Ancient architecture timberwork residual life reliability prediction method suitable for corrosion environment

Abstract

The invention relates to an ancient architecture timberwork residual life reliability prediction method suitable for a corrosion environment. The method comprises the following steps that (1) a material time varying model under the corrosion influence is analyzed; (2) a corrosion-considered resistance model is built; timberwork bearing capacity life prediction is achieved, prediction results are amended by using a monte carlo method combining with a probability density function, and residual life interval prediction of a structure is achieved; (3) a corrosion-considered deformation time varying value is obtained by using finite element simulation, and based on a Weibull model, combining with the monte carlo method, the reliability life prediction of a structure deformation value is achieved; (4) an earliest age limit when the structure loses efficacy most likely is decided. According to the method, the range interval of the ancient architecture timberwork terminal life with corrosion and worm damage influence considered can be given, and accordingly decisions such as disaster prevention solution programs and repairing and strengthening are made; material level residual life prediction is achieved by considering the bearing capacity, the influence of a deformation value index on structure life prediction at components and even a structure level is further considered, and life prediction is accurate and more reasonable.

Description

technical field [0001] The invention relates to a method for predicting the reliability of the remaining life of an ancient wooden structure applicable to a corrosive environment, and belongs to the life prediction method in the field of health monitoring of wooden structures. Background technique [0002] The wooden structure of ancient buildings is a historical product with traditional cultural charm. Since wood is a biological material, and the ancient wooden structures in active service have been damaged by the natural environment for a long time, including external environmental damage such as temperature and humidity changes and insect erosion, resulting in more and more The wooden structure suffered varying degrees of damage. At present, based on the degradation of component cross-sectional strength caused by corrosion factors, the time-varying calculation method of the Gerhards cumulative damage model is commonly used in the field of ancient buildings. Since Gerhards...

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Problems solved by technology

However, the above prediction method only obtains the definite life point time, and the life span in the real situation inevitably has a certain degree of discreteness.

On the other hand, the safety assessment of existing buildings is not only reflected in the assessment of the structural bearing capacity, but also includes the assessment of the structural deformation capacity, and the ultimate life research in this field is based on reaching the limit of the bearing capacity as the failure or destruction criterion. Considering the failure criteria of wooden structures and components reaching the extreme deformation value under the limit state of normal service

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