Abstract
Arch-supported prestressed grid structures, composed of steel arches, latticed shells, cables and hangers, are capable of covering large spans with good mechanical performance. Because of the many prestressed cables and hangers, structural analysis of the whole pretensioning process is rather difficult and important. Based on the structural characteristics, this paper develops the stiffness equation, and brings forth mixed influence matrix and iterative approximation methods to determine the initial deformations of cables and hangers. A sequential analysis method is then developed to analyze both batched tension and repeated tension schemes, so as to determine the active and passive forces in the cables and hangers during the pretensioning process. A case study, the Yangtze River Flood-control Model-testing Hall, proves that the proposed methods can efficiently model the whole pretension process for arch-supported prestressed grid structures.
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