Super-large-span heavy-load prestressed space truss based on topological optimization principle

Abstract

The invention relates to a super-large-span heavy-load prestressed space truss based on the topological optimization principle. The super-large-span heavy-load prestressed space truss comprises a truss body, arc-shaped inhaul cables and vertical supports. The super-large-span heavy-load prestressed space truss is characterized in that the truss body is an arch bridge-shaped three-dimensional truss, and the arch bridge-shaped three-dimensional truss comprises an upper chord member, an arch-shaped lower chord member and a truss web member; the arc-shaped inhaul cable is divided into a first arc-shaped inhaul cable and a second arc-shaped inhaul cable; the vertical supports adopt a V-shaped support and a U-shaped support; the contact area of the first arc-shaped inhaul cable and the second arc-shaped inhaul cable is hinged to the truss arch-shaped lower chord through the V-shaped support, and the separation area of the first arc-shaped inhaul cable and the second arc-shaped inhaul cable is hinged to the truss arch-shaped lower chord through the U-shaped support; and the end part of the first arc-shaped inhaul cable and the end part of the second arc-shaped inhaul cable are connected with a joint plate on the truss through lug plates and pin shafts, the lug plates are connected with the inhaul cables through cable heads, and the joint plate and the truss are welded in an inserted mode.

Description

technical field [0001] The invention relates to the technical field of structural engineering steel structures, in particular to a super-large-span heavy-load prestressed space truss based on the principle of topology optimization. Background technique [0002] With the rapid development of the economy and the construction of a large number of long-span space structures, the buildings are developing in a comprehensive direction with complex shapes and diverse functions. Long-span structural roofs are not even satisfied with just light roofs. At the same time, considering the requirements of green building roof greening, long-span structural roof structures also need to carry large loads, forming a heavy-duty roof. However, using traditional steel trusses and grids The amount of steel required for the structure increases significantly, thereby increasing the construction cost, and cannot satisfy the architectural aesthetic effect. In the long-span structure, the use of conve...

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Problems solved by technology

[0003]The long-span roof structure needs to carry a large load, but the use of traditional steel truss and grid structure requires a significant increase in steel consumption, and the structural cost is extremely high. And can not meet the problem of architectural aesthetics, the present invention proposes a super-large-span heavy-load prestressed space truss based on the principle of topology optimization; A mathematical method for optimizing material distribution in a given area; the initial and most important step in topology optimization is to find an efficient topology. We start with the bending moment diagram and shear force diagram of traditional mechanics to make the force transmission path clearer , making the structure more efficient; the typical feature of a long-span roof structure is that the mid-span area mainly bears the bending moment, and the support area mainly bears the shear force. We design the shape of the super-long-span heavy-duty prestressed space truss to be very close to the bending moment diagram , to form an efficient topological form, to ensure that under normal use, the upper chord, arched lower chord, and vertical support of the truss bear pressure under the action of the roof load, the diagonal web bars of the support bear greater shear force, and the cables bear tensile force, so that The trusses and curved cables work together to make the entire structure very efficient

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