巨子型有控结构体系中附加柱的连接方式

Connection modes between additional column and mega-beam in a MSCSS

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.