,2004,29(2):150-153.Ma Shaokun,Yu Miao,Cui Haodong.The basic principle of substructure analysis and the technique of substructure analysiswith the software of ANSYS[J].Journal of Guangxi University:Natural Science Edition,2004,29(2):150-153.(inChinese)
[7]杨庆山,刘文华,田玉基.国家体育场在多点激励作用下的地震反应分析[J].土木工程学报,2008,41(2):35-41.Yang Qingshan,Liu Wenhua,Tian Yuji.Response analysis of national stadium under especially variable earthquake groundmotions[J].China Civil Engineering Journal,2008,41(2):35-41.(in Chinese)
[8]齐文浩,薄景山.土层地震反应等效线性化方法综述[J].世界地震工程,2007,23(4):221-226.Qi Wenhao,Bo Jingshan.Summarization on equivalent linear method of seismic responses for soil layers[J].WorldEarthquake Engineering,2007,23(4):221-226.(in Chinese)
[9]Guyan R J.Reduction of stiffness and mass matrices[J].AIAA Journal,1965,3(2):380.
[10]李永华.多点激励下多塔连体结构抗震与减震性能研究[D].上海:同济大学土木工程学院,2009.
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