Local double layer open chord spherical reticulated shell

Abstract

The invention discloses a local double-layer string reticulated spherical shell, comprising an upper layer, a middle layer and a lower layer, wherein, the upper layer is a spherical surface which consists of radial bars and circumferential bars and is arranged in a heel ring grid shape, a plurality of circumferential bars are connected to form the woof of the spherical surface, radial bars are connected between connections of the radial bars of two adjacent woofs to form the warp of the spherical surface, the connections of the circumferential bars are connected with one ends of the radial bars, while the other ends of the radial bars are hinged with the top point in the center of the spherical shell; the middle layer comprises a plurality of unit pyramids which are uniformly and alternately arranged on the heel ring grid of the upper layer along the warp direction and the woof direction and have cone tops connected with circumferential ropes of the lower layer; and the circumferential ropes are in closed arrangement along the circumferential direction, and inherent stress is exerted through tensioning the circumferential ropes in the structure. The local double-layer string reticulated spherical shell has the advantages of clear structure stress, concise and permeable construction effect, is a self equilibrating system under the deadweight effect without horizontal thrust, and has each upper chord joint provided with a web member so as to improve the stability of the structure.

Description

technical field [0001] The invention relates to the field of construction, in particular to a partial double-layer tensioned string spherical reticulated shell. Background technique [0002] In recent years, with the development of prestressed steel structures, a large number of new structural forms have emerged, such as cable dome and suspension dome structure. The cable dome structure has the characteristics of simple structure, light system, and most of the components are tension members; the suspension dome is a new structure formed by combining the cable dome and the single-layer reticulated shell, which improves the structural rigidity and reduces the difficulty of construction . However, these two structural systems still have some shortcomings: [0003] 1) The upper and lower layers of the cable dome structure are flexible systems, and the rods except the struts cannot bear the pressure, which makes the construction of the cable dome very difficult. Although it has...

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Problems solved by technology

[0003] 1) The upper and lower layers of the cable dome structure are both flexible systems, and the rods except the struts cannot bear the pressure, which makes the construction of the cable dome very difficult. Although it has been around for many years, there are very few actual structures built so far

[0004] 2) In order to ensure that all the cables of the cable dome structure are under tension, a large prestress must be applied, so that the internal forces of the compression rods and edge ring beams are huge, so a very large ring beam must be installed, which increases the weight of the lower part. structural burden

[0005] 3) Since most of the rods of the cable dome structure are tensioned cables, the overall rigidity of the cable dome structure is not large, and the deformation is relatively large under the action of the load. The roofing material is generally a light-weight membrane structure, etc., and the use of roofing materials is limited.

[0007] 5) The internal force of the single-layer reticulated shell on the upper layer of the suspensive dome is passively generated by the steel cables or external loads on the lower layer, and cannot self-adjust the internal force, so that most of the circumferential members of the upper single-layer reticulated shell are passively compressed and cannot self-adjust to reduce the pressure

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