基于图像相关分析的狗骨式钢框架子结构试验节点区变形场测量

为研究狗骨式钢框架子结构节点区域在循环荷载作用下的损伤演化规律,采用图像相关技术对3榀、3层、单跨1/3缩尺的狗骨式钢框架子结构底层节点区域的应变场及变形进行了监测,重点分析了不同循环加载方式作用下狗骨式节点区域的应变场、节点域剪切变形的历程,并与传统测试方法所记录结果进行了对比。研究结果表明,加载方式对狗骨式钢框架子结构节点区域的变形、应变及其损伤程度均有显著影响;图像相关技术可获得节点区域的变形及应变场,较传统测试方法更具优势;测点峰值应变及变形同传统方法测试结果吻合良好。

On the Deformation Field Measurement of Joint Region on Steel Frame Substructure with RBS Connection Based on Image Correlation Measurement Technology

In order to study the damage evolution in joint region of steel frame substructure with reduced beam section (RBS) connection under cyclic loading condition,the strain field and deformation in bottom joint region were monitored for a 1/3 scale single span substructure specimen with 3 roof trusses and three stories based on the image correlation measurement technology.The strain field and shear deformation in RBS joint region under different cyclic loading patterns was selectively analyzed and compared with the results obtained from traditional measurement method.Results show that the deformation,strain and damage degree in joint region of steel frame substructure with RBS connection are significantly affected by loading mode;Image correlation measurement technology is able to obtain the deformation and strain field in joint region,which is more advantageous than the traditional measurement method;Peak strain and deformation on measuring point are in good agreement with the traditional method.