Cable membrane structure shape finding design method based on particle swarm optimization algorithm

Abstract

The invention discloses a cable membrane structure shape finding design method based on a particle swarm optimization algorithm, and the method comprises the following steps: selecting the particle swarm optimization algorithm as a basic method for the shape finding of a cable membrane structure through employing a numerical simulation method, determining the optimization steps and flow, and building a cable membrane structure optimization model. Three surfaces with different projection shapes, namely a rotary catenary surface, a saddle surface and a rhombic hyperboloid, are selected as examples, and a shape-finding analysis model of the cable membrane structure is established by a self-programming method; a shape finding form diagram and a membrane surface stress distribution diagram areobtained through shape finding optimization analysis, and a calculation result and an analysis value determined by the particle swarm algorithm for structure shape finding are further obtained, and thus further confirming a membrane initial prestress value with an optimal membrane surface shape finding result and obtaining an optimal cable membrane structure initial shape. And load analysis is performed on the cable membrane structure, and a judgment criterion of the cable membrane structure wrinkling is researched. Through wrinkle analysis on a typical cable membrane structure, the processingmethod for avoiding wrinkles is obtained. Therefore, the optimal shape finding of the cable membrane structure is achieved.

Description

technical field [0001] The invention relates to the technical field of cable-membrane structures in the construction industry, in particular to a form-finding design method for cable-membrane structures based on a particle swarm optimization algorithm. Background technique [0002] As a new type of modern public building structure, the cable-membrane structure is getting more and more attention and application in our country. The cable-membrane structure is a new type of architectural structure developed in the middle of the 20th century, which is composed of high-strength flexible membrane materials and reinforced components (such as steel columns, steel cables, etc.). Using certain construction techniques and methods to generate different pre-tensioning stresses inside the membrane material, so that the membrane material has a certain shape, thus forming a certain form of spatial structure. [1] . [0003] Different from the traditional rigid building structure, as a flex...

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Problems solved by technology

Among them, the force density method can determine the "force density value" through multiple complicated trial calculation processes, and it converts the nonlinear equation that appears in the calculation process into a linear equation, and the calculation accuracy is relatively low.

The time interval of each iteration used in the dynamic relaxation method needs to be set through trial and error, which makes the calculation efficiency low

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