The construction stage analysis is performed in a backward sequence from the state of equilibrium as defined by the initial equilibrium state analysis. The effect of large displacements cannot be ignored during the construction stage analysis. In carrying out the construction stage analysis, large displacement theory (geometric nonlinear theory) is applied in which equilibrium equations are formulated to represent the deformed shape. This procedure is adopted because a solution can be found with relative ease within acceptable error limits in the completed state analysis.Ĭonstruction stage analysis is performed to check the structural stability and to calculate section forces during erection. This linearized analytical procedure to convert section forces to geometric stiffness is referred to as the linearized finite displacement method. It is thus possible to perform a linearized analysis for the additional static loads at the completed state by converting the tension forces in the main cables and hangers resulting from the initial equilibrium state loading into increased geometric stiffness of those components. This is due to the fact that sufficient tension forces are induced into the main cables and hangers under the initial equilibrium state loading. But it can be assumed that the bridge behaves linearly for additional loads (vehicle, wind load, etc.) in the completed state analysis. Suspension bridges exhibit significant nonlinear behavior during the construction stages. The selfweight loading in the initial equilibrium state will also be added to the total loading for the completed stage analysis. The completed state analysis of the suspension bridge is performed to check the behavior of the structure under additional loads such as live, seismic and wind loadings. The initial equilibrium state analysis will provide the coordinates and tension forces in the cables. This stage is referred to as the initial equilibrium state of the suspension bridge. At this stage, the structure is in balance under self-weight and the deflection due to the self-weight has already occurred. The completed state analysis is performed to check the behavior of the completed bridge. The analysis of a suspension bridge is divided into completed state analysis and construction stage analysis. 1) Introduction of analysis procedure of completed state analysis and construction stage analysisġ-1) Completed state analysis (Linearized Finite Displacement)ġ-2)Construction stage analysis (Backward Geometric Non Linear)ģ) Modeling suspension bridge in midas Civil
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