Double-layer column surface net shell with lower chord being prestressed stay rope

Abstract

The invention discloses a double-layer column surface net shell with a lower chord being a prestressed stay rope. The double-layer column surface net shell comprises a double-layer column surface net shell body and inclined towing ropes, wherein the double-layer column surface net shell body consists of upper chord rods, web rods, lower chord rods, lower chord ropes, upper-chord bolt ball nodes and lower-chord bolt ball nodes; the upper chord rods and the web rods are connected by the upper-chord bolt ball nodes and the lower-chord bolt ball nodes to form a regular quadrangular pyramid; the lower chord rods are arranged along the long-span direction of the double-layer column surface net shell body; the lower chord ropes are arranged along the short-span direction of the double-layer column surface net shell body; the double-layer column surface net shell body is supported by adopting the peripheries of the lower chords; the inclined towing ropes are symmetrically arranged in the double-layer column surface net shell body; the lower ends of the inclined towing ropes are anchored on downward-bearing type support nodes in the short-span direction of the double-layer column surface net shell body; the upper ends of the inclined towing ropes are connected with upper-chord fixing nodes. The double-layer column surface net shell disclosed by the invention has the characteristics that the prestressed effect is obvious, the indoor redundancy space in a building is not increased, the used steel amount is low, and the adaptability to air-suctioning load can be achieved.

Description

Technical field [0001] The invention belongs to a prestressed reticulated shell structure in the technical field of large-span roof structures, and particularly relates to a double-layer cylindrical reticulated shell with a lower chord as a prestressed cable. Background technique [0002] The prestressed reticulated shell structure is a new type of space structure, which introduces the prestress technology into the space steel structure and expands the application scope of the prestress technology. Prestressing and spatial structure can be regarded as the new technology and new system of civil engineering industry. Therefore, the prestressed spatial reticulated shell structure combining the two represents the latest achievements in civil engineering. The cable pre-stressed reticulated shell structure is a structural system formed by configuring high-strength pre-stressed cables according to actual needs in the ordinary reticulated shell structure, and introducing pre-stress local...

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Problems solved by technology

[0003] At present, the prestressed cables are mostly arranged outside the reticulated shell structure, which requires additional space, which will increase the height of the prestressed reticulated shell structure. In order to ensure the indoor net height, the height of the building must be increased, and the cost outside the reticulated shell structure will be increased; at the same time The additional support members and nodes that need to be added often give people a sense of depression, and the architectural use, decorative effect and economic benefits are poor

[0004] In addition, the internal force of each lower chord member of the reticulated shell after prestressing is different under the action of external load, but now the general prestressed reticulated shell structure of the cable only applies the same prestress to the lower chord or part of the lower chord, which will The strength of structural materials cannot be fully utilized, and the amount of steel used increases, resulting in waste of materials

[0005] Furthermore, the cable prestressed reticulated shell structure is a wind load sensitive structure. For modern large-span buildings, the cable prestressed reticulated shell structure with a light roof system is generally used. Under the action of wind suction, the lower string cable may be loose or under pressure and quit working. The self-balancing system does not exist, and the safety degree is lost. Therefore, it is often necessary to prepare weight on the roof to ensure that the structure does not lose stability and safety under the action of wind suction. degree, so the existing cable prestressed reticulated shell structure is not suitable for the action of wind suction

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