Simulation of Lateral Pressure of Reinforced Concrete Silo During Unloading

Lateral pressure is an important problem in the calculation of silo structure.The static and dynamic flow problems of reinforced concrete silo were simulated by finite element method.Firstly,the constitutive relation of silo material was investigated,the contact action between bulk material and silo wall was analyzed,and the adaptive mesh was used to solve the problem of large displacement deformation and grid distortion.The model adopted the three-dimensional entity element construction,and bulk material used the Drucker-Prager criterion constitutive relation,which broke through the defects of the previous axisymmetric rigid body model.Considering the influence of the funnel on the lateral pressure,the cylinder wall and the funnel were simulated,the static simulation and the horizontal side pressure and the maximum stress of unloading process of the dynamic unloading were obtained,and the simulation results were compared with the Chinese standard and European standard,the results showed that the static simulation was in good agreement with the Chinese standard,and the European standard had a higher safety factor,unloading side pressure was 1.55-1.89 times of static lateral pressure.