Abstract
Based on the nonlinear stability analysis method, the 3D nonlinear finite element model of a composite girder cable-stayed bridge with three pylons is established to research the effect of factors including geometric nonlinearity, material nonlinearity, static wind load, and unbalanced construction load on the structural stability during construction. Besides, the structural nonlinear stability in different construction schemes and the determination of temporary pier position are also studied. The nonlinear stability safety factors are calculated to demonstrate the rationality and safety of construction schemes. The results show that the nonlinear stability safety factors of this bridge during construction meet the design requirement and the minimum value occurs in the maximum double cantilever stage. Besides, the nonlinear stability of the structure in the side of edge-pylon meets the design requirement in the two construction schemes. Furthermore, the temporary pier can improve the structure stability, effectively, and the actual position is reasonable. In addition, the local buckling of steel girder occurs earlier than overall instability under load in some cable tension stages. Finally, static wind load and the unbalanced construction load should be considered in the stability analysis for the adverse impact.
Highlights
Due to advanced manufacturing technology and efficient utilization of structural materials, cable-stayed bridge has been demonstrated as an economical solution for long-span bridges and widely applied in recent decades [1]
(1) The lowest nonlinear structural stability safety factor of structure occurs in the max double cantilever stage with the value of 2.18, larger than 1.75, which meets the design requirement
(2) Both the two construction schemes meet the stability requirement, and the location of temporary pier is 204maway from 4# bridge piers, which is reasonable for increasing the geometrical nonlinear stability safety factors of structure from 20.04 to 26.15
Summary
Due to advanced manufacturing technology and efficient utilization of structural materials, cable-stayed bridge has been demonstrated as an economical solution for long-span bridges and widely applied in recent decades [1]. When the span length increases, the structural stability problem of cable-stayed bridge is more prominent. Shu and Wang investigated the stability characteristics of box-girder cable-stayed bridges by three-dimensional finite element methods taking into account geometric nonlinearity and many design parameters, such as the main span length, the cable arrangement, and the type of pylons [4]. Xi et al adopted an energy method of analysis for the in-plane ultimate load capacity of cable-stayed bridges with different deck and pylon connection patterns [7]. A number of researchers have investigated this issue from different perspectives and some important findings are generalized, almost all of them focus on the stability problem of cable-stayed bridge in completion stage. The structural stability problem of cable-stayed bridge during construction is more important and more complex. By using corotational formulation incremental method, to analyze beam-column effect and large displacement effect, ideal elastic-plastic model, and broken-line model, to analyze the material nonlinearity of steel and concrete, respectively, the structural nonlinear stability of this bridge during construction has been researched based on the nonlinear stability analysis method
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