Abstract
Superlarge span structure is one of the important trends for future building development. Under the background of the 800-meter superlarge span dome project proposed by China Construction Group, this paper focuses on the structural optimization and performance analysis of this superlarge span structure. The previous ideas of the superdome and the maximum span of existed spatial structures are reviewed, and some structural form selection principles are put forward which lay foundation for structural selection. The applicability of high-strength steel and aluminum alloy is also discussed. It is demonstrated that the high-strength steel and aluminum alloy contribute little to structural comprehensive performances. Then, considering the effects of grid division, members topological relation, and surface shape, six kinds of rigid systems are contrastively studied to determine the optimal scheme. The structural performances along with the increasing span are explored in detail. To further reduce the structural weight and improve mechanical performance, a new composite scheme and the cable-stayed megastructure are proposed and studied. The research methods and performance analysis results can provide significant references for the following research on the superlarge span structure.
Highlights
As new materials and advanced engineering technologies increasingly emerge, the development of the large span spatial structure has made great strides and the concept of the superlong span dome has been put forward
Fuller put forward a famous project named “Manhattan dome” [1]
To resist hurricanes and heat waves, American engineers proposed to build a superdome in the size of 1600 m diameter and 450 m height over Houston [3], as shown in Figure 1(b). e design consulted the three-layer structure of the Garden of Eden in Britain
Summary
As new materials and advanced engineering technologies increasingly emerge, the development of the large span spatial structure has made great strides and the concept of the superlong span dome has been put forward Such a superdome can keep a warm and humid climate inside even when built in the cold and dry area. It consists of a number of huge arch trusses covered by the light cable membrane structure [4]. Six rigid structural systems and two rigid-flexible composite schemes are studied by the numerical method. e changes of structural performance along with the increasing spans are given. en, the optimum scheme for the 800 m span superdome, in certain conditions, will be obtained through contrastive analysis
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