Simulation Of Collapse Process Of Reinforced Concrete Frame Under Earthquake And Effect Of Frame Column

The collapse of reinforced concrete frame structures under earthquake is an issue of great concern in the field of civil engineering.Understanding the collapse process and mechanism of reinforced concrete structures under earthquake loads is undoubtedly of practical significance for engineering design,safety assessment and disaster prevention and mitigation.There are two main methods to simulate the collapse of reinforced concrete structures.integral and separate methods.Collapse under earthquake is a non-linear dynamic problem.The simulation involves the application of initial gravity and seismic load.Integral modeling mainly corresponds to the understanding of the overall failure mode,while separate modeling helps to understand the impact of specific characteristics of individual components on the collapse process.In this paper,the collapse process and characteristics of reinforced concrete frame structures under earthquake are simulated by integral modeling and separated modeling.Based on the separated simulation,the influence of reinforcement characteristics of the main component of frame columns on collapse characteristics and collapse resistance is analyzed in detail.Based on ANSYS/LS-DYNA,the continuous collapse process of reinforced concrete frame structures under earthquake is simulated in two models: integral model and separated model,respectively,and a comparative analysis is made.It shows that the separable model can see the damage evolution process of steel bar in the structure,and can better describe the role of the steel bar skeleton in the structural earthquake resistance,so it can reflect the damage evolution process of steel bar and concrete in the process of structural damage,and depict the interaction between steel bar and concrete.The influence of steel bar distribution,stirrup ratio,reinforcement ratio and column height on seismic collapse performance of frame structures is systematically simulated and analyzed through separate modeling.It is clarified that the stirrups of infilled columns can improve the shear resistance of two and three layers of columns,but can not delay the continuous collapse of the structure.In the case of constant reinforcement ratio of columns,increasing the number of longitudinal reinforcement of columns can make the reinforcement evenly distributed,which can improve the collapse resistance of thestructure and delay the collapse of the structure.Increasing the longitudinal reinforcement ratio of frame columns can effectively improve the structure's ability to resist continuous collapse.The higher the column height of the structure is,the weaker the anti-seismic collapse ability of the structure is,and the faster the collapse and destruction speed under the earthquake is.