Simplified analysis method of grid structure considering soil-structure dynamic interaction

Based on the foundation dynamic impedance calculation formulas suggested by different scholars, the S-R (swing-rocking) model was modified by combining with the integral finite element method and starting from the view point of engineering application. The practical simplified calculation method suitable for the soil-structure dynamic interaction analysis of long-span spatial structures was proposed. Then, the model of soil-grid structure interaction was established according to the modified S-R model, and the three-dimensional finite element model verified was also established for a comparative analysis. The study showed that the natural vibration properties and seismic response of the soil-grid structure interaction model based on the modified S-R model reveal same regularities and agree well with those of the 3-D FE model, the rationality of the modified S-R model is verified; the nodal maximum displacement error and peak acceleration error of the soil-grid structure interaction system established with the foundation dynamic impedance calculation formulas proposed by Gazetas are less than 8.0%, and the maximum stress error of members is less than 10% compared with those obtained with the 3-D FE model under different seismic waves; thus the foundation dynamic impedance calculation formulas proposed by Gazetas are more suitable for the analysis of soil-large span spatial structure interaction and have a higher precision. ©, 2015, Chinese Vibration Engineering Society. All right reserved.