The Experimental And Finite Element Analysis On Structure Working Stress Of Large Silos With Cement Clinker

In recent years, with the growing demand for large-capacity storage and the great development in design technique and construction technique, the concrete silo has been greatly enlarged in its diameter and depth. However, up until now, the stressed state of silo thermal stress, as well as temperature load-storage material load static force coupling analysis has not been adequately explored into, the ring enforcement in the bottom of the storage is usually over-calculated when designing, which result in construction difficulties. Based on an practical project of large-diameter concrete silo, having dugging into huge amounts of documents, the author principally carried out some research as follows.1.Study the field silo testing technology to establish the specific pilot program and select the entity silo to do a test. process and analysis the data with the real measurement, and obtain the stress distribution of the silo wall's test.2.According to the structural arrangement of the actual project's form and the engineering requirements, select three kinds of working conditions to take the finite element analysis by using the finite element analysis software ABAQUS, and get the silo wall's stress distribution.3.Compare the mechanical property results of finite element with experimental findings under the working stage, summarize the stress distribution on the silo structure, and then propose the goals and methods of silo structure optimization.The results shows: According to the experimental result, the bottom of the silo wall hoop stress is very close to zero, which is quite similar to finite element results under the condition of horizontal lateral force, but the standardized shallow silo formula shows that the maximum stress lies at the bottom.The edge effect has a great impact on the bottom of the silo wall. Both the experimental and finite element calculation results shows a trend of hoop stress reducing at the bottom of the silo wall, at a certain height, the compressive stress even appears. Temperature effect also acts significantly in FEM, the maximum of the silo wall hoop stress is 4.66MPa under the effect of temperature.Based on theoretical analysis, test of real silo and numerical simulation, the reaearch carried out is about the stress of large-diameter shallow silo wall, which provides references for the design of silo and the theoretical study.About 11.9% silo reinforcement can be saved after optimization, meanwhile it can solve the construction difficulties resulted from excessive reinforcement at the wall bottom.The hoop stress curve of the inside and outside wall coincide nearly under the condition of horizontal lateral force, but it comes to a big difference if the effect of temperature is coupled , the stress of the outside is much greater than the inside when the height is over 1.5m. From the above analysis we can draw the conclusion that the optimization of the structure could be undertaken by lowering the hoop reinforcement at the bottom of the silo wall, especially 4m below and changing the reinforcement layout of the inside and outside wall.