A Method for Analyzing Earthquake Damage of Buildings

Abstract

The invention discloses a building seismic damage analysis method, and relates to the field of seismic damage assessment. The method comprises the following steps of: setting a contour sampling interval, extracting a point cloud set of different height of a building, then, obtaining a contour section profile line through a convex hull algorithm, and converting three-dimensional point cloud of the building into a two-dimensional contour polygon sequence; extracting shape discrete parameters of the building; and calculating standard deviation of building shape parameters, and through a Fisher discriminant analysis, performing statistics on the standard deviation obtained in a step S22 or a step S23, thereby obtaining a discrimination function corresponding to three types of degree of damage of the building. According to the invention, edge extraction, shape clustering and discriminant analysis are fused, and problems in building contour polygon sequence extraction, shape discrete parameter calculation, irregular building block segmentation and damage analysis are solved effectively.

Description

technical field [0001] The invention relates to the field of earthquake disaster assessment, in particular to a building earthquake damage analysis method. Background technique [0002] With the continuous development of space technology and computer technology, different types of remote sensing data, such as optical images, radar images, etc., are applied to the evaluation and analysis of building damage. Compared with the traditional earthquake damage site investigation, remote sensing earthquake damage assessment has the characteristics of fast, efficient, and safe, but it also has the following shortcomings: (1) Traditional remote sensing images are based on two-dimensional planes, and only record information on the top and a small amount of side surfaces of buildings , which cannot truly reflect its damage state; (2) Most of the analysis objects are not buildings, but grids or irregular planes; (3) The remote sensing earthquake damage classification and grading standard...

AI Technical Summary

Problems solved by technology

Compared with the traditional earthquake damage site investigation, remote sensing earthquake damage assessment has the characteristics of fast, efficient, and safe, but it also has the following shortcomings: (1) Traditional remote sensing images are based on two-dimensional planes, and only record information on the top and a small amount of side surfaces of buildings , which cannot truly reflect its damage state; (2) Most of the analysis objects are not buildings, but grids or irregular planes; (3) The classification and grading standards of remote sensing earthquake damage are not consistent with those of field surveys, and the degree of mutual verification and reference is low

At present, the on-site investigation of buildings in the earthquake area is mostly based on the qualitative judgment of the investigators’ professional knowledge and experience. The data results are mainly text and pictures, which are difficult to use in follow-up scientific research.

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