Concrete T-shaped beam post-fire damage evaluation method

Abstract

The invention discloses a concrete T-shaped beam post-fire damage evaluation method, and relates to the technical field of post-fire building damage grade evaluation methods, and the concrete T-shapedbeam post-fire damage evaluation method comprises the following steps: 1, determining parameter indexes; 2, according to the determined parameter indexes, obtaining the comprehensive closeness of each evaluation object by utilizing a plurality of evaluation methods, wherein the multiple evaluation methods comprise an improved analytic hierarchy process, an entropy weight method, an approximate ideal solution, a deviation quadratic sum optimization method, a grey relational degree method and an orthogonal projection method; and 3, finally determining the damage grade of the building accordingto the comprehensive relative closeness of each evaluation object. According to the concrete T-shaped beam post-fire damage evaluation method, a set of comprehensive evaluation system of a grey relational degree correction improved approximate ideal solution (MTOPSIS-GRA) method based on the optimal combination weight is established, so that the evaluation result is more objective, and the technical defects of the evaluation method in the prior art are avoided, and the concrete T-shaped beam post-fire damage evaluation method is suitable for engineering application and popularization.

Description

Technical field [0001] The present invention relates to the technical field of building damage grade evaluation methods after fire, and in particular to a method for evaluating fire damage based on concrete T-beams. Background technique [0002] In recent years, building fire problems are more common. In order to reduce losses and prevent fires, relevant experts have made relevant studies. However, there are few studies on the damage rating of buildings after fire and the repair work after disasters, and they have reference value. Related books and documents are relatively scarce. [0003] "Building Structure Appraisal Standard after Fire" (CECS 252-2009) is currently the most widely used and recognized national recommended standard. However, the standard basically considers the appearance of buildings after the disaster. The evaluation standard is highly subjective. The damage level determined by the appearance is more ambiguous and often depends on the subjective consciousness o...

AI Technical Summary

Problems solved by technology

[0005] Some people have also given a set of simple reduction evaluation system for each factor based on objective parameters such as bearing capacity, fundamental frequency, stiffness and fire exposure time after fire, but there is no specific solution method, and the determination of indicators has a certain degree of complexity

[0006] In addition, in the existing mathematical evaluation methods, such as the AHP, there is a defect of too strong subjectivity, while the approximation to the ideal solution (TOPSIS) has a certain degree of subjectivity because the weight information is given in advance, and in the application Easy to have reverse order problem due to new addition scheme

If the above assessment methods are directly applied to the assessment of building damage after fire, it will be difficult to obtain good assessment results

Images