Crack Simulation And Safety Evaluation Of Suspension Bridge High Tower Column

Due to the temperature difference between inside and outside the tower box, andimproper structure, causes cracking situation of suspension bridge tall tower morecommon in our country.While the existing norms is inadequate, therefore for thesuspension bridge tall tower, proposed the scientific evaluation system is greatsignificance.This article followed the forefront of scientific research, proposed towercrack simulation analysis method to directly assess the security of the suspension bridgetall tower. And combination of crack monitoring and image acquisition technology,envisaged form a set of suspension bridge tower safety monitoring and evaluationsystem.Basede on the analysis of the structure forms and materials, the forcecharacteristics and the impact of tower safety factors, proposed the most significant andmost intuitive to impact tower safety is cracks information of the tower. And analyzedthe causes of cracks in detail.The image acquisition of the suspension bridge towercracks is achieved through the rail car and HD cameras. Then changing the crack imageinto a digital image; Then Based generalized structure and expansion of morphologicalfiltering principle, working the binarization and cracks extraction, image stitching.Finally, using the left and right edges to calculate the crack width, and propose themethod of to quantify the storage and simulation to reproduce, lay the foundation forlong-term health health assessment of the suspension bridge tower. Before thesuspension bridge tower crack simulation, firstly, use Madis/Civil2010to establish thesuspension bridge overall model, analyze tower internal force, find the mostunfavorable segment of the tower, And in accordance with the actual investigation tointegrated determine the tower segments for crack simulation analysis. Through set upthe basic assumptions and reinforced concrete constitutive relationship and concretefailure criterion, choose the finite element model of reinforced concrete and the crackmodel, and choose the concrete element, link element, combine element, articulatedtower structure crack width calculation finite element method,and the last establishfracture simulation analysis model. Based on the fracture and column bearing capacityrelationship and tower crack bearing capacity reduction factor, assess and analysis thesafety of suspension bridge tall tower.Study on the objective, scientific assessing safety status of the suspension bridge the cracking tall tower have positive reference function, and application prospect.