| RC frame-shear wall(frame-core wall)shows excellent ability on collaborative work because of good performance on double resistance to lateral force by connecting with floors on the plane.When enter into the stage of elastic-plastic,the proportion of frame and shear wall(frame and core wall)sharing the storey shear changes greatly for internal force redistribution of the structure,and varies largely with different stiffness characteristic value."High regulation" 8.1.4 and 9.1.11 has specified the methods to modify the proportion of storey shear of frame-shear wall and frame-core wall,but this adjustment is based on a large number of engineering experience,its rationality and applicability remain to be verified by analyzing the structure model.Firstly,comparing the destruction test results of 3 across 4 layer reinforced concrete frame-shear wall with the results through finite element analysis,the feasibility and applicability of the theory and the program of degenerated three-dimensional solid virtual laminated element was verified.Then,three frame-shear wall structure finite element models with same axial compression ratio and different stiffness characteristic value(shear distribution ratio of bottom frame is 21%,17%,9%)were improved to simulate real force condition of the structure accurately,and carry out data post-processing analysis,delve into the procedural failure mode of structure crack,reinforcement yielding,load-displacement relationship,the law of lateral stiffness degradation and shear force distribution changes of frame and shear wall along the structure,and combine with small,medium and large earthquakes to consider shear distribution ratio of the frame and proposed related opinion for structural seismic design.After that,three 30 layer frame-core wall model with same axial compression ratio and different stiffness characteristic value(shear distribution ratio of bottom frame is 22%,18%,10%)were established by using PKPM software,and pick out 6 layer at the bottom of the matrix model for finite element modeling by three-dimensional solid virtual laminate element method,to discuss the ultimate bearing capacity,story drift,lateral stiffness degradation under the space form of frame-core wall under horizontal load and shear force distribution changes of frame and shear wall during the loading process and along the structure,focused on the mechanical characteristics of lower-two story and contrast with the adjustment listed on Chinese design code about storey frame shear of frame-core wall structure and drew relevant conclusions.By using three-dimensional refinement nonlinear finite element analysis,the law of lateral stiffness degradation with considering space collaborative work between beam,plate,column and wall of RC frame-shear wall(frame-core wall),the changes of horizontal shear force redistribution,the association between the above two were concluded;The law of shear force distribution under ultimate load of RC frame-shear wall or frame-core wall structure with different stiffness characteristic value and the comparison with Chinese current design code were carried out to provide reference for structural seismic design theory. |
PDF Full Text Request