Research On The Design Method Of Floating Corridor-type Shallow Round Warehouse Wall And Corridor

As a new type of silo structure,the squat silo of the upper floating corridor has been used in modern engineering.In order to meet the needs of production,unloading ports with different eccentricities are usually placed at the top of the corridor to discharge,and eccentric discharge causes damage to the structure due to uneven force.At present,there are few studies on the eccentric unloading of the squat silos with upper floating corridor.The Chinese norm only have corrections for the silos of the full warehouse state,lacking theoretical provenance and experimental verification.In this paper,through the full-scale silo test in Laos,finite element simulation and theoretical analysis,the stress law of the structure under eccentric unloading of the floating corridor squat silo is studied.(1)In order to understand the influence of eccentric discharge on the structure of the full-scale silo,the pressure distribution of the structure was obtained through the test data of the Lao silo trial operation.The test results show that under the full load condition,the presence of the corridor and the backfill between the corridors affect the lateral pressure distribution at the bottom of the silo wall.The theoretical value of the top of the full-size silo corridor(calculated height from the top surface of the cone)is about 95% of the test value,and the theoretical value of the side of the corridor is about 85% of the test value.Under the eccentric discharge condition,the overpressure of the silo wall is not obvious,the overpressure at the top of the main and secondary corridors is obvious,and the overpressure coefficient of the top and side walls is not more than 1.2.(2)Based on the full scale silo and experimental data,a three-dimensional finite element model is established.The results show that: During the eccentric discharge process,the pressure,bending moment and circumferential axial force of the wall of silo and corridor near the discharge port are all attenuated faster,the maximum vertical bending moment of the wall increases by 20% compared with the full state,the maximum circumferential bending moment is increased by 14% over the full position.The circumferential axial force and vertical bending moment of the corridor are also increased by 20% compared with the full state,and the increase of the circumferential bending moment is not obvious.Eccentricity and storage parameters have different effects on the wall and corridor.(3)In the design of the upper floating corridor silo wall: The lateral pressure coefficient of the stock and backfill under full warehouse is calculated by k(k=tan~2(45°-φ/2)).The predicted value of the silo formula(calculated height to the center of gravity of the cone)in the silo specification is close to the full scale and scale test values.The pressure on the wall side of the single-hole eccentric discharge is considered to be multiplied by the horizontal pressure coefficient under full-load conditions.In the design of the upper floating corridor :The different theories compare the pressure of the corridor in full state.Whether the corridor is deep or shallow,the top pressure is calculated by the theoretical formula(calculated height is taken to the top surface of the cone)and is closer to the experimental value.The theoretical value of the side wall of the corridor is slightly larger than test value.Under the single-hole eccentric discharge condition,the top and side walls of the corridor are multiplied by the vertical pressure coefficient and the horizontal pressure coefficient under full-load conditions.