具有高稳定性的剪切型子结构振动台试验

Shear-type Substructure Shaking Table Testing Method with High Stability

摘要:

提出了使用改进ChenRicles（CR）积分算法的多层剪切型子结构振动台试验方法.该改进积分算法保留了CR算法的速度和位移表达式，但在计算积分参数时引入了稳定性调节系数.此外，为了考虑试验子结构的贡献，使用了动力凝聚技术.最后，使用离散控制理论对所提的子结构方法进行了稳定性分析，变量包括结构参数、时间步长、稳定性调节系数、是否采用动力凝聚以及动力凝聚的兴趣频率.根据2层剪切型结构的稳定性分析结果，与使用CR积分算法的子结构振动台试验方法相比，所提的改进方法可以非常有效地提高稳定性.

关键词:振动台试验; 子结构; 稳定性; 离散控制理论; 动力凝聚

Abstract:

A substructure shaking table testing (SSTT) method using a modified ChenRicles (CR) integration algorithm for the multistory sheartype structure was proposed. The velocity and displacement formulations of the CR algorithm were retained in the modified algorithm, while a stability adjustment factor was introduced to calculate the integration parameters. In addition, dynamic condensation technique was used to take the contribution of the experimental substructure into consideration. Finally, stability analyses of the proposed substructure method were conducted using the discrete control theory. The variables include the structural parameters, time step, stability adjustment factor, whether or not using dynamic condensation, and interest frequency of dynamic condensation. It can be drawn from the stability analysis results of a 2story sheartype structure that the proposed method is able to efficiently improve the stability compared to the SSTT method using the CR algorithm.

Key words:shaking table testing; substructure; stability; discrete control theory; dynamic condensation