A high-speed video measurement method for progressive collapse of reticulated shell structures

Abstract

The invention relates to a high-speed video measurement method for the continuous collapse of a reticulated shell structure, comprising the following steps: 1) setting a plurality of high-speed cameras above the reticulated shell model; 2) performing spherical fitting to obtain the initial three-dimensional of the center of each spherical node Coordinates; 3) Establish a local object space coordinate system, and lay out target point marks corresponding to each spherical node on the reticulated shell; 4) Obtain the initial three-dimensional coordinates of the outer orientation elements of the camera and the target point mark, and establish the target point The spatial relationship between the mark and the center of the node sphere is fixed; 5) Start the reticulated shell breaking device to make the reticulated shell collapse continuously, and the high-speed camera synchronously collects the image data of the reticulated shell collapse; 6) Obtain the target point mark corresponding to the spherical node sphere center Three-dimensional coordinates, obtain the three-dimensional coordinates of the center of the spherical node through coordinate transformation, and finally obtain the three-dimensional time-history displacement of the center of the node. Compared with the prior art, the present invention has the advantages of convenient measurement of spherical center coordinates, non-contact, high precision, high frequency and the like.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a high-speed video measurement method for continuous collapse of reticulated shell structures. Background technique [0002] In the field of civil engineering, the dynamic load measurement task of continuous collapse of structures is a technical problem. In the field of video measurement, many scholars have conducted in-depth research and formed unique measurement schemes. However, their methods can only directly observe the surface points of the structure, but cannot measure the internal points of the structure. [0003] In recent years, photogrammetry technology has been widely used in material testing and structural monitoring, and the resulting video measurement technology can measure the three-dimensional spatial shape changes of target objects in a non-contact method. During the continuous collapse of the reticulated shell, neither the traditional contact sensor nor the co...

AI Technical Summary

Problems solved by technology

During the continuous collapse of the reticulated shell, neither the traditional contact sensor nor the conventional video measurement scheme can measure the internal points of the reticulated shell structure. The reasons are as follows: (1) The spherical nodes will have a large Displacement changes, and the range of the contact displacement meter is limited, which is prone to damage; (2) The contact sensor will increase the weight of the reticulated shell model, which will affect the experimental results; (3) The contact sensor can only measure the displacement of the node surface , but cannot measure the displacement of the center of the node sphere; (4) When the reticulated shell collapses, each node will not only have a vertical displacement but also a horizontal displacement in space, and the displacement meter or accelerometer that can only provide one-way displacement It is simply impossible to accurately measure the spatial displacement results of nodes

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