Design Optimization And Analysis Of Continuity Collapse Resistance Of Grid Structure

Compared with the traditional reinforced concrete structure,the grid structure has good seismic performance,light weight,high construction efficiency,and can be industrialized.These advantages make it more and more used in large open complex structures.However,in recent years,with the continuous occurrence of terrorist attacks around the world,unpredic Tab natural disasters,etc.,it has its own application-specific and high-security grid structure.When the overall structure collapses continuously,it will Life and property cause immeasurable harm,so it is of great significance and urgent need to study how to improve the continuous collapse resistance of the grid structure and analyze the continuous collapse resistance of the existing structure.In this paper,the research on the continuous collapse analysis of the grid structure mainly carried out the following work:(1)Summarize the existing methods of continuous collapse design analysis,improve the commonly used backup load path method,propose a failure criterion for the combination of strength criterion and deformation criterion,and further propose the ratio of the number of failed members to the number of complete structures Judging criteria for overall collapse.(2)Discuss several commonly used methods for evaluating the importance of space structural members,and propose a sensitivity analysis method for members based on concept judgment and based on the reaction force of the support in the limit state,and through a flat grid as the background,The calculation verifies the scientific accuracy of the method.Compared with the traditional method,the method greatly reduces the amount of calculation and has better practical applicability.(3)Based on the design plan of the theater "Fengshenyanyi" in an actual project,on the basis of summarizing the common frame structure and the anti-continuous collapse measures of the reinforced concrete frame structure,summing up the structural characteristics of the grid structure,and proposing it sui Tab for grid structure The measures to improve the continuous collapse resistance of the structure,the background project was optimized for the continuous collapse performance by strengthening the cross-sectional dimensions of key components and other measures,and the sensitivity analysis of the structure before and after optimization wasperformed to verify the improvement of the continuous collapse resistance before and after optimization.It also gives key detection targets for monitoring and maintenance during the daily use of the grid structure,provides reference opinions for ensuring the safety of similar projects,and provides early warning of the continuous collapse of the grid structure.(4)In the background of the "Fengshen Romance" theater optimized for continuous collapse resistance in the previous text,the finite element software ABAQUS was used to conduct static analysis,modal analysis,and dynamic analysis in three aspects of structural continuity collapse process analysis.Through analysis,it can be seen that the "Fusion of Gods" theater roof grid structure optimized for continuous collapse resistance has a high continuous collapse capacity,and the failure of a single member caused by an accidental load will not cause the structure.The whole is continuously collapsed,and the structure has good safety reserves,but the initial failure of key members will cause large fluctuations in local member stress and deformation.If the initial failure causes the failure of multiple members,the structure may be triggered.’S continuous collapse.