| In this paper,the actual project of grain steel silo supported by explosive brick wall is used as the research object,and the repair and transformation scheme is analyzed and optimized for the damaged brick wall support structure under the steel silo.In view of the poor seismic performance and serious damage of the original brick wall support structure,the reinforced concrete cylindrical support structure is used as the repair scheme of the base structure of the steel silo,taking into account the space required for the production process,the cost of controlling the repair and transformation to reduce the economic loss,and the rapid recovery of production and use.Concrete cylindrical support is beneficial to the combination of reinforced concrete conical bottom plate in the original steel silo,making full use of the undamaged part,and has the advantages of flexible space arrangement and improving the seismic performance of the overall structure of the silo.For this reason,three kinds of cylindrical support structures in the form of structural arrangement are designed,and the optimal scheme is optimized by analysis and comparison.Because of the different materials of the upper steel silo and the lower reinforced concrete cylindrical support structure,it is impossible to accurately define the stiffness distribution by using the design and calculation of the common structural design software(such as PKPM,etc.),so that the satisfactory design results can not be obtained,so the SAP2000 finite element software is adopted,By establishing the finite element model of the steel silo of three kinds of cylindrical support schemes,the static analysis and time-history analysis under two working conditions of empty silo and full position are carried out,and the best arranged cylindrical support structure scheme is optimized by comparing the internal force and displacement of the structure.Based on the result of optimal scheme,the time-history analysis of two kinds of cylindrical support structures in the form of structural arrangement is carried out,and the influence of the layout mode of the bottom support structure of the column bearing silo on the seismic performance of the silo is compared,and the specific work contents are as follows:1.Determine the rehabilitation and reinforcement program.Considering the economy and structural rationality,designing the concrete column support structure instead of the damaged brick wall support,considering the cost saving and structural seismic performance,designing the peripheral single row column,the inside and outside double row column and the inside and outside three rows of column three column support silo reinforcement scheme;2.Preliminary structural design of three kinds of column support structure.Under the condition of full reference to the specification provisions and literature,the calculation model of the structure is reasonably simplified,the seismic effect of the three pillar support structures is calculated according to the bottom shear force method,the bottom support structure of the silo is modeled in PKPM,and the components of the silo support structure are initially estimated to be matched with the silosupportstructure;3.In SAP2000,the overall finite element model of the silo is established,and the shaft force,bending moment and displacement of the bottom support column under the action of static load are calculated under the condition of full and empty warehouse operations.Three column-bearing silo comparison,the inside and outside three rows of column-type silo column top and column bottom bending moment are to a certain extent less than the peripheral single column holding silo and inside and outside the double column holding silo column top and column bottom bending moment,inside and outside the three-row column-type silo static load force more reasonable;4.The modal analysis of the three-pillar silo model is carried out under the two operating conditions of empty and full position,the dynamic characterristics of the three pillar-bearing silos are calculated,and the time period analysis is carried out on the basis of the modal analysis data,and the maximum horizontal displacement,column-top displacement angle and base shear force are calculated under the three silos and rare earthquakes.Three kinds of column-bearing silos with the inside and outside three rows of column-type silos and column-top structure deformation is minimal;5.The displacement of two kinds of column-bearing silos in rare earthquakes is calculated by time-range analysis.Under the condition of the rare earthquake full warehouse,the top and column top displacement of the two rows of column holding silos in the inner and outer circles are less than the outer dense column silos.In this paper,the program optimization analysis of the bottom support structure of the brick wall supporting grain steel silo,the research method and conclusion of which can be used for the reinforcement and design of similar engineering. |
PDF Full Text Request