Dynamic responses of three-dimensional isolated storage tank under multi-directional earthquake considering soil-structure interaction

Wei Jing , Mengqi Yan , Shuang Tian , Wenwei Yang

Abstract

The actual earthquake is multi-directional, and the interaction between soil and structure (SSI) will further increase the complexity of structures seismic response under multi-directional earthquake, in order to improve the seismic safety of liquid storage tank (LST), examining the 3-dimensional isolated LSTs dynamic reactions to soil-structure interaction is essential. In this paper, a hybrid 3D isolation system combining horizontal rubber bearings with vertical damping springs is investigated. A numerical model using finite element method with acoustic fluid elements and nonlinear isolator properties is constructed. Key response quantities, including sloshing wave height, liquid pressure, and tank shell stresses, are co MPared under near-field and far-field multi-directional seismic excitations. The results show that the maximum response position changes under multi-directional earthquakes. The dynamic responses of the non-isolated LST change dramatically as the number of seismic input directions increases, whereas the 3-dimensional isolated LSTs dynamic responses barely alter. The 3-dimensional isolation has an amplification effect on the height of the liquid sloshing waves, which in some cases exceeds the designated wall height, raising concerns regarding overtopping risk and the structural adequacy of the top ring. Nevertheless, it exhibits a steady damping effect on the bulk of seismic responses. 3-dimensional seismic isolation can provide an effective way for the earthquake prevention and disaster reduction of LSTs under multi-directional earthquakes.

Key Words

3-D isolation; dynamic response; liquid storage tank; multi-directional earthquake; soil-structure interaction

Address

Wei Jing — 1) Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou, 730050, PR China; 2) Ningxia Center for Research on Earthquake Protection and Disaster Mitigation in Civil Engineering, Yinchuan 750021, PR China
Mengqi Yan, Shuang Tian — Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou, 730050, PR China
Wenwei Yang — 1) School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, PR China; 2) Ningxia Center for Research on Earthquake Protection and Disaster Mitigation in Civil Engineering, Yinchuan 750021, PR China

PDF Viewer

Preview is limited to the first 3 pages. Sign in to access the full PDF.

← Back to Volume 30, No. 3