Concave cable-arch structure

Abstract

The invention discloses a concave cable-arch structure. The concave cable-arch structure comprises an upper chord beam, a lower chord inhaul cable and a supporting rod. The lower chord inhaul cable is composed of a plurality of sets of short inhaul cables. The short inhaul cables and the upper chord beam are located in the same plane. Each set of short inhaul cables comprises two stay cables, wherein the lower ends of the two stay cables are connected together to be of a V type, the upper ends of the two stay cables are hinged to the upper chord beam, the connecting point of the lower ends of the two stay cables is upwards provided with a supporting rod between the connecting point and the upper chord beam, and the supporting rod is arranged on the angular bisector of the two stay cables arranged in the V type. A rear stay cable of a last set of short inhaul cables is crossed with a front stay cable of a next set of short inhaul cables. Traditional long inhaul cables are omitted and replaced with the stay cables, when a certain stay cable loses efficacy, the whole concave cable-arch structure will not immediately lose efficacy due to the connecting relation between the other stay cables and the upper chord beam and between the other stay cables and the supporting rods, collapse resistance is improved, continuous collapse can be avoided, and potential safety hazards are eliminated.

Description

technical field [0001] The invention relates to a cable arch structure, in particular to a concave cable arch structure. Background technique [0002] At present, there are more and more applications of long-span steel structures in the field of civil engineering. However, with the increase of the span, the self-weight increases sharply, and the structure faces the contradiction of the mutual restriction of the use function, design rationality and economic indicators. In order to meet the function of the structure and reduce the structure's own weight to improve the rigidity of the structure, prestressed string beams equipped with cables are more and more used in long-span steel structures. Through the arrangement of prestressed cables and struts, the bearing capacity and stiffness of the long-span steel structure have been greatly improved. [0003] Existing cable-arch structures such as figure 1 As shown, the existing string girder includes the upper string beam 1 (or a...

AI Technical Summary

Problems solved by technology

[0006] In general, there is one or more layers of PE protective layer on the surface of the cable 2, which is chemically unstable relative to the steel, so even if the friction force between the cable clamp 4 and the cable 2 is large enough during construction, it will not It can only keep the strut 3 vertical for a certain period of time, even if the friction test is done at that time, and the requirements are met, due to the chemical instability of PE, chemical changes (such as chemical decomposition, aging) will occur quickly, resulting in The cable slips at the connection point between the strut 3 and the cable 2, causing the cable 2 to become loose, thereby causing structural safety hazards

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