Seismic Behavior Analysis Of Reinforced Concrete Silo Wall Reinforced With CFRP Sheets

Silo structure is widely used in various fields due to its advantages of large capacity,small footprint,fast discharge and high degree of mechanization.Since the tangshan earthquake,more and more researches have been made on the seismic response of silo structure,but few have been made on the seismic response of fiber reinforced silo structure.Based on the reinforced concrete alumina silo reinforcement project of shandong binzhou beihai limited company,this paper studies the seismic performance of the silo structure reinforced with carbon fiber cloth.The main work is as follows:First of all,a comprehensive inspection and appraisal of alumina silo project was carried out to clarify the actual reinforcement configuration,concrete strength grade,component size and other engineering indicators of the silo wall structure.PKPM software was used to check and calculate the mechanical performance of alumina silo.According to the checking results,the reinforcement design scheme of alumina silo wall was made.Secondly,SAP2000 finite element software was used to establish the data model of carbon fiber reinforced alumina silo.For the convenience of comparison,the data model includes four models: unreinforced silo,three-layer carbon fiber reinforced silo,four-layer carbon fiber reinforced silo and five-layer carbon fiber reinforced silo.According to the three elements of earthquake activity chooses suitable alumina silos of three earthquake records(El Centro earthquake wave,Taft seismic waves and tianjin NingHe seismic wave),each of the strong earthquake records was adjusted to five levels of earthquake intensity,the linear static analysis of silo model of alumina,the acceleration time history analysis and displacement time history analysis,to explore the seismic performance of carbon fiber reinforced aluminum oxide silo,analysis the main conclusions are as follows:(1)The radial displacement of alumina silo strengthened by different carbon fiber sheets was studied by linear static analysis.The data show that the radial displacement of alumina silo decreases with the increase of carbon fiber layers.The results show that CFRP provides effective circumferential restraint for the silo,inhibits the expansion of the silo radial displacement,and has good reinforcement effect on the alumina silo.(2)With the increase of carbon fiber layers,the radial displacement of the silo decreasesgradually.However,as the number of carbon fiber layers increases,the effective binding force provided by each layer of carbon fiber cloth for alumina silo gradually decreases.(3)The acceleration time history analysis of the alumina silo shows that the maximum acceleration of the silo increases with the increase of the number of layers reinforced with carbon fiber.Under different seismic loads,with the increase of the number of layers of carbon fiber,the acceleration amplification coefficient increases gradually.Under frequent seismic loads,carbon fiber does not respond to the dynamic characteristics of the silo.(4)The time history of displacement of alumina silo is analyzed to analyze the maximum relative displacement change of carbon fiber reinforced silo with different layers under frequent earthquakes.With the increase of carbon fiber layers in the silo,the relative displacement of the silo decreases gradually.Carbon fiber cloth has a good inhibiting effect on displacement deformation of cylinder.Carbon fiber has great response to the displacement and deformation of silo.