A post-fire damage assessment method based on concrete T-beams

Abstract

A post-fire damage assessment method based on concrete T-shaped beams, relating to the technical field of post-fire building damage assessment methods, the steps of the assessment method are as follows: step 1, determine parameter indicators; step 2, according to the determined parameter indicators, Utilize a variety of evaluation methods to obtain the comprehensive closeness of each evaluation object; the multiple evaluation methods include improved analytic hierarchy process, entropy weight method, approaching ideal solution method, deviation square sum optimization method, gray relational degree method, orthogonal Projection method; step 3, finally determine the damage level of the building according to the comprehensive relative closeness of each evaluation object. The present invention establishes a set of comprehensive evaluation system based on the gray relational degree correction improved approximation ideal solution (MTOPSIS-GRA) method based on the optimal combination weight, which makes the evaluation result more objective, avoids the technical defects of the evaluation method in the prior art, and is suitable for Promoted in engineering applications.

Description

technical field [0001] The invention relates to the technical field of evaluation methods for building damage levels after fire, in particular to a damage evaluation method based on concrete T-shaped beams after fire. 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 research, but there are few studies on the damage level assessment of buildings after fires and post-disaster restoration work, and they have reference value. Relevant books and literature are relatively scarce. [0003] "Certification Standards for Building Structures after Fire" (CECS252-2009) is the most widely used and most recognized national recommended standard. However, this standard basically considers the appearance of buildings after disasters. The evaluation standard is highly subjective, and the damage level determined by the appearance is ambiguous, which often depends on people's ...

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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

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