Research On Seismic Performance Of Reinforced Concrete Structures Considering Torsion Effect

Shear wall is the main horizontal load-resistant component in frame-shear wall structures,and there are many factors affecting the seismic performance of shear wall structure.Combined with the relevant research results at home and abroad,based on quasi-static method and time-history method,this paper analyzes the effect of torsion on seismic performance of reinforced concrete shear wall,plane frame shear wall structure and space frame shear wall structure by ABAQUS finite element software and subroutines,and studies the influence of torsion on seismic performance of these structures.The main work and conclusions are as follows:(1)According to different shear span ratio,axial compression ratio and reinforcement percentage,the finite element model of reinforced concrete shear wall is established for static and dynamic time history analysis,seismic performance analysis of shear wall,as well as stress and strain analysis of material.The results show that the ultimate bearing capacity and energy dissipation capacity of the specimens decrease with the increase of torsion,and the influence of torsion on the seismic performance of specimens decreases gradually with the increase of shear span ratio.Moreover,when the axial compression ratio is small,the torsion has little effect on the seismic performance of specimens,while the torsion has a significant effect on the seismic performance of specimens when the axial compression ratio is large.In addition,influenced by the initial angle of torsion,the stress distribution of the reinforcing bar changes obviously and the maximum axial tensile stress increases.(2)ABAQUS finite element software is used to analyze static and dynamic time history of plane frame shear wall structure.The research shows that the change of seismic performance of plane frame shear wall structure is consistent with that of reinforced concrete shear wall under the influence of torsion.Meanwhile,the stress and plastic strain of frame columns at both ends increase.(3)ABAQUS finite element software and subroutine,as well as time history analysis method are used to analyze the dynamic time history of L-shaped irregular space frame shear wall structure,and the influence of earthquake motion on seismic performance of structures is reversed by analyzing translational displacement,rotational displacement and stress response.The results show that the rotational component of earthquake motion has little effect on the overall stress of structures,but it leads to uneven stress of the internal components of structures,and the stress level of some components is significantly higher than that of other components.