Axial Compression Performance Of Steel-concrete-steel Sandwich Composite Wall In Nuclear Engineering

Nowadays, the amount of nuclear power generation of our country ismuch lower than the international average level, so developing the nuclearpower in China is imperative. In the major specific system of CAP1400nuclear power unit, steel plate reinforced concrete structures are widely usedin the internal structure module of reactor powerhouse and other nuclearsafety related structure module. Recently, in the structure field of building, thesteel-concrete-steel sandwich composite wall is just applied rarely inengineering practice, and its design and application are both based on detailedengineering and research, which lacks specific standard, and the relatedresearch has not been deeply researched. According to this problem, the mainworks and results of this dissertation are as follows:1. Based on the related finite element theory and method, and accordingto the existing achievements, the finite element numerical simulation model isbuilt. In this model, material and geometric nonlinear of the steel have beentaken into account, the interaction between concrete and steel plate which areconnected by stud and binding bar is simulated using related unit. In thisdissertation, the finite element calculation results and experimental results arecompared between the two groups, and in the results, the strength peak valuethrough finite element calculation are consistent with the experiment well, soit is feasible to build the finite element analysis model to analysis the axialcompression behavior of steel-concrete-steel sandwich composite wall.2. A4-group-stee-concrete-steel sandwich composite wall monotonicaxial compression experiment is performed according to antecedent finiteelement numerical simulation result, appropriate experimental device waschosen and appropriate specimens loading and measurement scheme weremade. In the experiment, the specific buckling behavior of surface steel plate,the deformation characteristics of specimens, the capacity of strength andfailure modes were studied, and the reasons of the difference of4specimens’experimental phenomena and mechanical performance were analysed. In theresults,the structure form of steel-concrete-steel sandwich composite wall issufficient to meet the requirement of that steel plates and concrete could worktogether in good performance; and the specimens’ failure presented in topregion because of the characteristic of design, the materials’ inhomogeneity and construction defects.3. The4-group experiment results and steel-concrete-steel sandwichcomposite wall monotonic axial compression behavior are studied. In thisstudy, different specimens’ stress pattern and strength peak value arecomprehensively compared. In the next, this dissertation summarized therelationship of steel plate critical buckling load and width-thickness ratio aswell as the relationship of strength peak value and width-thickness ratio, andthen compared the experimental relationships with the existing law. In theresults, steel plate critical buckling load and strength peak value decreasewith increasing width-thickness ratio; and the existing law doesn’t fit thisexperiment’s result, and this dissertation presents a computation method ofstrength peak value in view of the finite element calculation results.