Health Monitoring And Safety Assessment Of Long-span Spatial Tubular Truss Arch Structure

In the new era,various new landmark buildings emerge in endlessly,and more and more complex and beautiful steel structures emerge.However,with the growth of service time structure,load and dead weight,under the long-term effects of the steel structure will be damage,damage accumulation may lead to sharp decline in steel structure performance failure,even life safety of the country’s property and urban residents caused great impact.Therefore,long-term monitoring and safety assessment of landmark buildings is of great significance.This paper first introduces the theory of health monitoring for the spatial truss arch structure,and uses the analytic hierarchy process to evaluate the health condition of the structure.After comparing and summarizing the commonly used sensors selected for the project of intelligent sensor,through the intelligent instruments and equipment monitoring of the structure of the cable force,linear,modal,arch foot constraints and other related content,through the analysis and comparison of sensor placement method to choose the MAC method to optimize the sensor layout,combined with finite element analysis of the structure health monitoring system has been established.The finite element model of steel truss was established according to the design parameters.Again according to the measured cable force,linear,arch foot constraint conditions is to establish a finite element model of the revised in correcting validation completed real value at the same time,also verify the correctness of the measured modal model.In this paper,the structure of cable and structure is monitored and the safety assessment is made.The method used in the monitoring of cable forces is the frequency method.Using power spectrum and frequency difference method and the random reduction method was carried out on the relevant data collected and cable processing,on the basis of tension string theory to tackle the problem of frequency response lasso knows all the cable hanger forces value,through simulation and comparison of cable force value after the process of safety assessment.From the frequency equation of undamped multi-degree-of-freedom system and static correction method of structural dynamic characteristics,through the monitoring to the power spectral density curve and curve of cross power spectrum density analysis monitoring frequency and modal characteristics,comparing with the theoretical value and the modal of different lines under comparative safety assessment results.The main research work of this paper is to analyze and identify the damage site and content of the arch structure of the large span space tube truss and make a safety assessment.Conclusion the monitoring and evaluation of the actual project have certain reference significance.