随机振动下大跨度钢管混凝土柱结构抗震性能测试方法

摘要

由地震等自然灾害引发的等级多变强随机振动会对大跨度钢管混凝土柱结构产生较大的破坏,造成相关建筑全结构寿命周期性衰减.提出一种随机振动下大跨度钢管混凝土柱结构的抗震性测试方法,在等级多变强随机振动的情况下,设计测试模型,利用信号的协方差矩阵将振动信号与噪声进行分离,通过计算振动信号的强度、后验密度及权值系数等对振动信号进行预处理,获取单一寿命衰减参数;在此基础上引入粒子群算法,求解大跨度钢管混凝土柱结构寿命衰减抑制周期,判断其抗震性.实验结果表明,按照大跨度钢管混凝土柱结构寿命衰减抑制周期的判断方法,可实现对相关建筑结构在等级多变强随机振动下的抗震性测试.%The variable and strong random vibration caused by natural disasters such as earth-quakes can cause great damage to the large-span concrete-filled steel tube column structures, resulting in life periodic attenuation of the whole structure of related buildings.This paper propo-ses a seismic performance testing method for large-span concrete-filled steel tube columns under random vibrations.Under the environment of variable and strong random vibrations,a test model was established;then,the vibration signal was separated from the noise by using the signal covariance matrix.The vibration signal was then processed by calculating the intensity,posterior density,and weight coefficient,and then the single life attenuation parameter was obtained. Afterwards,the particle swarm optimization(PSO)algorithm was introduced to solve the life at-tenuation suppression cycle of long-span concrete-filled steel tubular columns to j udge their seis-mic resistance.The experimental results show that the j udgement method for life attenuation suppression cycle of long-span concrete-filled steel tubular column structures can be used in the seismic test of relevant building structures under variable and strong random vibrations.