半空间上水平层状场地自振频率计算方法比较
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摘要
为避免结构物与场地地基的共振效应,基于传统波速法、一致质量矩阵剪切质点系法及剪切梁法的基本原理,分析和比较了各方法计算场地自振频率的计算精度和影响因素.结果表明:传统波速法不能反映土层剖面结构特征的影响,而且仅在土层剖面在深度方向较为对称的情况下才能获得工程可接受的精度;一致质量矩阵剪切质点系法则表现出计算稳定、精度高的特点,且作为一种离散方法,具有良好的计算适应性和灵活性.
In order to avoid the resonance between structure and ground,the natural frequency of engineering establishments should be different from that of ground.On the basis of fundamental principles of traditional wave velocity method,shear particle method with consistent mass and shear beam method,the computational accuracy and influence factor for above different methods are analyzed and compared.Computing results show that the traditional wave velocity method can't response the influence of the soil profile structure and has relatively satisfactory accuracy only in relatively symmetrical profile condition.Comparatively,shear particle method with consistent mass shows characteristics of computational stability and high accuracy and as a discrete method,has good computing adaptability and flexibility.
In order to avoid the resonance between structure and ground,the natural frequency of engineering establishments should be different from that of ground.On the basis of fundamental principles of traditional wave velocity method,shear particle method with consistent mass and shear beam method,the computational accuracy and influence factor for above different methods are analyzed and compared.Computing results show that the traditional wave velocity method can't response the influence of the soil profile structure and has relatively satisfactory accuracy only in relatively symmetrical profile condition.Comparatively,shear particle method with consistent mass shows characteristics of computational stability and high accuracy and as a discrete method,has good computing adaptability and flexibility.
引文
[1]王钟琦,谢君斐,石兆吉.地震工程地质导论[M].北京:地震出版社,1983:215-216.
[2]熊建国,许贻燕.分层土自振特性分析[J].地震工程与工程振动,1986,6(4):23-37.
[3]陈龙珠,吴世明,魏玉伦.用机械阻抗法求成层地基的固有频率[J].岩土工程学报,1989,11(2):82-87.
[4]Idriss I M,Seed H B.Seismic response of horizontal soil layers[J].Journal of the Soil Mechanics and Foundation Division,1968,94(4):1003-1031.
[5]刘增武.场地土层的周期特性[C]//中科院工程力学研究所地震工程研究报告集(4).北京:科学出版社,1981.
[6]吴世明.土动力学[M].北京:中国建筑工业出版社,2000:210-211.
[7]邓亚虹,夏唐代,彭建兵,等.半空间上水平层状场地自振频率特性研究[J].建筑科学与工程学报,2009,26(1):30-36.
[8]邓亚虹,夏唐代,彭建兵,等.水平层状场地自振频率的剪切质点系法研究[J].岩土力学,2009,30(8):2489-2494.
[9]胡聿贤.地震工程学[M].北京:地震出版社,1988:262-264.
[10]邓亚虹,彭建兵,徐平,等.层状场地自振频率的弹簧—剪切梁法研究[J].工程力学,2014,31(3):144-151.
[2]熊建国,许贻燕.分层土自振特性分析[J].地震工程与工程振动,1986,6(4):23-37.
[3]陈龙珠,吴世明,魏玉伦.用机械阻抗法求成层地基的固有频率[J].岩土工程学报,1989,11(2):82-87.
[4]Idriss I M,Seed H B.Seismic response of horizontal soil layers[J].Journal of the Soil Mechanics and Foundation Division,1968,94(4):1003-1031.
[5]刘增武.场地土层的周期特性[C]//中科院工程力学研究所地震工程研究报告集(4).北京:科学出版社,1981.
[6]吴世明.土动力学[M].北京:中国建筑工业出版社,2000:210-211.
[7]邓亚虹,夏唐代,彭建兵,等.半空间上水平层状场地自振频率特性研究[J].建筑科学与工程学报,2009,26(1):30-36.
[8]邓亚虹,夏唐代,彭建兵,等.水平层状场地自振频率的剪切质点系法研究[J].岩土力学,2009,30(8):2489-2494.
[9]胡聿贤.地震工程学[M].北京:地震出版社,1988:262-264.
[10]邓亚虹,彭建兵,徐平,等.层状场地自振频率的弹簧—剪切梁法研究[J].工程力学,2014,31(3):144-151.
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