... DTFH61 -88 -C-00053, University of Colorado, Boulder, CO. Lichtenstein,A.G.(1995). "Bridge Rating Through Nondestructive Load Testing." Technical Report, NCHRP Project 12- 28( 13)A. ... basis. Original development of the hardware was started in 1 988 at the University of Colorado under a contract with the Pennsylvania Department of Transportation (PennDOT). Subsequent to that ... restraints are determined to be present, elastic spring Bài giảng Thí nghiệm cầu - Page 161 of 1 68 38 The only difference between this rating technique and standard beam rating programs is...