Double-jack-stay inwards-concave rope arch structure

Abstract

The invention discloses a double-jack-stay inwards-concave rope arch structure. The double-jack-stay inwards-concave rope arch structure comprises an upper chord beam, a lower chord stay cable and jack stays, wherein the lower chord stay cable is composed of multiple sets of short stay cable bodies, the short stay cable bodies and the upper chord beam are located in the same plane, each set of short stay cable bodies includes two stay cable bodies, the lower ends of every two corresponding cable bodies are connected to form the shape of V, and the upper ends of every two corresponding cable bodies are hinged to the upper chord beam; two jack stays are upwards arranged between the connecting points between the lower ends of every two corresponding stay cable bodies and the upper chord beam, and arranged on the two sides of the angular bisector of the two corresponding stay cable bodies symmetrically, and the rear stay cable body in a previous set of short stay cable bodies and the front stay cable body in a later set of short stay cable bodies are arranged in a crossed mode. According to the double-jack-stay inwards-concave rope arch structure, a traditional long stay cable is omitted, the multiple stay cable bodies are used instead, after one stay cable body loses efficacy, the whole structure cannot immediately lose efficacy due to the connection relation between other stay cable bodies and the upper chord beam and the connection relation between the stay cable bodies and the jack stays, the anti-collapse performance is improved, continuous collapse can be prevented, and the potential safety hazards are eliminated.

Description

technical field [0001] The invention relates to a cable arch structure, in particular to a double brace internal 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 up...

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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