Fishtail-shaped cable truss structure form control method capable of eliminating boundary deformation influence

Abstract

The invention relates to the technical field of structural design and analysis of constructional engineering, in particular to a fishtail-shaped cable truss structure form control method capable of eliminating boundary deformation influence, which comprises the following steps: performing form analysis on a fishtail-shaped cable truss structure based on a fixed boundary, and extracting displacement {dc} of a cable truss intersection point; establishing an integral structure model comprising a fishtail-shaped cable truss structure and a boundary structure, and applying displacement {dc} as temporary forced displacement to corresponding cross points in the integral structure model; iteratively correcting the initial strain of an upper string cable and a lower string cable of the fishtail part by taking the reaction force at the intersection point of the overall structure model in a balanced state as a convergence control index; and removing the temporary forced displacement at the cross point in the overall structure model, and calculating the initial state of the corrected overall structure by using the corrected initial strain of the upper string cable and the lower string cable of the fishtail part. According to the method, the influence of boundary deformation on the fishtail-shaped cable truss form can be eliminated only by correcting the initial strain of part of cables, the concept is clear, and the construction difficulty is low.

Description

technical field [0001] The invention relates to the technical field of structural design and analysis of construction engineering, in particular to a fishtail cable truss structural shape control method capable of eliminating the influence of boundary deformation. Background technique [0002] Cable structure is a type of structure composed of cables that can only be tensioned and rods that can be both tensioned and compressed. Common forms include single-layer cable nets, cable truss structures, and cable dome structures. The fishtail cable truss is a representative cable structure, combining figure 1 As shown, the fishtail cable truss is composed of upper chord cables 102, lower chord cables 103 and struts 104, and is widely used in large-span building roofs and curtain wall structures such as stadiums and exhibition halls. Different from the conventional cable truss, the upper and lower chords of the fishtail cable truss cross once near the boundary, which can provide la...

AI Technical Summary

Problems solved by technology

[0006] When calculating the initial state of the overall structure, if the zero-state configuration and initial strain obtained by the analysis of the shape of the cable structure under fixed boundary conditions are directly used, the deformation of the boundary structure under the action of the cable force will make the configuration of the cable structure in the initial state of the overall structure and the prestress deviate from the results under the fixed boundary, resulting in a deviation between the equilibrium state of the cable structure and the target requirement

Images