Seismic response of shaft tower considering soil-structure interaction in different sites

Abstract:

In view of the relationship between the soil-structure interaction (shaft tower and well bore) and the seismic analysis of shaft tower in Ⅱ and Ⅲ sites, the influence on the seismic response of shaft tower with or without considering the soil-structure interaction in Ⅱ and Ⅲ sites was systematically studied by means of theoretical analysis and numerical analysis. The theoretical equation of motion in time domain was proposed and established, and the solution was presented with Runge-Kutta method and programmed using MATLAB language. Combined with finite element software, the numerical analysis model of the system was established. Taking the shaft tower of a reinforced concrete shear wall structure as an example, the influence on the seismic response of the shaft tower was obtained considering the system interaction under the conditions of Ⅱ and Ⅲ sites. Results show that the theoretical analysis model was in good agreement with the numerical analysis model, and the maximum difference between the theoretical solution and the numerical solution was 9.8%, which verifies the accuracy of the two models. The average amplification factors of the seismic response of three seismic waves under the conditions of Ⅱ and Ⅲ sites were 1.8 and 2.4 times respectively. In engineering design, the influence of soil-structure interaction on the seismic analysis of shaft towers should be considered under the conditions of Ⅱ and Ⅲ sites; the softer the soil is, the greater the influence of soil-structure interaction on the seismic analysis of the shaft tower is.