Shear-type Substructure Shaking Table Testing Method with High Stability

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.