| The finite element program based on the three-dimensional solid degenerate virtual merging element nonlinear finite element analysis method is used to calculate the RC frame structure and frame shear wall structure subjected to horizontal loads and the RC frame structure and slab-column structure subjected to vertical loads.The nonlinear finite element simulation analysis is carried out.The applicability and accuracy of the RC structure are verified by the simulation and simulation results and the experimental results.In order to analyze the effect of floor slab opening and stiffness eigenvalue on the anti-side performance of RC frame-core tube structure,three sets of performance targets are designed for C different stiffness eigenvalues ??(the underlying frame shear sharing ratio is about 9.5%,18.7% and There are 9 models in each group.Each model considers three kinds of opening ratios: no hole opening,bottom floor slab opening and bottom two floor slab opening.It is first tested by SATWE and ETABS analysis software to verify the results.Reliability,and then using the 3D solid degenerate virtual merging unit method to model,considering the synergistic working effect of the beam-slab column wall,the model is analyzed for anti-side performance.The results show that the ultimate load and ultimate displacement of the structure decrease with the increase of the opening rate,and the weak layer also moves down.The rate of stiffness degradation of the core tube of each floor is basically larger than that of the frame.The core tube and the frame play a good role in the two earthquake-resistant lines.The top layer has a higher shear rate than the core tube because the frame bears higher shear force than the core tube.The greater the opening rate,the more severe the frame stiffness degradation of the opening layer and its adjacent floor,the weakening of the core tube stiffness,and the weakening of the overall shear force distribution.When the opening ratio is the same,the larger the stiffness characteristic value,the stronger the structural shear force redistribution phenomenon.The model with the underlying shear sharing ratio of 18.7%,no hole opening and performance target C is the basic model,and the two models with the same stiffness eigenvalue and opening rate but the performance objectives of B and D respectively are compared and analyzed by finite element analysis.The results show that the higher the performance target(B>C>D),the greater the ultimate bearing capacity of the structural level,the smaller the ultimate displacement,the lower the corresponding ductility,and the higher the seismic safety reserve of the structure.The higher the performance goal,the lower the degree of structural frame and core tube stiffness degradation,but the weaker the structural shear force redistribution.The three-parameter three-level orthogonal test method is used to comprehensively consider the influence degree of stiffness eigenvalue,performance target and opening rate.The three levels of stiffness eigenvalue show that the underlying frame shear sharing ratio is about 9.5%,18.7.About % and 26.5%,the performance target three levels are D,C,B.The three levels of opening rate are not open,one layer of opening and two layers of opening.A total of nine finite element models are considered,and the ultimate bearing is obtained.Force and displacement.The results show that the influence of three parameters on the structural anti-side is:performance target > stiffness characteristic value > opening rate.The typical section is selected for the stress analysis of the slab reinforcement.It is concluded that the closer the core tube and the main beam are,the higher the effect of the space cooperation effect is.The beam of the main beam is“T-shaped spar + the stress of the two sides of the membrane”.Force mechanism,most of the rest of the floor is in an "eccentrically pulled" state. |
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