Dissertation
Dissertation > Transportation > Road transport > Bridges and Culverts > All kinds of bridges > Bridges: the material points > Steel bridges and other metal bridge

Research on the Multiple-Track Coefficinet for the Fitigue Calculation of Railway Steel Bridges

Author ZhangAnHu
Tutor LiQiao
School Southwest Jiaotong University
Course Bridge and Tunnel Engineering
Keywords Railway Steel Bridge Fatigue Damage accumulation Multi-line coefficient Multi-line impact factor Range Method Monte Carlo method
CLC U448.36
Type Master's thesis
Year 2011
Downloads 43
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With the development of transport , a growing number of four - and six-lane railway bridges have been built, multi-line train at the same time the role of the impact of structural fatigue damage on the bridge has become an urgent research topic . In this paper, on the basis of existing research results , using the range method and Monte Carlo method , multi-line railway steel bridge fatigue strength check calculation coefficient and describes their advantages and disadvantages and scope of application of the two methods . First , certain assumptions based on the range method to establish the mathematical model train bridge encounter , solve the encounter probability and frequency of train on the bridge , combined with Miner linear cumulative damage theory derived operators of Q train bridge damage caused , according to the definition of multi-line coefficient derive the formula for calculating the coefficient of railway bridges two-wire, three-wire , four-wire . To facilitate the practical engineering applications , multi-line coefficient summarized as a formula and calculate the forms . Known by the poor law analysis , the factors that affect the coefficient of the multi-line there are two categories : the first category of factors associated with the bridge , including the bridge span bridge in which the location of two parameters ; second category of factors and train the way they operate , including the type of train , speed, departure time interval parameters . By collecting data , using the Monte Carlo method to simulate the two-wire and four-wire train operators , and more than a few parameters of the multi-line coefficient . By analyzing the simulation results of the four - line railway , with the meet to correct multi-line train run on multi-line bridge fatigue damage coefficient k ' . Than the multi-line coefficient k. More regularity and stability , we propose to use four-wire the influence coefficient k'n instead of four - line coefficient kn multi-line train at the same time to consider the role of bridge structural fatigue damage . Finally, using the ANSYS , and MIDAS finite element software to establish two-wire and four-wire steel truss cable-stayed bridge model , compare lane coefficient calculated using the range method and norms simplify calculated the difference between the two - coefficient ; concurrently using the Monte Carlo method to calculate the the railway bridge four-wire the coefficient k4 and four-wire influence coefficient k'4 steps .

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