Measurements in Traffic Signal Structure using 3D Image Correlation
Strains in a full-scale highway traffic signal structure was measured in the laboratory environment using non contact optical 3D image correlation/photogrammetry technique. These structures are susceptible to fatigue cracking from the welded connections, primarily due to large secondary out of plane stresses developed in the thin walled tubes under wind induced vibration in service. The measurements were focused in four regions where fatigue cracking has been reported in service, to capture the steep surface strain gradient near the weld toe. The structure was discretely supported at the anchor rod locations and was loaded in the plane containing the arm and the pole. Strains were also measured at discrete locations on the tube wall in the regions of interest using conventional strain gages. 3-D Finite Element Analysis (FEA) of the signal structure model was conducted and the strains obtained from measurements and simulation was compared. Overall, this verification exercise demonstrated mixed results.
3D image correlation Non-contact optical measurements Traffic signal structures Fatigue cracking
Sougata Roy Yeun Chul Park Richard Sause Stephen P. Pessiki Tim Schmidt
ATLSS Center, Lehigh University, 117 ATLSS DR, Bethlehem, PA 18015, USA Trilion Quality Systems, 110-448<th> Avenue, Richmond Hill, NY 11418, USA
国际会议
南京
英文
100-108
2007-10-16（万方平台首次上网日期，不代表论文的发表时间）