基于三维数字图像相关法的焊接空心球节点的力学性能试验研究  

Experimental Study on the Mechanical Properties of Welded Hollow Spherical Joints Based on Three-Dimension Digital Image Correlation Method

作　　者：刘红波 杨文婷[1] 杜鹏 陈志华 LIU Hongbo;YANG Wenting;DU Peng;CHEN Zhihua(School of Civil Engineering,Hebei University of Engineering,Handan 056038,China;School of Civil Engineering,Tianjin University,Tianjin 300072,China;Key Laboratory of Coast Civil Structure Safety of Ministry of Education,Tianjin University,Tianjin 300072,China)

机构地区：[1]河北工程大学土木工程学院,河北邯郸056038 [2]天津大学建筑工程学院,天津300072 [3]天津大学滨海土木工程结构与安全教育部重点实验室,天津300072

出　　处：《建筑钢结构进展》2023年第6期35-42,共8页Progress in Steel Building Structures

基　　金：河北省杰出青年基金(E2021402006)。

摘　　要：为了克服传统接触式测量难以获取完整位移及应变场的分布与发展的弊端,探索了采用三维数字图像相关法(3D-DIC)跟踪焊接空心球节点位移和应变的分布与发展的可行性与可靠性。使用三维数字图像相关法观测一个焊接空心球受压损伤节点和一个焊接空心球受拉损伤节点的轴心抗压试验的压缩过程,获得两个试件在试验过程中的位移场与应变场,揭示了焊接空心球节点的受力特点和失效机理,并将观测的位移场和应变场与宏观试验现象进行了比较。试验表明:三维数字图像相关法可以测量加载过程中焊接空心球节点的位移场和应变场的变化规律,并且与宏观试验现象吻合较好。由此证明了三维数字图像相关法可应用于大型焊接球节点的力学性能试验研究的可靠性。In order to overcome the shortcoming of traditional contact measurement that it is difficult to obtain the complete distribution and development of displacement and strain field,this paper explores the use of three-dimension digital image correlation(3D-DIC)method to track the distribution and development of displacement and strain in welded hollow spherical joint.The compression process of a welded hollow spherical joint under compression and a welded hollow spherical joint under tension was recorded by using three-dimension digital image correlation method.The displacement and strain fields of the two specimens were obtained during the test process,and the mechanical properties and failure mechanism of welded hollow spherical joint are studied.The observed displacement field and stress field are compared with macroscopic experimental phenomena.The experimental results show that the threedimensional digital image correlation method can measure the displacement field and strain field of welded hollow spherical joints during loading,and the data is in a good agreement with the macroscopic experimental phenomena.Therefore,three-dimensional digital image correlation method can be effectively applied to the experimental study of mechanical properties of large welded spherical joints.

关 键 词：三维数字图像相关法 焊接空心球节点 轴压试验 位移场 应变场 

分 类 号：TU393.3[建筑科学—结构工程]