Dynamic Characteristics Analysis And Vibration Research Of Large RC Coal-stored Silo

As a functional building with storage and discharge function,coal-stored silo plays a vital role in the production and transportation systems.Most of the coal-stored silos is reinforced concrete structures,which can be divided into the warehouse buildings,silos,supporting structures and foundations.Result of production process,the lower part of cylinders has big openings,as well as the mutation of structural form,which will weaken the anti-vibration of RC coal-stored silo.And there is adverse problem of vibration,especially on the warehouse buildings,with large-storage and large-capacity storage silos.Not only does vibration have an adverse effect on buildings and equipment,but also vibration have some influence on people.So the vibration problems of RC coal-stored silo have become urgent problems in industrial production.There are only a small amounts of studies on structural vibration of coal-stored silos,which most concentrate on the static and dynamic study of coal-stored silo,and no systematically research results that can be used to guide damping of existing buildings with abnormal vibration and anti-vibration design of new structures.Based on the study of coal-stored silo,we aimed to solving vibration problems of practical engineering in this paper.Taking the example of coal-stored silo in Shenmu Ningtiaota Mining Co.Ltd.,we tested and evaluated dynamic response of it;then we built a finite element model and analyzed with SAP2000,and compared the result with the actual one;we tried to make the results closer and has a further research on vibration of the coal-stored silo based on the results.Finally,a reasonable reinforcement scheme,and feasibility analysis.The main contents of this paper:(1)We first retrieved and analyzed the allowing standards and requirements on displacement,velocity,acceleration of buildings from China,Japan to the United States.Based on the test of dynamic response,we evaluated the impact of vibration on equipment and bodies.(2)Then we understand fully the vibration status of coal-stored silo,and got initial cause of vibration by spectrum analysis.By analyzing dynamic characteristics and contributions of vibration sources,we finally determined all vibration sources,including the main vibration source and minor vibration sources.We finally determined the main vibration source and minor vibration sources.(3)Based on reasonable simplification,we established both realistic and easy finite element model of the coal-stored silo.By analyzing the structural modal of coal-stored silo,we obtained the cycle,frequency and quality factor involved in parameters of each vibration mode.Through the measurement and finite element analysis,we verified the rationality of the model.(4)According to field surveys,tests and documentation inspection,we putted forth a set of theories about vibration of coal-stored soli.With the theories,we found the reasons that caused the serious vibration in the horizontal direction,and summarize the calculating method of them.(5)We built the finite element method of the coal-stored silo with SAP2000,and entered the vibration loads,then we analyzed the modal and vibration response of the coal-stored silo.According to comparing the result of dynamical response,which are acquired by time-history analysis,with the actual test results,we got clear regular pattern about the main source and vibration analysis of the structure.(6)Through the finite element simulation analysis,we evaluated the feasibility and effectiveness of two methods of damping,seeking to finding the best one of damping,which can provide a reference for the design and damping of existing coal-stored soli with abnormal vibration.Through altering dynamic characteristic parameters of the material(dynamic elastic modulus and damping ratio),we discussed its impact on the dynamic characteristics of coal-stored silo.