Research on seismic response of a large liquid storage tank using equivalent load method
Jingyuan Li1, Hua Wang1, Xiaochuan You2, Min Ding1, Jinsan Ju1
COMPUTER MODELLING & NEW TECHNOLOGIES 2014 18(12D) 127-132
1Dept. of Civil Engineering, China Agricultural University, Beijing, China
2Dept. of Engineering Mechnics, Tsinghua University, Beijing, China
Based on the principle of added mass method, a method of calculating the dynamic response of the large liquid storage tank under seismic loads is proposed in this paper i.e. equivalent load method. The main idea of this method is converting the added mass to dynamic surface pressure. Compared with added mass method, equivalent load method not only simplifies calculation process but also improves computational efficiency. In order to verify the feasibility of the proposed method, a large liquid storage tank(36m in diameter and 19m in height) was simulated in ABAQUS with added mass method and equivalent load method respectively. The user subroutine UEL was introduced to build added mass element and the different distributions of dynamic pressure was derived in equivalent load method. The results of added mass method and equivalent load method show that they are numerically close. It illustrates the difference and relationship between equivalent load method and added mass method in calculating the dynamic response of the large liquid storage tank under seismic loads, at the same time demonstrates the feasibility of equivalent load method.