Building earthquake damage information detection and extraction method

Abstract

The invention relates to a building earthquake damage information detection and extraction method. The method comprises the following steps of S1, point cloud data preprocessing; S2, performing principal component analysis on the original data of each wall surface of the building after coordinate conversion, calculating a curvature value of wall surface point cloud data, and extracting points of which curvature normal distribution expected values are greater than a threshold value; S3, calculating an adjacent point included angle value of the wall surface point cloud data, performing statistical analysis on distribution characteristics of adjacent point cloud included angle characteristic values of the building wall body crack after the earthquake, and extracting points of which the adjacent point included angle values are greater than a threshold value; S4, performing statistical analysis on the normal vector of the point cloud data to obtain a discrimination threshold corresponding to the building damage area; S5, performing denoising processing on the preliminary extraction result calculated in the step S4 by adopting a density clustering algorithm to obtain a distribution region of the building wall crack point cloud. The three-dimensional laser scanner scans the post-earthquake building to obtain the three-dimensional point cloud data, the earthquake damage information ofthe building is rapidly extracted, and technical support and scientific guarantee can be provided for post-earthquake emergency rescue and loss evaluation.

Description

technical field [0001] The invention relates to a method for detecting and extracting building earthquake damage information, belonging to the technical field of earthquake disaster assessment. Background technique [0002] Earthquake disasters will have a serious impact on people's lives and properties, and the damage to buildings is one of the main reasons for casualties. Rapid damage assessment after an earthquake is critical for emergency response, rescue operations, and post-disaster reconstruction. After a destructive earthquake, the seismic fortification rating of the building structure type plays a crucial role in casualties. The extraction and analysis of earthquake damage information of different structural types of buildings after the earthquake can be used for emergency rescue after the earthquake, assessment of the damage degree of buildings, extraction of deformation characteristics of other structures (bridges, tunnels, dams, etc.) and earthquake resistance o...

AI Technical Summary

Problems solved by technology

The post-earthquake building damage assessment work is time-consuming and heavy-duty. The on-site staff used a ruler to measure the crack information of the building during the investigation process, and there were human errors.

If the wall of the building is slightly inclined and deformed, there are shortcomings that are not easy to be identified during the on-site investigation of the staff, and the information on the deformation of the building is neglected

Buildings with a high degree of damage have the risk of secondary collapse, which poses a greater danger to the personal safety of on-site scientific research staff

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