薄壁截面柱压曲变形的投影云纹法研究

Moire Fringe Method for Measuring Buckling of Thin-Walled Channel Column

本研究用投影云纹法对较大的建筑构件模型——冷弯槽型薄壁截面柱——局部挠曲和整体弯曲变形的全过程进行了实时测量,获得了随着荷载增加槽型薄壁截面柱腹板局部挠曲和整体弯曲变形的等高云纹图.将该等高云纹图输入计算机图象处理系统,实现了图象、数据处理自动化,迅速准确地得到了柱子腹板全场离面位移值,并绘出了试件变形挠曲线及压曲后的变形立体图.

Through measuring the local buckling and the overall bending deformation for the specimen of thin-walled channel column by means of Moire Fringe Method,a number of moire contour patterns of the tested specimen with increasing loading are obtained. And then inputting the moire contour patterns into the picture processing system of the computer,the picture and data processing have been realized,from which the nodal displacements of the web plate of the thin-walled channel column can rapidly and exactly be obtained in fullfield,and the buckling curves and the stereogram of the tested specimen can be drawn.