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Abstract

In this paper, a concept of optimal design considering pretension process for prestressed steel structures is discussed, and the optimization model of ‘whole process optimal design’ (WPOD) is constructed for such structures, in which the constraint condition concerns not only different load cases but also all the pretension stages. From the perspective of member initial deformation, a method to solve the constraint condition is investigated. When solving the WPOD model, design variables are divided into several levels to construct the three-level optimization method. A cable-stayed arch-truss structure and prestressed reticulated shell structure are taken as numerical examples. Results show the high efficiency and strong robustness of the three-level optimization method. If given the tensioning order of various prestressing stages, an optimal tensioning control force scheme could be obtained at the same time when the optimal structural scheme is worked out.

Keywords

prestressed steel structure optimal design pretension process three-level optimization method member initial deformation

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A Whole Process Optimal Design Method for Prestressed Steel Structures considering the Influence of Different Pretension Schemes

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