考虑转动激励影响的不规则结构地震响应分析
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摘要
地震动是一种典型的非平稳随机过程,其特性与结构的场地土条件、远近震等因素密切相关.文章主要考虑了场地土条件对地震动功率谱的影响,采用小波分析的方法,计算演变随机地震动激励对应的小波系数,并生成了地震动平动激励和转动激励的加速度时程,以之作为等效激励输入,对一个Ⅱ类场地上的不规则结构进行了仿真分析.结果表明,对于不规则结构而言,地震动激励的转动部分和非平稳特性对结构的动力响应有显著的影响.
Earthquake shock is a typical non-stationary random process,its features mainly depend on the insite earth conditions and other affecting factors,such as the distance with the earthquake center. In this paper,the in-site condition affect is incorporated into the power spectral density of seismic acceleration,and the wavelet coefficients of the evolutional random seismic excitations are calculated,both of the translational and torsional seismic acceleration time histories are reconstructed by using wavelet transform method. An irregular structure on site type II is simulated by using these excitations as equivalent inputs. The results show that the torsional input and the evolutionary feature of the excitations have great effects on the dynamic responses of the structure.
Earthquake shock is a typical non-stationary random process,its features mainly depend on the insite earth conditions and other affecting factors,such as the distance with the earthquake center. In this paper,the in-site condition affect is incorporated into the power spectral density of seismic acceleration,and the wavelet coefficients of the evolutional random seismic excitations are calculated,both of the translational and torsional seismic acceleration time histories are reconstructed by using wavelet transform method. An irregular structure on site type II is simulated by using these excitations as equivalent inputs. The results show that the torsional input and the evolutionary feature of the excitations have great effects on the dynamic responses of the structure.
引文
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[3]KIM H,ADELI H.Hybrid control of irregular steel highrise building structures under seismic excitations[C]∥Int J for Num Methods in Engin,2005,12(63):1757-1774.
[4]李宏男.结构多维抗震理论[M].北京:科学出版社,2006.LI H N.Structural multi-dimensional aseismic theory[M].Beijing:Science Press,2006.
[5]林家浩,张亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004.LIN J H,ZHANG Y H.Pseudo excitation method for random vibration[M].Beijing:Science Press,2004.
[6]孙作玉,王晖.结构振动分析的等效激励法[J].工程力学,2010(增刊I):20-22.SUN Z Y,WANG H.Equivalent excitation method for structural vibration analysis[J].Engin Mech,2010(Suppl):20-22.
[7]SUN Z Y,WANG H,FANG M S,et al.Random vibration of a cable-stayed bridge under multi-dimensional seismic excitations[C].Materials Proc and ManufacturingⅢ,2013:1119-1123.
[8]杜修力,陈厚群.地震动随机模型及其参数确定方法[J].地震工程与工程振动,1994,14(4):1-5.DU X L,CHEN H Q.Random ground motion model and its parameters determination method[J].Earthq Engin Engin Vib,1994,14(4):1-5.
[9]建筑抗震设计规范GB50011-2010[S].北京:中国建筑工业出版社,2010.Building aseismic design code GB50011-2010[S].Beijing:China Arch&Building Press,2010.
[10]LI H N,SUN L Y,WAN S Y.Improved approach for obtaining rotational components of seismic motion[J].Nucl Engin Design,2004,232(2):131-137.
[11]孙强.地震动的转动分量及结构的随机反应分析[D].沈阳:沈阳建筑大学,2005.SUN Q.Earthquake rotational component and structural random response analysis[D].Shenyang:Shenyang Architectural University,2005.