Comparison of backward and forward construction stage analysis procedures of cable stayed bridges

Date

2023-12-01

Author

Özen, Serkan

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In recent years, many cable-stayed bridges have been designed and built worldwide. This type of bridge design necessitates an especially good understanding of structural analysis. Firstly, the bridge is designed according to the finished configuration, and cable forces are determined. Afterwards, construction stage analysis is done to find cable forces in each construction stage. In the end, these determined cable forces in each construction stage should satisfy the desired cable forces, internal forces of the girder and pylons, and desired shape of the whole structure at the finished configuration. The analysis to determine these forces can be done in two different ways, one is backward, and the other one is forward analysis. Backward analysis starts from the finished configuration and goes back to the first stage by dismantling the structure piece by piece. In the backward analysis time dependent material properties can only be taken into account partially, and therefore they should be calculated and inserted into the analysis manually. In the forward construction stage analysis, the bridge is analyzed starting from the initial configuration and continues exactly as it is in the actual construction process. Time-dependent properties can be taken into account with small time steps in this analysis type more correctly. This thesis will investigate the forward and backward analysis of an actual cable-stayed bridge with a concrete superstructure being constructed recently in Türkiye. The differences and similarities of the results of these two different analysis methods are compared by two different software, Midas Civil and Larsa 4D were utilized for structural analysis and their differences are also discussed .

Subject Keywords

Cable Stayed Bridge, Concrete Deck Section, Construction Stage Analysis, Backward and Forward Analysis, Geometric Nonlinearity, Time-Dependent Material Properties, Cable Element

URI

https://hdl.handle.net/11511/107660

Collections

Graduate School of Natural and Applied Sciences, Thesis