Research on Seismic Wave Delay and Amplification Methods in the Shaking Table Test of Large-Span Structures in Mountain Areas

Abstract

The traveling wave and slope amplification effects should be considered in the shaking table test of large-span structures in mountain areas. Based on the structural characteristics and site conditions of a large-span structure in a mountain area, this paper designed a high-rise steel frame structure with viscous dampers through finite element analysis to amplify seismic waves with a time delay. Then, the original structure and steel frame models with a similarity ratio of 1/40 were made for shaking table tests. The test results showed that a high-rise steel frame structure with reasonable viscous dampers could delay and amplify seismic waves, and the scaled model of the structure could play the same role in shaking table tests. Meanwhile, by comparing the seismic responses of large-span structural models in mountain areas before and after the amplification of seismic wave delays, it was found that the delay and amplification of seismic waves had little impact on the acceleration response of the structure. In contrast, the seismic wave delay played a dominant role in the change in the structural displacement response.

Shaking table test on seismic performance of a large-span high-rise building

“…In addition, increasing the number of dampers could decrease the amplification effect of seismic waves. For the convenience of subsequent shaking table tests, the use of a steel frame with viscous dampers was proposed to amplify and delay seismic waves based on various factors 36 . The size of the steel frame structural components and the number of viscous dampers were continuously adjusted to balance the time delay and amplification effects, achieving the expected design goals of steel frame structures.…”