Abstract
Cable-stayed bridges are one of the most popular types of long-span bridges. The structural behaviour of cable-stayed bridges is sensitive to the load distribution between the girder, pylons, and cables. The determination of pretensioning cable stresses is critical in the cable-stayed bridge design procedure. By finding the optimum stresses in cables, the load and moment distribution of the bridge can be improved. In recent years, different research works have studied iterative and modern methods to find optimum stresses of cables. However, most of the proposed methods have limitations in optimising the structural performance of cable-stayed bridges. This paper presents a multiconstraint optimisation method to specify the optimum cable forces in cable-stayed bridges. The proposed optimisation method produces less bending moments and stresses in the bridge members and requires shorter simulation time than other proposed methods. The results of comparative study show that the proposed method is more successful in restricting the deck and pylon displacements and providing uniform deck moment distribution than unit load method (ULM). The final design of cable-stayed bridges can be optimised considerably through proposed multiconstraint optimisation method.
Highlights
The main purpose of this paper is to present an effective multiconstraint optimisation strategy for cable-stayed bridges based on the application of an inverse problem through unit load method (ULM) method resulting in reduced stresses and shorter simulation times than the other proposed approaches
As the proposed method is based on the ULM, the nonlinearities of the bridge are included, and it can be used in the construction process of highly redundant cable-stayed bridges
A comparative study is conducted in this paper to compare the structural responses of the optimised cable-stayed bridge by multiconstraint method with responses derived from ULM
Summary
Among proposed iterative optimization strategies, the ULM method seems to be a prominent fundamental method for optimising the cable forces considering its easy extensibility and applicability to real construction engineering problems. The main purpose of this paper is to present an effective multiconstraint optimisation strategy for cable-stayed bridges based on the application of an inverse problem through ULM method resulting in reduced stresses and shorter simulation times than the other proposed approaches. The main objectives of this study are to determine the optimum posttensioning cable forces for cable-stayed bridges through multiconstraint optimisation method under the action of dead load and to compare the posttensioning cable forces from the ULM method and the proposed multiconstraint method
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