The Three Main Girder Continuous Steel Truss Arch Bridge Static Behavior And Ultimate Capacity

On the study of Dong Ping Bridge, a large-span steel truss arch bridge, the present paper gives an analysis of its static characteristics and ultimate bearing capacity. The main result of this paper are presented as follows:(1) On the basis of finite element analysis software ANSYS, space mechanical model of three-truss continuous steel-truss arch bridge has been established.(2) On the basis of long-span continuous steel-truss arch bridge, stress characteristics of main truss has been studied under the various conditions, such as live loads, temperature loads, braking loads and wind loads, etc. Meanwhile, the impact of various factors on the bridge has been discussed, such as the stiffness of transverse beam and combination among spans.(3)This paper gives an comparison between three-truss and two-truss continuous steel truss arch bridge, including of stiffness in two systems as well as stress characteristics of main truss members, transverse beams and lateral combination. The respective advantages and disadvantagesof the two systems has been studied at the same time.(4)The ultimate bearing capacity of Dong Ping continuous steel truss arch bridge has been analyzed by using three different ways, which are elastic, non-linear geometry, double nonlinear methods. The applied conditions of these three methods has been presented through the analysis and results of the comparison.(5) On the summary and comparison of definition of stability safety factor among the current scholars, this paper gives an suggestion of defining its minimum value.(6)Finally, the impact on ultimate bearing capacity by other parameters, such as loads form, initial defects as well as strength of materials in steel truss arch bridge has been studied.