Dynamic Calculation Of Silo On Structure-Foundation Interaction

The silo applies in the agriculture, mining industry, the chemical industry, the electric power and so on, for many domains dispersed material storage. As a special towering structure, the structure calculation and theoretic analysis on silo are different from that of buildings. There are still many different viewpoints which need to be research furtherly, although many researchers have done many researches and experiments and have drawn some consistent conclusions and calculation formulas. As one kind thin shell special structure, the complex stress situation and the traditional simple design method causes the silo accident ofter occurs. Stored material loads acting on silo wall and the interaction between the foundation and the silo now are two cirtical questions for engineering designers. By the earthquake engineering practice, it is realize that structure-foundation dynamic interaction has important influence to the seismic response of silo more and more.This paper was accomplished part of content which theoretical analysis and experimental study for dynamic characteristic of bulk solid-silo-foundation spatial interaction system was item of Shannxi provience's office of Science and Technology, makes the following research work:1. Use finite element method to make systematic analysis on the interaction among base-silo-bulk solid and draw some conclusions. When making finite element calculation on model silo and single silo, consider the exact change of the rigid of each section of the structure. Divide the silo body and the foundation into element of plate and shells, of beam and of brick and then make calculation so that the model can reflect the real condition of the structure and the foundation.2. This paper used Lumped mass-Elastic pole for simulate bulk solid in the silo and designed the different calculating model and contrast with its results. Use finite element method to make static and dynamic calculating analysis on silo model on different foundation. Make research on the reaction of bulk solid to silo wall and to attenuation of silo structure while the dynamic response of silo models to foundation's simple harmonic motion is calculated.3. The New-mark time integration method is used to the nonlinear temporal dynamic analysis of the silo-foundation structure under different seismic load levels on the different foundation. Some dynamic response characters and general regularity of silo structure under seismic load are analyzed by numerical calculation to find out which part of the silo is in danger and to evaluate the aseismatic power of the silo.After this systematic research on the static and dynamic press characters of the silo structure, this paper summarizes the research results and gives some conclusions, and also points out that there are some problems which are worthy of deep study.