Reliability Analysis Of Large-diameter Reinforced Concrete Underground Silo

Large diameter underground reinforced concrete grain silo as a new type of underground storage, that is China’s potential granary construction of a new development direction, its advantage in keeping the original underground storehouse, on the basis of and overcome the deficiency of the existing underground warehouse part. Grain silos and other underground structures, underground in the whole process of design and construction and operation of a lot of uncertainty, which requires a lot of scientific research workers to this kind of new grain storage structure for more in-depth research, avoid the larger degree of structure failure and accident. For large diameter underground reinforced concrete grain silo design parameters of the simulation analysis and safety evaluation, as well as design parameters, the parameters that influence the structural reliability is larger and accurately in the process of design and construction of selection and strict control.The purpose of the paper is to study the reliability of the large diameter underground reinforced concrete grain silos, for large diameter underground provides the reference for the design of reinforced concrete grain silos, for large diameter underground reinforced concrete the security of grain silo construction to provide the reference. Based on the large diameter underground reinforced concrete grain silo as the research object. By the《Henan gemdale grain logistics park in geotechnical engineering investigation report provided》by the engineering geological conditions for reference, under the most unfavorable load condition research of large diameter underground reinforced concrete grain silo, wall of underground grain silo deformation and internal force of grain. In underground grain silo during the construction process of the backfill warehouse wall wall of the lateral pressure and warehouse and warehouse bottom field monitoring of internal force.Established under the action of underground water and soil of large diameter underground reinforced concrete finite element model of grain silo.For large diameter underground reinforced concrete grain silo under the condition of different control, the failure probability and the major random parameters sensitivity analysis and correlation coefficient.Specific research contents and methods are as follows:(1) Reinforced concrete grain silo with large diameter underground as the research object, on the basis of predecessors’ research, according to the theory of cylindrical shell with moment and without a moment of shell theory, for large diameter underground reinforced concrete grain silo under the most unfavorable load condition of the underground tube concrete grain silo, wall of underground grain silo deformation and internal force calculation formula.Through example calculation, this paper deduces the method results and without a moment of shell theory and the results of the previous method and numerical simulation results were analyzed.Finally will force more complex warehouse bottom near the warehouse wall deformation and internal force analysis alone, the warehouse bottom near the warehouse wall deformation and internal force of the situation.(2) In the process of underground reinforced concrete silo construction, through to in the process of backfill, the warehouse wall lateral pressure and warehouse wall and field monitoring under-bin internal force.Will test the warehouse wall ring to force to calculate the warehouse wall lateral pressure, compared with the measured warehouse wall lateral pressure.Then according to the results of monitoring the warehouse wall ring to compare with the results of the formula to calculate pressure.From theory to simulation and field monitoring three aspects, the research of large diameter underground reinforced concrete tube concrete grain silo, wall of underground grain silo lateral pressure, the tendency of the deformation and internal force.(3) According to the structure bearing capacity limit state and serviceability limit state analysis, according to the different control conditions were established by the underground food barrel grain silo,body of underground grain silo strength, cracking warehouse, warehouse top deflection of beam slab structure and the silo wall deformation control of the four functions of structure, the material characteristic parameters and load characteristic parameters as the input parameters, with ANSYS as analysis tool, select Prob probability Design, the Design is more widely used Monte Carlo analysis method, the selection of Latin Hypercube sampling method to perform reliability computing functions, functions of failure probability and reliability index.From underground food barrel concrete grain silo,body of underground grain silo strength, warehouse crack, warehouse roof beam slab structure deflection and warehouse wall structure deformation four aspects analysis of large diameter underground the reliability of the reinforced concrete structure of grain silos.(4) Through the Prob Design probability Design Monte Carlo method, the output random parameters and functions of the sensitivity analysis, sensitivity is greater than 2.5% of the random parameters, and then discusses the correlation coefficient, improve function function reliability index, the main parameters is put forward in the construction process can improve the reliability index of the measures, and should be pay attention to in the construction and the strict control.