巨子型有控结构体系中附加柱的连接方式
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摘要
附加柱是巨子型有控结构体系(Mega-sub Controlled Structural System,即MSCSS)中的必要组成部分,附加柱的连接方式对MSCSS的动力特性有较大影响。结合概率密度演化理论及切球选点方法,通过对巨子型有控结构体系在结构参数及地震激励均为随机变量情况下进行附加柱应力响应计算,得到附加柱应力响应的概率密度演化曲面,对不同附加柱与巨型梁连接方式下的附加柱应力进行了研究。结果表明:释放附加柱的水平约束,可以有效地降低附加柱应力响应的均值及标准差,整体提高巨子型有控结构体系的抗震能力;而附加柱应力概率密度的不均匀性表明,即使巨子型有控结构体系受到平稳随机地震作用激励,其附加柱应力响应也将表现出明显的非平稳性。
Additional columns are the main components of a mega-sub controlled structural system(MSCSS).Employing the probability density evolution theory and the strategy of selecting points via sphere of contact,the stress responses of an additional column were analyzed under seismic load.The parameters of the structure and the seismic excitation were considered as stochastic variables during computation.The probability density evolution curve surface was obtained and the effects of different connection modes between additional column and mega-beam were also investigated.The results showed that the mean and the standard deviation of additional column stress are reduced effectively by releasing the horizontal restraint between additional column and mega-beam;this connection mode enhances the aseismic ability of the integral MSCSS;the non-homogeneity of the probability density of additional column stress demonstrates that the stress responses of additional column have obvious non-stationary feature,even if the MSCSS is subjected to a stationary stochastic seismic excitation.
Additional columns are the main components of a mega-sub controlled structural system(MSCSS).Employing the probability density evolution theory and the strategy of selecting points via sphere of contact,the stress responses of an additional column were analyzed under seismic load.The parameters of the structure and the seismic excitation were considered as stochastic variables during computation.The probability density evolution curve surface was obtained and the effects of different connection modes between additional column and mega-beam were also investigated.The results showed that the mean and the standard deviation of additional column stress are reduced effectively by releasing the horizontal restraint between additional column and mega-beam;this connection mode enhances the aseismic ability of the integral MSCSS;the non-homogeneity of the probability density of additional column stress demonstrates that the stress responses of additional column have obvious non-stationary feature,even if the MSCSS is subjected to a stationary stochastic seismic excitation.
引文
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[8]李杰.随机结构系统——分析与建模[M].北京:科学出版社,1996:1-4.
[9]崔利杰,吕震宙,王奇.概率密度演化方法在机构运动精度可靠性中的应用研究[J].机械科学与技术,2010,29(5):690-700.
[10]陈建兵,李杰.非线性随机地震响应的概率密度演化分析[J].武汉理工大学学报,2010,32(9):6-10.
[11]陈建兵,李杰.随机结构反应概率密度演化分析的切球选点法[J].振动工程学报,2006,19(1):2-7.
[12]陈建兵,李杰.结构随机响应概率密度演化分析的数论选点法[J].力学学报,2006,38(1):134-139.
[13]中华人民共和国冶金工业部.钢结构设计规范GBJ17-88[M].北京:中国建筑工业出版社,1989.
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