Collapse Analysis And Safety Evaluation Of Stadium Truss

With the increasing degree of social modernization,people have a higher pursuit of the safety and beauty of the building structure.Because the large-span structure can achieve a perfect combination of beautiful body shape and reasonable space force,many construction engineers and structural engineers very much favor this structural form.Most of the spatial structures are high degree of personnel concentration and frequent public activities,and the number of constructions is increasing.The frequency of accidents in existing and new structures will correspondingly increase exponentially.If there is a collapse accident,it will cause immeasurable loss to people's lives and property,and will have a bad social impact on normal construction and the promotion of excellent structural forms.Therefore,the in-depth study of the direction of this topic has become particularly important.In view of the above problems,this paper analyzes the collapse of steel awning structure of Linxia Stadium and evaluates the safety of the tube truss structure.The article begins with a review of the key research methods for structural members,and then compares and analyzes the pros and cons of each method,and proposes practical and efficient methods for determining the critical members of space tube trusses;The damage discriminating method in the structure is studied to find an effective spatial structure damage identification method.Then the failure criterion of the structural member is determined by the strength criterion and the deformation criterion.The collapse analysis of the structure;Finally,according to the determination of the key elements combined with the Fuzzy method and the real-time monitoring of the data on the Linxia Stadium steel truss structure safety evaluation to give comprehensive evaluation.Through a series of finite element simulation analysis and data comparison,the following main conclusions are drawn:(1)Through the comparison of various methods in the determination of key components,the sensitivity analysis evaluation method is found to be the most universal applicability evaluation method,but it has its own disadvantages such as high contribution error and large calculation volume.In view of the shortcomings of large amount of calculation,starting from the bearing mechanism and the form of failure of the tube truss structure,an evaluation method based on the ultimate bearing capacity was proposed.A simple tube truss was evaluated for the importance of members,and the accuracy of the evaluation method based on the ultimate bearing capacity was verified.The results show that this method is more accurate than other evaluation methods,and the amount of calculation is small,which facilitates the analysis of actual projects.(2)Case analysis is performed on a stadium based on the natural mode change and wavelet analysis.Analysis of the results found that if there is less damage in the overall structure,the current mainstream methods are not easy to find the existence of damage.However,based on the wavelet analysis method can be very effective to avoid this problem,as long as the structure damage,combined with real-time monitoring data through this method can be found in the location of the damage and the degree of damage.(3)Through the collapse analysis of the stadium tube trusses,the main support truss support and the lower chord in the long span space tube truss structure will result in structural collapse of the sensitive member,as the two types of members are in use.The pressure is the main factor,and the possibility of tension is not ruled out,leading to stress failure and instability.The failure of the material properties of the rods to fully play can lead to the destruction of the rods,and the possibility of damaging the rods is very high.Once it is out of work,it will directly lead to the collapse of the overall structure.However,the upper chord,web-bar,etc.,will be mainly subjected to tension in the normal use of the structure.If the damage of the rod will maximize the performance of the material,it will relatively reduce the possibility of damage,of course,When one of these rods in the main truss breaks,it will not collapse the structure,but its destruction may lead to the destruction of the surrounding rods.When adjacent rods around it are damaged,it may also cause The structure collapsed.(4)Based on the structural characteristics of the stadium tube truss structure,using Fuzzy comprehensive evaluation method and AHP comprehensive evaluation method,combined with a large number of on-site acquisition of real-time data analysis,the safety grade of the stadium steel awning tube truss structure during construction and normal use phase is obtained.Grade A.Assuming that the structure is damaged by rods,if the number of damages does not reach 30% of the number of rods,the structural safety level is still Class B.At the same time,it is proved that Fuzzy comprehensive assessment method and AHP comprehensive evaluation method can well evaluate the safety of stadium truss structure,and can also be applied simply and effectively in practical engineering research.