Mast stability design method based on random defects

Abstract

The invention relates to a mast stability design method based on random defects. The method comprises the following steps: (1) designing a mast structure; (2) confirming defect distribution parameters according to the mast structure, and then establishing an initial defect vector according to the defect distribution parameters; (3) determining a limit load factor distribution parameter according to the initial defect vector; and (4) calculating a failure probability according to the limit load factor distribution parameter, comparing the failure probability with a stability design requirement, judging whether the mast structure meets the stability design requirement or not, if yes, ending the design, and otherwise, returning to the step (1). Compared with the prior art, the method has the advantages that the reliability of the mast can be quantitatively evaluated, the evaluation result is accurate, the operability is high, and the physical experiment cost is saved.

Description

technical field [0001] The invention relates to a mast stability design method, in particular to a mast stability design method based on random defects. Background technique [0002] The mast structure is a light structural system. In the mast structure, the structure is mainly tension and compression, which can achieve the maximum structural efficiency with the least material. [0003] The basic principle of the mast structure to achieve load is to bring additional stress stiffness through the tension and compression balance of the cable-strut system, so that when the structure deviates slightly from the original position, the unbalanced internal force increment will pull the structure back to the original position, thereby bringing to overall stability. [0004] In order to obtain this additional stress stiffness in the mast structure, it is often necessary to exert a huge tensile pressure in the cable rod. For the cable under tension, this is generally only strength con...

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Problems solved by technology

[0005] Existing stability design methods are generally empirical design or safety factor design methods. The ultimate bearing capacity of the mast is obtained through linear or nonlinear analysis. If a certain criterion is met, such as a given load factor limit, then it is considered The structure is safe, but these design methods can only give a qualitative judgment on the stability of the mast, and cannot give a reliable indicator quantitatively, especially for construction projects with large site errors and low precision, this qualitative analysis is insufficient. Confidence in the security of the design itself

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